From 7d7e5455423a3239fd38a651d0f2693c06829755 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Thu, 1 Apr 2021 15:22:01 -0700
Subject: [PATCH] feat(ast-spec): add fixtures

Add fixture tests for each and every AST node.
To make things more readable I:
- separated the AST from the tokens
  - this stops the individual snapshot from being so long it's impossible to understand
  - if there are changes to tokens - then they should be more obvious now. Before you had to expand the snapshot in github to understand that the token was part of the tokens array.
- always write error snapshot, and always write AST/token snapshots
  - This is just for consistency and to make it easier whilst you're developing.
  - It will prevent us from accidentally leaving behind error snapshots if they weren't supposed to be there.
- added a custom snapshot serializer
  - Having learned how useful they are with scope manager - I created a new one to improve the look of the snapshots.
  - Instead of sorting alphabetically, I place `type` at the top, and `range`/`loc` at the end.
  - Instead of outputting `Object` ahead of every node, instead it outputs the node `type`.
  - I adjusted the output `range`/`loc` so they take up fewer lines and are more compact.

I prefixed the snapshot names with numbers just so we can control the sorting of them. No other reason.
---
 .github/workflows/ci.yml                      |   7 +
 .nxignore                                     |   2 +
 .prettierignore                               |   1 +
 .vscode/launch.json                           |  32 +++
 .vscode/settings.json                         |   1 +
 package.json                                  |   3 +
 packages/ast-spec/jest.config.js              |   1 +
 packages/ast-spec/package.json                |  12 +
 packages/ast-spec/src/base/TSHeritageBase.ts  |   1 +
 .../implements-non-identifier/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/_error_/no-body/fixture.ts       |   1 +
 .../no-body/snapshots/1-TSESTree-Error.shot   |   3 +
 .../no-body/snapshots/2-Babel-Error.shot      |   3 +
 .../no-body/snapshots/3-Alignment-Error.shot  |   3 +
 .../_error_/non-identifier-name/fixture.ts    |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/abstract/fixture.ts              |   1 +
 .../abstract/snapshots/1-TSESTree-AST.shot    |  47 ++++
 .../abstract/snapshots/2-TSESTree-Tokens.shot |  56 +++++
 .../abstract/snapshots/3-Babel-AST.shot       |  47 ++++
 .../abstract/snapshots/4-Babel-Tokens.shot    |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/declare/fixture.ts               |   1 +
 .../declare/snapshots/1-TSESTree-AST.shot     |  47 ++++
 .../declare/snapshots/2-TSESTree-Tokens.shot  |  56 +++++
 .../declare/snapshots/3-Babel-AST.shot        |  47 ++++
 .../declare/snapshots/4-Babel-Tokens.shot     |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/decoratorMany/fixture.ts         |   3 +
 .../snapshots/1-TSESTree-AST.shot             |  86 +++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  86 +++++++
 .../decoratorMany/snapshots/3-Babel-AST.shot  |  86 +++++++
 .../snapshots/4-Babel-Tokens.shot             |  86 +++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/decoratorOne/fixture.ts          |   2 +
 .../snapshots/1-TSESTree-AST.shot             |  67 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../decoratorOne/snapshots/3-Babel-AST.shot   |  67 +++++
 .../snapshots/4-Babel-Tokens.shot             |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/empty/fixture.ts                 |   1 +
 .../empty/snapshots/1-TSESTree-AST.shot       |  46 ++++
 .../empty/snapshots/2-TSESTree-Tokens.shot    |  46 ++++
 .../fixtures/empty/snapshots/3-Babel-AST.shot |  46 ++++
 .../empty/snapshots/4-Babel-Tokens.shot       |  46 ++++
 .../empty/snapshots/5-AST-Alignment-AST.shot  |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/extends-literal/README.md        |   1 +
 .../fixtures/extends-literal/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  56 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../snapshots/3-Babel-AST.shot                |  56 +++++
 .../snapshots/4-Babel-Tokens.shot             |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../extends-type-parameters/fixture.ts        |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  75 ++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  96 ++++++++
 .../snapshots/3-Babel-AST.shot                |  75 ++++++
 .../snapshots/4-Babel-Tokens.shot             |  96 ++++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/extends/fixture.ts               |   1 +
 .../extends/snapshots/1-TSESTree-AST.shot     |  55 +++++
 .../extends/snapshots/2-TSESTree-Tokens.shot  |  66 +++++
 .../extends/snapshots/3-Babel-AST.shot        |  55 +++++
 .../extends/snapshots/4-Babel-Tokens.shot     |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/implements-many/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-AST.shot             | 105 ++++++++
 .../snapshots/2-TSESTree-Tokens.shot          | 106 ++++++++
 .../snapshots/3-Babel-AST.shot                | 105 ++++++++
 .../snapshots/4-Babel-Tokens.shot             | 106 ++++++++
 .../snapshots/5-AST-Alignment-AST.shot        | 115 +++++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     | 112 +++++++++
 .../fixtures/implements-one/fixture.ts        |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  67 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../implements-one/snapshots/3-Babel-AST.shot |  67 +++++
 .../snapshots/4-Babel-Tokens.shot             |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |  73 ++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |  72 ++++++
 .../fixture.ts                                |   1 +
 .../snapshots/1-TSESTree-AST.shot             | 115 +++++++++
 .../snapshots/2-TSESTree-Tokens.shot          | 126 ++++++++++
 .../snapshots/3-Babel-AST.shot                | 106 ++++++++
 .../snapshots/4-Babel-Tokens.shot             | 126 ++++++++++
 .../snapshots/5-AST-Alignment-AST.shot        | 120 +++++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/type-parameters/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  76 ++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  76 ++++++
 .../snapshots/3-Babel-AST.shot                |  67 +++++
 .../snapshots/4-Babel-Tokens.shot             |  76 ++++++
 .../snapshots/5-AST-Alignment-AST.shot        |  81 ++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../_error_/named-non-identifier/fixture.ts   |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/_error_/no-source/fixture.ts     |   1 +
 .../no-source/snapshots/1-TSESTree-Error.shot |   3 +
 .../no-source/snapshots/2-Babel-Error.shot    |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/non-string-source/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/_error_/type-kind/fixture.ts     |   1 +
 .../type-kind/snapshots/1-TSESTree-Error.shot |   3 +
 .../type-kind/snapshots/2-Babel-Error.shot    |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/named/fixture.ts                 |   1 +
 .../named/snapshots/1-TSESTree-AST.shot       |  47 ++++
 .../named/snapshots/2-TSESTree-Tokens.shot    |  76 ++++++
 .../fixtures/named/snapshots/3-Babel-AST.shot |  47 ++++
 .../named/snapshots/4-Babel-Tokens.shot       |  76 ++++++
 .../named/snapshots/5-AST-Alignment-AST.shot  |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/unnamed/fixture.ts               |   1 +
 .../unnamed/snapshots/1-TSESTree-AST.shot     |  38 +++
 .../unnamed/snapshots/2-TSESTree-Tokens.shot  |  56 +++++
 .../unnamed/snapshots/3-Babel-AST.shot        |  38 +++
 .../unnamed/snapshots/4-Babel-Tokens.shot     |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/_error_/enum/fixture.ts          |   1 +
 .../enum/snapshots/1-TSESTree-Error.shot      |   3 +
 .../_error_/enum/snapshots/2-Babel-Error.shot |   3 +
 .../enum/snapshots/3-Alignment-Error.shot     |   3 +
 .../fixtures/_error_/namespace/fixture.ts     |   1 +
 .../namespace/snapshots/1-TSESTree-Error.shot |   3 +
 .../namespace/snapshots/2-Babel-Error.shot    |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/_error_/type-alias/fixture.ts    |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../type-alias/snapshots/2-Babel-Error.shot   |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/variable-declaration/fixture.ts   |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/anonymous-class/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  47 ++++
 .../snapshots/2-TSESTree-Tokens.shot          |  56 +++++
 .../snapshots/3-Babel-AST.shot                |  47 ++++
 .../snapshots/4-Babel-Tokens.shot             |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/anonymous-function/fixture.ts    |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  50 ++++
 .../snapshots/2-TSESTree-Tokens.shot          |  76 ++++++
 .../snapshots/3-Babel-AST.shot                |  50 ++++
 .../snapshots/4-Babel-Tokens.shot             |  76 ++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../arrow-function-expression/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  50 ++++
 .../snapshots/2-TSESTree-Tokens.shot          |  86 +++++++
 .../snapshots/3-Babel-AST.shot                |  50 ++++
 .../snapshots/4-Babel-Tokens.shot             |  86 +++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/class-expression/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  56 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  96 ++++++++
 .../snapshots/3-Babel-AST.shot                |  56 +++++
 .../snapshots/4-Babel-Tokens.shot             |  96 ++++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/class/fixture.ts                 |   1 +
 .../class/snapshots/1-TSESTree-AST.shot       |  56 +++++
 .../class/snapshots/2-TSESTree-Tokens.shot    |  66 +++++
 .../fixtures/class/snapshots/3-Babel-AST.shot |  56 +++++
 .../class/snapshots/4-Babel-Tokens.shot       |  66 +++++
 .../class/snapshots/5-AST-Alignment-AST.shot  |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/function/fixture.ts              |   1 +
 .../function/snapshots/1-TSESTree-AST.shot    |  59 +++++
 .../function/snapshots/2-TSESTree-Tokens.shot |  86 +++++++
 .../function/snapshots/3-Babel-AST.shot       |  59 +++++
 .../function/snapshots/4-Babel-Tokens.shot    |  86 +++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/identifier/fixture.ts            |   1 +
 .../identifier/snapshots/1-TSESTree-AST.shot  |  36 +++
 .../snapshots/2-TSESTree-Tokens.shot          |  46 ++++
 .../identifier/snapshots/3-Babel-AST.shot     |  36 +++
 .../identifier/snapshots/4-Babel-Tokens.shot  |  46 ++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/interface/fixture.ts             |   1 +
 .../interface/snapshots/1-TSESTree-AST.shot   |  55 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../interface/snapshots/3-Babel-AST.shot      |  55 +++++
 .../interface/snapshots/4-Babel-Tokens.shot   |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |  72 ++++++
 .../fixtures/literal/fixture.ts               |   1 +
 .../literal/snapshots/1-TSESTree-AST.shot     |  37 +++
 .../literal/snapshots/2-TSESTree-Tokens.shot  |  46 ++++
 .../literal/snapshots/3-Babel-AST.shot        |  37 +++
 .../literal/snapshots/4-Babel-Tokens.shot     |  46 ++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../ExportDefaultDeclaration/spec.ts          |   6 +-
 .../_error_/aliased-literal/fixture.ts        |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/anonymous-class/fixture.ts        |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../anonymous-function-expression/fixture.ts  |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/arrow-function/fixture.ts         |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/class-expression/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/identifier-direct/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/literal-braced/fixture.ts         |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   6 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../_error_/literal-direct/fixture.ts         |   1 +
 .../snapshots/1-TSESTree-Error.shot           |   3 +
 .../snapshots/2-Babel-Error.shot              |   3 +
 .../snapshots/3-Alignment-Error.shot          |   3 +
 .../fixtures/aliased/fixture.ts               |   1 +
 .../aliased/snapshots/1-TSESTree-AST.shot     |  59 +++++
 .../aliased/snapshots/2-TSESTree-Tokens.shot  |  76 ++++++
 .../aliased/snapshots/3-Babel-AST.shot        |  59 +++++
 .../aliased/snapshots/4-Babel-Tokens.shot     |  76 ++++++
 .../snapshots/5-AST-Alignment-AST.shot        |  64 +++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/class/fixture.ts                 |   1 +
 .../class/snapshots/1-TSESTree-AST.shot       |  58 +++++
 .../class/snapshots/2-TSESTree-Tokens.shot    |  56 +++++
 .../fixtures/class/snapshots/3-Babel-AST.shot |  58 +++++
 .../class/snapshots/4-Babel-Tokens.shot       |  56 +++++
 .../class/snapshots/5-AST-Alignment-AST.shot  |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/declare-function/fixture.ts      |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  70 ++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  96 ++++++++
 .../snapshots/3-Babel-AST.shot                |  70 ++++++
 .../snapshots/4-Babel-Tokens.shot             |  96 ++++++++
 .../snapshots/5-AST-Alignment-AST.shot        |  75 ++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/enum/fixture.ts                  |   1 +
 .../enum/snapshots/1-TSESTree-AST.shot        |  48 ++++
 .../enum/snapshots/2-TSESTree-Tokens.shot     |  56 +++++
 .../fixtures/enum/snapshots/3-Babel-AST.shot  |  48 ++++
 .../enum/snapshots/4-Babel-Tokens.shot        |  56 +++++
 .../enum/snapshots/5-AST-Alignment-AST.shot   |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |  62 +++++
 .../fixtures/function-declaration/fixture.ts  |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  61 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  76 ++++++
 .../snapshots/3-Babel-AST.shot                |  61 +++++
 .../snapshots/4-Babel-Tokens.shot             |  76 ++++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/identifier-braced/fixture.ts     |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  59 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  56 +++++
 .../snapshots/3-Babel-AST.shot                |  59 +++++
 .../snapshots/4-Babel-Tokens.shot             |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |  64 +++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/identifier-many/fixture.ts       |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  88 +++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  76 ++++++
 .../snapshots/3-Babel-AST.shot                |  88 +++++++
 .../snapshots/4-Babel-Tokens.shot             |  76 ++++++
 .../snapshots/5-AST-Alignment-AST.shot        |  93 +++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/interface/fixture.ts             |   1 +
 .../interface/snapshots/1-TSESTree-AST.shot   |  57 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  56 +++++
 .../interface/snapshots/3-Babel-AST.shot      |  57 +++++
 .../interface/snapshots/4-Babel-Tokens.shot   |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |  62 +++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |  62 +++++
 .../fixtures/namespace/fixture.ts             |   1 +
 .../namespace/snapshots/1-TSESTree-AST.shot   |  57 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  56 +++++
 .../namespace/snapshots/3-Babel-AST.shot      |  57 +++++
 .../namespace/snapshots/4-Babel-Tokens.shot   |  56 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/type-alias/fixture.ts            |   1 +
 .../type-alias/snapshots/1-TSESTree-AST.shot  |  67 +++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../type-alias/snapshots/3-Babel-AST.shot     |  67 +++++
 .../type-alias/snapshots/4-Babel-Tokens.shot  |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |  72 ++++++
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../fixtures/variable-declaration/fixture.ts  |   1 +
 .../snapshots/1-TSESTree-AST.shot             |  70 ++++++
 .../snapshots/2-TSESTree-Tokens.shot          |  66 +++++
 .../snapshots/3-Babel-AST.shot                |  70 ++++++
 .../snapshots/4-Babel-Tokens.shot             |  66 +++++
 .../snapshots/5-AST-Alignment-AST.shot        |   6 +
 .../snapshots/6-AST-Alignment-Tokens.shot     |   6 +
 .../ExportNamedDeclaration/spec.ts            |   1 +
 ....ts => PunctuatorTokenToText.type-test.ts} |   0
 ...es.test.ts => ast-node-types.type-test.ts} |   0
 .../tests/fixtures-with-differences-ast.shot  |  16 ++
 .../fixtures-with-differences-errors.shot     |  15 ++
 .../fixtures-with-differences-tokens.shot     |  11 +
 packages/ast-spec/tests/fixtures.test.ts      | 230 ++++++++++++++++++
 packages/ast-spec/tests/util/parsers/babel.ts |  49 ++++
 .../tests/util/parsers/parser-types.ts        |  33 +++
 .../tests/util/parsers/typescript-estree.ts   |  33 +++
 .../ast-spec/tests/util/serializers/Node.ts   |  83 +++++++
 .../ast-spec/tests/util/serializers/index.ts  |   6 +
 .../ast-spec/tests/util/serializers/string.ts |  38 +++
 packages/ast-spec/tests/util/setupJest.ts     |   8 +
 packages/ast-spec/tests/util/snapshot-diff.ts |  65 +++++
 .../tests/util/typescript-estree-import.ts    |  17 ++
 packages/ast-spec/tsconfig.build.json         |   3 +-
 packages/ast-spec/tsconfig.json               |   4 +-
 .../ast-spec/typings/babel-eslint-parser.d.ts |  24 ++
 packages/scope-manager/package.json           |   1 +
 packages/scope-manager/tests/fixtures.test.ts |   2 +-
 packages/types/tools/copy-ast-spec.ts         |  40 ++-
 .../visitor-keys/tests/visitor-keys.test.ts   |   5 +
 yarn.lock                                     |  93 +++----
 349 files changed, 11463 insertions(+), 52 deletions(-)
 create mode 100644 .nxignore
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/README.md
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/1-TSESTree-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/2-Babel-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/3-Alignment-Error.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/6-AST-Alignment-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/fixture.ts
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/1-TSESTree-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/2-TSESTree-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/3-Babel-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/4-Babel-Tokens.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/5-AST-Alignment-AST.shot
 create mode 100644 packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/6-AST-Alignment-Tokens.shot
 rename packages/ast-spec/tests/{PunctuatorTokenToText.test.ts => PunctuatorTokenToText.type-test.ts} (100%)
 rename packages/ast-spec/tests/{ast-node-types.test.ts => ast-node-types.type-test.ts} (100%)
 create mode 100644 packages/ast-spec/tests/fixtures-with-differences-ast.shot
 create mode 100644 packages/ast-spec/tests/fixtures-with-differences-errors.shot
 create mode 100644 packages/ast-spec/tests/fixtures-with-differences-tokens.shot
 create mode 100644 packages/ast-spec/tests/fixtures.test.ts
 create mode 100644 packages/ast-spec/tests/util/parsers/babel.ts
 create mode 100644 packages/ast-spec/tests/util/parsers/parser-types.ts
 create mode 100644 packages/ast-spec/tests/util/parsers/typescript-estree.ts
 create mode 100644 packages/ast-spec/tests/util/serializers/Node.ts
 create mode 100644 packages/ast-spec/tests/util/serializers/index.ts
 create mode 100644 packages/ast-spec/tests/util/serializers/string.ts
 create mode 100644 packages/ast-spec/tests/util/setupJest.ts
 create mode 100644 packages/ast-spec/tests/util/snapshot-diff.ts
 create mode 100644 packages/ast-spec/tests/util/typescript-estree-import.ts
 create mode 100644 packages/ast-spec/typings/babel-eslint-parser.d.ts

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5acbec2c9c7..cc3fff820c9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -94,6 +94,12 @@ jobs:
         run: |
           yarn build
 
+      - name: Run unit tests for ast-spec
+        run: yarn test
+        working-directory: packages/ast-spec
+        env:
+          CI: true
+
       - name: Run unit tests for typescript-estree
         run: npx nx test @typescript-eslint/typescript-estree
         env:
@@ -292,6 +298,7 @@ jobs:
         env:
           CI: true
 
+      # ast-spec is internal only - so don't care about compat on other versions
       # eslint-plugin-internal is internal only - so don't care about compat on other versions
 
   publish_canary_version:
diff --git a/.nxignore b/.nxignore
new file mode 100644
index 00000000000..8f084f13c12
--- /dev/null
+++ b/.nxignore
@@ -0,0 +1,2 @@
+# See the notes in the file for why this is needed
+packages/ast-spec/tests/util/typescript-estree-import.ts
diff --git a/.prettierignore b/.prettierignore
index 8212dba92be..54a6250a62c 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -12,6 +12,7 @@ packages/eslint-plugin-tslint/tests/test-tslint-rules-directory/alwaysFailRule.j
 packages/eslint-plugin/src/configs/*.json
 .all-contributorsrc
 CONTRIBUTORS.md
+packages/ast-spec/src/*/*/fixtures/_error_/*/fixture.ts
 
 # Ignore CHANGELOG.md files to avoid issues with automated release job
 CHANGELOG.md
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 5ad1e226457..0f3f02d6324 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -196,5 +196,37 @@
         "${workspaceFolder}/packages/scope-manager/dist/index.js",
       ],
     },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Run currently opened ast-spec test",
+      "cwd": "${workspaceFolder}/packages/ast-spec/",
+      "program": "${workspaceFolder}/node_modules/jest/bin/jest.js",
+      "args": [
+        "--runInBand",
+        "--no-cache",
+        "--no-coverage",
+        "${fileBasename}"
+      ],
+      "sourceMaps": true,
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen",
+      "skipFiles": [
+        "${workspaceFolder}/packages/experimental-utils/src/index.ts",
+        "${workspaceFolder}/packages/experimental-utils/dist/index.js",
+        "${workspaceFolder}/packages/experimental-utils/src/ts-estree.ts",
+        "${workspaceFolder}/packages/experimental-utils/dist/ts-estree.js",
+        "${workspaceFolder}/packages/parser/src/index.ts",
+        "${workspaceFolder}/packages/parser/dist/index.js",
+        "${workspaceFolder}/packages/typescript-estree/src/index.ts",
+        "${workspaceFolder}/packages/typescript-estree/dist/index.js",
+        "${workspaceFolder}/packages/types/src/index.ts",
+        "${workspaceFolder}/packages/types/dist/index.js",
+        "${workspaceFolder}/packages/visitor-keys/src/index.ts",
+        "${workspaceFolder}/packages/visitor-keys/dist/index.js",
+        "${workspaceFolder}/packages/scope-manager/dist/index.js",
+        "${workspaceFolder}/packages/scope-manager/dist/index.js",
+      ],
+    },
   ]
 }
diff --git a/.vscode/settings.json b/.vscode/settings.json
index f0677068d03..a1fbaa7ddc1 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -31,6 +31,7 @@
             ".tsx.shot",
             ".js.shot",
             ".jsx.shot",
+            ".shot",
         ],
         "extends": "jest_snapshot"
     },
diff --git a/package.json b/package.json
index 9a570185529..cde0645affe 100644
--- a/package.json
+++ b/package.json
@@ -72,6 +72,7 @@
   },
   "devDependencies": {
     "@babel/code-frame": "^7.14.5",
+    "@babel/eslint-parser": "^7.15.4",
     "@babel/parser": "^7.15.7",
     "@babel/types": "^7.15.6",
     "@commitlint/cli": "^13.1.0",
@@ -109,6 +110,8 @@
     "glob": "^7.1.7",
     "husky": "^7.0.4",
     "jest": "^27.3.1",
+    "jest-diff": "^27.3.1",
+    "jest-snapshot": "^27.3.1",
     "jest-specific-snapshot": "^5.0.0",
     "lerna": "^3.22.1",
     "lint-staged": "^11.1.2",
diff --git a/packages/ast-spec/jest.config.js b/packages/ast-spec/jest.config.js
index c23ca67fbc6..7de4ca2259c 100644
--- a/packages/ast-spec/jest.config.js
+++ b/packages/ast-spec/jest.config.js
@@ -17,4 +17,5 @@ module.exports = {
   collectCoverageFrom: ['src/**/*.{js,jsx,ts,tsx}'],
   moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
   coverageReporters: ['text-summary', 'lcov'],
+  setupFilesAfterEnv: ['./tests/util/setupJest.ts'],
 };
diff --git a/packages/ast-spec/package.json b/packages/ast-spec/package.json
index dad8afb2e9d..363693e4509 100644
--- a/packages/ast-spec/package.json
+++ b/packages/ast-spec/package.json
@@ -32,8 +32,10 @@
     "build": "tsc -b tsconfig.build.json && api-extractor run --local",
     "clean": "tsc -b tsconfig.build.json --clean",
     "postclean": "rimraf dist && rimraf _ts3.4 && rimraf .rollup.cache && rimraf coverage",
+    "clean-fixtures": "rimraf -g \"./src/**/fixtures/**/snapshots\"",
     "format": "prettier --write \"./**/*.{ts,js,json,md}\" --ignore-path ../../.prettierignore",
     "lint": "eslint . --ext .js,.ts --ignore-path='../../.eslintignore'",
+    "test": "jest",
     "typecheck": "tsc -p tsconfig.json --noEmit"
   },
   "funding": {
@@ -41,7 +43,17 @@
     "url": "https://opencollective.com/typescript-eslint"
   },
   "devDependencies": {
+    "@babel/core": "*",
+    "@babel/eslint-parser": "*",
+    "@babel/parser": "*",
     "@microsoft/api-extractor": "^7.18.16",
+    "@types/babel__core": "*",
+    "glob": "*",
+    "jest-diff": "*",
+    "jest-snapshot": "*",
+    "jest-specific-snapshot": "*",
+    "make-dir": "*",
+    "pretty-format": "*",
     "typescript": "*"
   }
 }
diff --git a/packages/ast-spec/src/base/TSHeritageBase.ts b/packages/ast-spec/src/base/TSHeritageBase.ts
index b3ed1770b67..5c20542e4f9 100644
--- a/packages/ast-spec/src/base/TSHeritageBase.ts
+++ b/packages/ast-spec/src/base/TSHeritageBase.ts
@@ -3,6 +3,7 @@ import type { Expression } from '../unions/Expression';
 import type { BaseNode } from './BaseNode';
 
 export interface TSHeritageBase extends BaseNode {
+  // TODO(error handling) - this should be restricted to MemberExpression | Identifier
   expression: Expression;
   typeParameters?: TSTypeParameterInstantiation;
 }
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/fixture.ts
new file mode 100644
index 00000000000..d9bb750ada2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/fixture.ts
@@ -0,0 +1 @@
+class Foo implements 'thing' {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..d4b25d3584b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ implements-non-identifier TSESTree - Error 1`] = `"NO ERROR"`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..32918ff7c5f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ implements-non-identifier Babel - Error 1`] = `[SyntaxError: Unexpected token (1:21)]`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..123225a1825
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ implements-non-identifier Error Alignment 1`] = `"Babel errored but TSESTree didn't"`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/fixture.ts
new file mode 100644
index 00000000000..12cf01a79ca
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/fixture.ts
@@ -0,0 +1 @@
+class Foo;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..30525843580
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ no-body TSESTree - Error 1`] = `[TSError: '{' expected.]`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..e72c371e842
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ no-body Babel - Error 1`] = `[SyntaxError: Unexpected token, expected "{" (1:9)]`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..b6946023222
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/no-body/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ no-body Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/fixture.ts
new file mode 100644
index 00000000000..140ca7e5d56
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/fixture.ts
@@ -0,0 +1 @@
+class 'Foo' {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..7b137a8c5de
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ non-identifier-name TSESTree - Error 1`] = `[TSError: '{' expected.]`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..e3a40451c7e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ non-identifier-name Babel - Error 1`] = `[SyntaxError: A class name is required. (1:6)]`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..098ed5e7a14
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/_error_/non-identifier-name/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration _error_ non-identifier-name Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/fixture.ts
new file mode 100644
index 00000000000..57d09b35b4c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/fixture.ts
@@ -0,0 +1 @@
+abstract class Foo {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..bae3f5a8287
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      abstract: true,
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [19, 21],
+        loc: {
+          start: { column: 19, line: 1 },
+          end: { column: 21, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [15, 18],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 21],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 21, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 22],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..0cda2312006
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract TSESTree - Tokens 1`] = `
+Array [
+  Identifier {
+    type: "Identifier",
+    value: "abstract",
+
+    range: [0, 8],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [9, 14],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [15, 18],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [20, 21],
+    loc: {
+      start: { column: 20, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..d8e3d045b84
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/3-Babel-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      abstract: true,
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [19, 21],
+        loc: {
+          start: { column: 19, line: 1 },
+          end: { column: 21, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [15, 18],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 21],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 21, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 22],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..ac5930044d1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract Babel - Tokens 1`] = `
+Array [
+  Identifier {
+    type: "Identifier",
+    value: "abstract",
+
+    range: [0, 8],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [9, 14],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [15, 18],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [20, 21],
+    loc: {
+      start: { column: 20, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..54a7219ce9a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..248c67fcb6a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/abstract/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration abstract AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/fixture.ts
new file mode 100644
index 00000000000..a12e8045e83
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/fixture.ts
@@ -0,0 +1 @@
+declare class Foo {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..d20ffd3e130
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [18, 20],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 20, line: 1 },
+        },
+      },
+      declare: true,
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [14, 17],
+        loc: {
+          start: { column: 14, line: 1 },
+          end: { column: 17, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 20],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 20, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 21],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..4006c278dcb
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare TSESTree - Tokens 1`] = `
+Array [
+  Identifier {
+    type: "Identifier",
+    value: "declare",
+
+    range: [0, 7],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 7, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [8, 13],
+    loc: {
+      start: { column: 8, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [14, 17],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..27ac3a41954
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/3-Babel-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [18, 20],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 20, line: 1 },
+        },
+      },
+      declare: true,
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [14, 17],
+        loc: {
+          start: { column: 14, line: 1 },
+          end: { column: 17, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 20],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 20, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 21],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..0fbe7f7fe38
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare Babel - Tokens 1`] = `
+Array [
+  Identifier {
+    type: "Identifier",
+    value: "declare",
+
+    range: [0, 7],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 7, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [8, 13],
+    loc: {
+      start: { column: 8, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [14, 17],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..9fbaa86d5a2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..1bb1eef41ab
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/declare/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration declare AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/fixture.ts
new file mode 100644
index 00000000000..259743a73f7
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/fixture.ts
@@ -0,0 +1,3 @@
+@decoratorOne
+@decoratorTwo
+class Foo {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..ab7726fcd52
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [38, 40],
+        loc: {
+          start: { column: 10, line: 3 },
+          end: { column: 12, line: 3 },
+        },
+      },
+      decorators: Array [
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decoratorOne",
+
+            range: [1, 13],
+            loc: {
+              start: { column: 1, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+
+          range: [0, 13],
+          loc: {
+            start: { column: 0, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decoratorTwo",
+
+            range: [15, 27],
+            loc: {
+              start: { column: 1, line: 2 },
+              end: { column: 13, line: 2 },
+            },
+          },
+
+          range: [14, 27],
+          loc: {
+            start: { column: 0, line: 2 },
+            end: { column: 13, line: 2 },
+          },
+        },
+      ],
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [34, 37],
+        loc: {
+          start: { column: 6, line: 3 },
+          end: { column: 9, line: 3 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 40],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 3 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 41],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 4 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..f406c812335
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany TSESTree - Tokens 1`] = `
+Array [
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [0, 1],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 1, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decoratorOne",
+
+    range: [1, 13],
+    loc: {
+      start: { column: 1, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 0, line: 2 },
+      end: { column: 1, line: 2 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decoratorTwo",
+
+    range: [15, 27],
+    loc: {
+      start: { column: 1, line: 2 },
+      end: { column: 13, line: 2 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [28, 33],
+    loc: {
+      start: { column: 0, line: 3 },
+      end: { column: 5, line: 3 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [34, 37],
+    loc: {
+      start: { column: 6, line: 3 },
+      end: { column: 9, line: 3 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [38, 39],
+    loc: {
+      start: { column: 10, line: 3 },
+      end: { column: 11, line: 3 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [39, 40],
+    loc: {
+      start: { column: 11, line: 3 },
+      end: { column: 12, line: 3 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..60af58e326d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/3-Babel-AST.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [38, 40],
+        loc: {
+          start: { column: 10, line: 3 },
+          end: { column: 12, line: 3 },
+        },
+      },
+      decorators: Array [
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decoratorOne",
+
+            range: [1, 13],
+            loc: {
+              start: { column: 1, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+
+          range: [0, 13],
+          loc: {
+            start: { column: 0, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decoratorTwo",
+
+            range: [15, 27],
+            loc: {
+              start: { column: 1, line: 2 },
+              end: { column: 13, line: 2 },
+            },
+          },
+
+          range: [14, 27],
+          loc: {
+            start: { column: 0, line: 2 },
+            end: { column: 13, line: 2 },
+          },
+        },
+      ],
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [34, 37],
+        loc: {
+          start: { column: 6, line: 3 },
+          end: { column: 9, line: 3 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 40],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 3 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 41],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 4 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..888d2f213d3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany Babel - Tokens 1`] = `
+Array [
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [0, 1],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 1, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decoratorOne",
+
+    range: [1, 13],
+    loc: {
+      start: { column: 1, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 0, line: 2 },
+      end: { column: 1, line: 2 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decoratorTwo",
+
+    range: [15, 27],
+    loc: {
+      start: { column: 1, line: 2 },
+      end: { column: 13, line: 2 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [28, 33],
+    loc: {
+      start: { column: 0, line: 3 },
+      end: { column: 5, line: 3 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [34, 37],
+    loc: {
+      start: { column: 6, line: 3 },
+      end: { column: 9, line: 3 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [38, 39],
+    loc: {
+      start: { column: 10, line: 3 },
+      end: { column: 11, line: 3 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [39, 40],
+    loc: {
+      start: { column: 11, line: 3 },
+      end: { column: 12, line: 3 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..97881c1404c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..e57e9fa7313
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorMany/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorMany AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/fixture.ts
new file mode 100644
index 00000000000..3db0178e0a4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/fixture.ts
@@ -0,0 +1,2 @@
+@decorator
+class Foo {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..f0550dcabbe
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [21, 23],
+        loc: {
+          start: { column: 10, line: 2 },
+          end: { column: 12, line: 2 },
+        },
+      },
+      decorators: Array [
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decorator",
+
+            range: [1, 10],
+            loc: {
+              start: { column: 1, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [0, 10],
+          loc: {
+            start: { column: 0, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+      ],
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [17, 20],
+        loc: {
+          start: { column: 6, line: 2 },
+          end: { column: 9, line: 2 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 2 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 3 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..7354a4e9bfe
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne TSESTree - Tokens 1`] = `
+Array [
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [0, 1],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 1, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decorator",
+
+    range: [1, 10],
+    loc: {
+      start: { column: 1, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [11, 16],
+    loc: {
+      start: { column: 0, line: 2 },
+      end: { column: 5, line: 2 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 6, line: 2 },
+      end: { column: 9, line: 2 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 10, line: 2 },
+      end: { column: 11, line: 2 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 11, line: 2 },
+      end: { column: 12, line: 2 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..f2e4581ba58
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/3-Babel-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [21, 23],
+        loc: {
+          start: { column: 10, line: 2 },
+          end: { column: 12, line: 2 },
+        },
+      },
+      decorators: Array [
+        Decorator {
+          type: "Decorator",
+          expression: Identifier {
+            type: "Identifier",
+            name: "decorator",
+
+            range: [1, 10],
+            loc: {
+              start: { column: 1, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [0, 10],
+          loc: {
+            start: { column: 0, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+      ],
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [17, 20],
+        loc: {
+          start: { column: 6, line: 2 },
+          end: { column: 9, line: 2 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 2 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 3 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..eb1816cba73
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne Babel - Tokens 1`] = `
+Array [
+  Punctuator {
+    type: "Punctuator",
+    value: "@",
+
+    range: [0, 1],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 1, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "decorator",
+
+    range: [1, 10],
+    loc: {
+      start: { column: 1, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [11, 16],
+    loc: {
+      start: { column: 0, line: 2 },
+      end: { column: 5, line: 2 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 6, line: 2 },
+      end: { column: 9, line: 2 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 10, line: 2 },
+      end: { column: 11, line: 2 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 11, line: 2 },
+      end: { column: 12, line: 2 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..19b8f62ee26
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..915fd1d51f9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/decoratorOne/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration decoratorOne AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/fixture.ts
new file mode 100644
index 00000000000..4e6a6de6531
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/fixture.ts
@@ -0,0 +1 @@
+class Foo {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..9ead7d30ab7
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [10, 12],
+        loc: {
+          start: { column: 10, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 12],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 13],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..98e26f81f22
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..b44e7f980bf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/3-Babel-AST.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [10, 12],
+        loc: {
+          start: { column: 10, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: null,
+
+      range: [0, 12],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 12, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 13],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..7687be9ddb0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..795e34e032c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..bf9e1cf5e60
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/empty/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration empty AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/README.md b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/README.md
new file mode 100644
index 00000000000..2e811c1316f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/README.md
@@ -0,0 +1 @@
+This is dumb code - but it's 100% syntactically valid and adheres to the ESTree spec.
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/fixture.ts
new file mode 100644
index 00000000000..7bb36dc0067
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/fixture.ts
@@ -0,0 +1 @@
+class Foo extends 'Thing' {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..dc5437192e6
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [26, 28],
+        loc: {
+          start: { column: 26, line: 1 },
+          end: { column: 28, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Literal {
+        type: "Literal",
+        raw: "'Thing'",
+        value: "Thing",
+
+        range: [18, 25],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 25, line: 1 },
+        },
+      },
+
+      range: [0, 28],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 28, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 29],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..578f3c6a864
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'Thing'",
+
+    range: [18, 25],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..0a84daeb896
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/3-Babel-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [26, 28],
+        loc: {
+          start: { column: 26, line: 1 },
+          end: { column: 28, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Literal {
+        type: "Literal",
+        raw: "'Thing'",
+        value: "Thing",
+
+        range: [18, 25],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 25, line: 1 },
+        },
+      },
+
+      range: [0, 28],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 28, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 29],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..ec6443288fb
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'Thing'",
+
+    range: [18, 25],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..432a1483eb4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..5c213302190
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-literal/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-literal AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/fixture.ts
new file mode 100644
index 00000000000..5d0bc8ed7c7
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/fixture.ts
@@ -0,0 +1 @@
+class Foo extends Set<string> {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..da9fc3ba5ca
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,75 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [30, 32],
+        loc: {
+          start: { column: 30, line: 1 },
+          end: { column: 32, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Set",
+
+        range: [18, 21],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 21, line: 1 },
+        },
+      },
+      superTypeParameters: TSTypeParameterInstantiation {
+        type: "TSTypeParameterInstantiation",
+        params: Array [
+          TSStringKeyword {
+            type: "TSStringKeyword",
+
+            range: [22, 28],
+            loc: {
+              start: { column: 22, line: 1 },
+              end: { column: 28, line: 1 },
+            },
+          },
+        ],
+
+        range: [21, 29],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+
+      range: [0, 32],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 32, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 33],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..3eb2b515a24
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Set",
+
+    range: [18, 21],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "string",
+
+    range: [22, 28],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [31, 32],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 32, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..8f9634b6629
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/3-Babel-AST.shot
@@ -0,0 +1,75 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [30, 32],
+        loc: {
+          start: { column: 30, line: 1 },
+          end: { column: 32, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Set",
+
+        range: [18, 21],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 21, line: 1 },
+        },
+      },
+      superTypeParameters: TSTypeParameterInstantiation {
+        type: "TSTypeParameterInstantiation",
+        params: Array [
+          TSStringKeyword {
+            type: "TSStringKeyword",
+
+            range: [22, 28],
+            loc: {
+              start: { column: 22, line: 1 },
+              end: { column: 28, line: 1 },
+            },
+          },
+        ],
+
+        range: [21, 29],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+
+      range: [0, 32],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 32, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 33],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..db93259e13a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Set",
+
+    range: [18, 21],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "string",
+
+    range: [22, 28],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [31, 32],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 32, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..17f60ddc36a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..8c6277e35df
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends-type-parameters AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/fixture.ts
new file mode 100644
index 00000000000..1f5fd8cad4e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/fixture.ts
@@ -0,0 +1 @@
+class Foo extends Object {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..d8241f2f4d5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,55 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [25, 27],
+        loc: {
+          start: { column: 25, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Object",
+
+        range: [18, 24],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+
+      range: [0, 27],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 28],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..1a912d35116
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [18, 24],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..337d09683e9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/3-Babel-AST.shot
@@ -0,0 +1,55 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [25, 27],
+        loc: {
+          start: { column: 25, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Object",
+
+        range: [18, 24],
+        loc: {
+          start: { column: 18, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+
+      range: [0, 27],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 28],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..2f17f69fe6b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [10, 17],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [18, 24],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..7408520a611
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..ff9ee33e186
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/extends/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration extends AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/fixture.ts
new file mode 100644
index 00000000000..c0cae9a1115
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/fixture.ts
@@ -0,0 +1 @@
+class Foo implements Object, Function, RegExp {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..6467e4a37f0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,105 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [46, 48],
+        loc: {
+          start: { column: 46, line: 1 },
+          end: { column: 48, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      implements: Array [
+        TSClassImplements {
+          type: "TSClassImplements",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Object",
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+
+          range: [21, 27],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        TSClassImplements {
+          type: "TSClassImplements",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Function",
+
+            range: [29, 37],
+            loc: {
+              start: { column: 29, line: 1 },
+              end: { column: 37, line: 1 },
+            },
+          },
+
+          range: [29, 37],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 37, line: 1 },
+          },
+        },
+        TSClassImplements {
+          type: "TSClassImplements",
+          expression: Identifier {
+            type: "Identifier",
+            name: "RegExp",
+
+            range: [39, 45],
+            loc: {
+              start: { column: 39, line: 1 },
+              end: { column: 45, line: 1 },
+            },
+          },
+
+          range: [39, 45],
+          loc: {
+            start: { column: 39, line: 1 },
+            end: { column: 45, line: 1 },
+          },
+        },
+      ],
+      superClass: null,
+
+      range: [0, 48],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 48, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 49],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..ffe359159d4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,106 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "implements",
+
+    range: [10, 20],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [21, 27],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Function",
+
+    range: [29, 37],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 37, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [37, 38],
+    loc: {
+      start: { column: 37, line: 1 },
+      end: { column: 38, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "RegExp",
+
+    range: [39, 45],
+    loc: {
+      start: { column: 39, line: 1 },
+      end: { column: 45, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [46, 47],
+    loc: {
+      start: { column: 46, line: 1 },
+      end: { column: 47, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [47, 48],
+    loc: {
+      start: { column: 47, line: 1 },
+      end: { column: 48, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..c5a75e6d5b1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/3-Babel-AST.shot
@@ -0,0 +1,105 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [46, 48],
+        loc: {
+          start: { column: 46, line: 1 },
+          end: { column: 48, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      implements: Array [
+        TSExpressionWithTypeArguments {
+          type: "TSExpressionWithTypeArguments",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Object",
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+
+          range: [21, 27],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        TSExpressionWithTypeArguments {
+          type: "TSExpressionWithTypeArguments",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Function",
+
+            range: [29, 37],
+            loc: {
+              start: { column: 29, line: 1 },
+              end: { column: 37, line: 1 },
+            },
+          },
+
+          range: [29, 37],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 37, line: 1 },
+          },
+        },
+        TSExpressionWithTypeArguments {
+          type: "TSExpressionWithTypeArguments",
+          expression: Identifier {
+            type: "Identifier",
+            name: "RegExp",
+
+            range: [39, 45],
+            loc: {
+              start: { column: 39, line: 1 },
+              end: { column: 45, line: 1 },
+            },
+          },
+
+          range: [39, 45],
+          loc: {
+            start: { column: 39, line: 1 },
+            end: { column: 45, line: 1 },
+          },
+        },
+      ],
+      superClass: null,
+
+      range: [0, 48],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 48, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 49],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..ca4cb279c00
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,106 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "implements",
+
+    range: [10, 20],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [21, 27],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Function",
+
+    range: [29, 37],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 37, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [37, 38],
+    loc: {
+      start: { column: 37, line: 1 },
+      end: { column: 38, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "RegExp",
+
+    range: [39, 45],
+    loc: {
+      start: { column: 39, line: 1 },
+      end: { column: 45, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [46, 47],
+    loc: {
+      start: { column: 46, line: 1 },
+      end: { column: 47, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [47, 48],
+    loc: {
+      start: { column: 47, line: 1 },
+      end: { column: 48, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..77b0476655c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,115 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ClassDeclaration {
+        type: 'ClassDeclaration',
+        body: ClassBody {
+          type: 'ClassBody',
+          body: Array [],
+
+          range: [46, 48],
+          loc: {
+            start: { column: 46, line: 1 },
+            end: { column: 48, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: 'Identifier',
+          name: 'Foo',
+
+          range: [6, 9],
+          loc: {
+            start: { column: 6, line: 1 },
+            end: { column: 9, line: 1 },
+          },
+        },
+        implements: Array [
+-         TSClassImplements {
+-           type: 'TSClassImplements',
++         TSExpressionWithTypeArguments {
++           type: 'TSExpressionWithTypeArguments',
+            expression: Identifier {
+              type: 'Identifier',
+              name: 'Object',
+
+              range: [21, 27],
+              loc: {
+                start: { column: 21, line: 1 },
+                end: { column: 27, line: 1 },
+              },
+            },
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+-         TSClassImplements {
+-           type: 'TSClassImplements',
++         TSExpressionWithTypeArguments {
++           type: 'TSExpressionWithTypeArguments',
+            expression: Identifier {
+              type: 'Identifier',
+              name: 'Function',
+
+              range: [29, 37],
+              loc: {
+                start: { column: 29, line: 1 },
+                end: { column: 37, line: 1 },
+              },
+            },
+
+            range: [29, 37],
+            loc: {
+              start: { column: 29, line: 1 },
+              end: { column: 37, line: 1 },
+            },
+          },
+-         TSClassImplements {
+-           type: 'TSClassImplements',
++         TSExpressionWithTypeArguments {
++           type: 'TSExpressionWithTypeArguments',
+            expression: Identifier {
+              type: 'Identifier',
+              name: 'RegExp',
+
+              range: [39, 45],
+              loc: {
+                start: { column: 39, line: 1 },
+                end: { column: 45, line: 1 },
+              },
+            },
+
+            range: [39, 45],
+            loc: {
+              start: { column: 39, line: 1 },
+              end: { column: 45, line: 1 },
+            },
+          },
+        ],
+        superClass: null,
+
+        range: [0, 48],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 48, line: 1 },
+        },
+      },
+    ],
+    sourceType: 'script',
+
+    range: [0, 49],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..931998b9e18
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-many/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,112 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-many AST Alignment - Token 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Array [
+    Keyword {
+      type: 'Keyword',
+      value: 'class',
+
+      range: [0, 5],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 5, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Foo',
+
+      range: [6, 9],
+      loc: {
+        start: { column: 6, line: 1 },
+        end: { column: 9, line: 1 },
+      },
+    },
+-   Keyword {
+-     type: 'Keyword',
++   Identifier {
++     type: 'Identifier',
+      value: 'implements',
+
+      range: [10, 20],
+      loc: {
+        start: { column: 10, line: 1 },
+        end: { column: 20, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Object',
+
+      range: [21, 27],
+      loc: {
+        start: { column: 21, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: ',',
+
+      range: [27, 28],
+      loc: {
+        start: { column: 27, line: 1 },
+        end: { column: 28, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Function',
+
+      range: [29, 37],
+      loc: {
+        start: { column: 29, line: 1 },
+        end: { column: 37, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: ',',
+
+      range: [37, 38],
+      loc: {
+        start: { column: 37, line: 1 },
+        end: { column: 38, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'RegExp',
+
+      range: [39, 45],
+      loc: {
+        start: { column: 39, line: 1 },
+        end: { column: 45, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '{',
+
+      range: [46, 47],
+      loc: {
+        start: { column: 46, line: 1 },
+        end: { column: 47, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '}',
+
+      range: [47, 48],
+      loc: {
+        start: { column: 47, line: 1 },
+        end: { column: 48, line: 1 },
+      },
+    },
+  ]"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/fixture.ts
new file mode 100644
index 00000000000..2e21f7b7833
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/fixture.ts
@@ -0,0 +1 @@
+class Foo implements Object {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..c5228690b09
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [28, 30],
+        loc: {
+          start: { column: 28, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      implements: Array [
+        TSClassImplements {
+          type: "TSClassImplements",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Object",
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+
+          range: [21, 27],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+      ],
+      superClass: null,
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..160a01b3a57
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "implements",
+
+    range: [10, 20],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [21, 27],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..de05a724a09
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/3-Babel-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [28, 30],
+        loc: {
+          start: { column: 28, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      implements: Array [
+        TSExpressionWithTypeArguments {
+          type: "TSExpressionWithTypeArguments",
+          expression: Identifier {
+            type: "Identifier",
+            name: "Object",
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+
+          range: [21, 27],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+      ],
+      superClass: null,
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..07fe25e0f65
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "implements",
+
+    range: [10, 20],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Object",
+
+    range: [21, 27],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..b0aec089f61
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,73 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ClassDeclaration {
+        type: 'ClassDeclaration',
+        body: ClassBody {
+          type: 'ClassBody',
+          body: Array [],
+
+          range: [28, 30],
+          loc: {
+            start: { column: 28, line: 1 },
+            end: { column: 30, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: 'Identifier',
+          name: 'Foo',
+
+          range: [6, 9],
+          loc: {
+            start: { column: 6, line: 1 },
+            end: { column: 9, line: 1 },
+          },
+        },
+        implements: Array [
+-         TSClassImplements {
+-           type: 'TSClassImplements',
++         TSExpressionWithTypeArguments {
++           type: 'TSExpressionWithTypeArguments',
+            expression: Identifier {
+              type: 'Identifier',
+              name: 'Object',
+
+              range: [21, 27],
+              loc: {
+                start: { column: 21, line: 1 },
+                end: { column: 27, line: 1 },
+              },
+            },
+
+            range: [21, 27],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+        ],
+        superClass: null,
+
+        range: [0, 30],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+    ],
+    sourceType: 'script',
+
+    range: [0, 31],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..0d56c0d096e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/implements-one/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,72 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration implements-one AST Alignment - Token 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Array [
+    Keyword {
+      type: 'Keyword',
+      value: 'class',
+
+      range: [0, 5],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 5, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Foo',
+
+      range: [6, 9],
+      loc: {
+        start: { column: 6, line: 1 },
+        end: { column: 9, line: 1 },
+      },
+    },
+-   Keyword {
+-     type: 'Keyword',
++   Identifier {
++     type: 'Identifier',
+      value: 'implements',
+
+      range: [10, 20],
+      loc: {
+        start: { column: 10, line: 1 },
+        end: { column: 20, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Object',
+
+      range: [21, 27],
+      loc: {
+        start: { column: 21, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '{',
+
+      range: [28, 29],
+      loc: {
+        start: { column: 28, line: 1 },
+        end: { column: 29, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '}',
+
+      range: [29, 30],
+      loc: {
+        start: { column: 29, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ]"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/fixture.ts
new file mode 100644
index 00000000000..9a3d334adee
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/fixture.ts
@@ -0,0 +1 @@
+class Foo<T> extends Set<T> {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..7fa28228017
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,115 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [28, 30],
+        loc: {
+          start: { column: 28, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Set",
+
+        range: [21, 24],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+      superTypeParameters: TSTypeParameterInstantiation {
+        type: "TSTypeParameterInstantiation",
+        params: Array [
+          TSTypeReference {
+            type: "TSTypeReference",
+            typeName: Identifier {
+              type: "Identifier",
+              name: "T",
+
+              range: [25, 26],
+              loc: {
+                start: { column: 25, line: 1 },
+                end: { column: 26, line: 1 },
+              },
+            },
+
+            range: [25, 26],
+            loc: {
+              start: { column: 25, line: 1 },
+              end: { column: 26, line: 1 },
+            },
+          },
+        ],
+
+        range: [24, 27],
+        loc: {
+          start: { column: 24, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      typeParameters: TSTypeParameterDeclaration {
+        type: "TSTypeParameterDeclaration",
+        params: Array [
+          TSTypeParameter {
+            type: "TSTypeParameter",
+            name: Identifier {
+              type: "Identifier",
+              name: "T",
+
+              range: [10, 11],
+              loc: {
+                start: { column: 10, line: 1 },
+                end: { column: 11, line: 1 },
+              },
+            },
+
+            range: [10, 11],
+            loc: {
+              start: { column: 10, line: 1 },
+              end: { column: 11, line: 1 },
+            },
+          },
+        ],
+
+        range: [9, 12],
+        loc: {
+          start: { column: 9, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..f73a167dba3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,126 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [13, 20],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Set",
+
+    range: [21, 24],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [24, 25],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..7c5a5149bbe
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/3-Babel-AST.shot
@@ -0,0 +1,106 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [28, 30],
+        loc: {
+          start: { column: 28, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: Identifier {
+        type: "Identifier",
+        name: "Set",
+
+        range: [21, 24],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+      superTypeParameters: TSTypeParameterInstantiation {
+        type: "TSTypeParameterInstantiation",
+        params: Array [
+          TSTypeReference {
+            type: "TSTypeReference",
+            typeName: Identifier {
+              type: "Identifier",
+              name: "T",
+
+              range: [25, 26],
+              loc: {
+                start: { column: 25, line: 1 },
+                end: { column: 26, line: 1 },
+              },
+            },
+
+            range: [25, 26],
+            loc: {
+              start: { column: 25, line: 1 },
+              end: { column: 26, line: 1 },
+            },
+          },
+        ],
+
+        range: [24, 27],
+        loc: {
+          start: { column: 24, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      typeParameters: TSTypeParameterDeclaration {
+        type: "TSTypeParameterDeclaration",
+        params: Array [
+          TSTypeParameter {
+            type: "TSTypeParameter",
+            name: "T",
+
+            range: [10, 11],
+            loc: {
+              start: { column: 10, line: 1 },
+              end: { column: 11, line: 1 },
+            },
+          },
+        ],
+
+        range: [9, 12],
+        loc: {
+          start: { column: 9, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..17ca652dc4a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,126 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "extends",
+
+    range: [13, 20],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Set",
+
+    range: [21, 24],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [24, 25],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..70cae74b300
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,120 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ClassDeclaration {
+        type: 'ClassDeclaration',
+        body: ClassBody {
+          type: 'ClassBody',
+          body: Array [],
+
+          range: [28, 30],
+          loc: {
+            start: { column: 28, line: 1 },
+            end: { column: 30, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: 'Identifier',
+          name: 'Foo',
+
+          range: [6, 9],
+          loc: {
+            start: { column: 6, line: 1 },
+            end: { column: 9, line: 1 },
+          },
+        },
+        superClass: Identifier {
+          type: 'Identifier',
+          name: 'Set',
+
+          range: [21, 24],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 24, line: 1 },
+          },
+        },
+        superTypeParameters: TSTypeParameterInstantiation {
+          type: 'TSTypeParameterInstantiation',
+          params: Array [
+            TSTypeReference {
+              type: 'TSTypeReference',
+              typeName: Identifier {
+                type: 'Identifier',
+                name: 'T',
+
+                range: [25, 26],
+                loc: {
+                  start: { column: 25, line: 1 },
+                  end: { column: 26, line: 1 },
+                },
+              },
+
+              range: [25, 26],
+              loc: {
+                start: { column: 25, line: 1 },
+                end: { column: 26, line: 1 },
+              },
+            },
+          ],
+
+          range: [24, 27],
+          loc: {
+            start: { column: 24, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        typeParameters: TSTypeParameterDeclaration {
+          type: 'TSTypeParameterDeclaration',
+          params: Array [
+            TSTypeParameter {
+              type: 'TSTypeParameter',
+-             name: Identifier {
+-               type: 'Identifier',
+-               name: 'T',
+-
+-               range: [10, 11],
+-               loc: {
+-                 start: { column: 10, line: 1 },
+-                 end: { column: 11, line: 1 },
+-               },
+-             },
++             name: 'T',
+
+              range: [10, 11],
+              loc: {
+                start: { column: 10, line: 1 },
+                end: { column: 11, line: 1 },
+              },
+            },
+          ],
+
+          range: [9, 12],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 12, line: 1 },
+          },
+        },
+
+        range: [0, 30],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 30, line: 1 },
+        },
+      },
+    ],
+    sourceType: 'script',
+
+    range: [0, 31],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..4e5329e739f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters-extends-type-parameters AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/fixture.ts b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/fixture.ts
new file mode 100644
index 00000000000..9f84d173bfa
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/fixture.ts
@@ -0,0 +1 @@
+class Foo<T> {}
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..0b476f5584e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [13, 15],
+        loc: {
+          start: { column: 13, line: 1 },
+          end: { column: 15, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: null,
+      typeParameters: TSTypeParameterDeclaration {
+        type: "TSTypeParameterDeclaration",
+        params: Array [
+          TSTypeParameter {
+            type: "TSTypeParameter",
+            name: Identifier {
+              type: "Identifier",
+              name: "T",
+
+              range: [10, 11],
+              loc: {
+                start: { column: 10, line: 1 },
+                end: { column: 11, line: 1 },
+              },
+            },
+
+            range: [10, 11],
+            loc: {
+              start: { column: 10, line: 1 },
+              end: { column: 11, line: 1 },
+            },
+          },
+        ],
+
+        range: [9, 12],
+        loc: {
+          start: { column: 9, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+
+      range: [0, 15],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 15, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 16],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..7afa2b8839b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [13, 14],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..de9ab22cc6b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/3-Babel-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ClassDeclaration {
+      type: "ClassDeclaration",
+      body: ClassBody {
+        type: "ClassBody",
+        body: Array [],
+
+        range: [13, 15],
+        loc: {
+          start: { column: 13, line: 1 },
+          end: { column: 15, line: 1 },
+        },
+      },
+      id: Identifier {
+        type: "Identifier",
+        name: "Foo",
+
+        range: [6, 9],
+        loc: {
+          start: { column: 6, line: 1 },
+          end: { column: 9, line: 1 },
+        },
+      },
+      superClass: null,
+      typeParameters: TSTypeParameterDeclaration {
+        type: "TSTypeParameterDeclaration",
+        params: Array [
+          TSTypeParameter {
+            type: "TSTypeParameter",
+            name: "T",
+
+            range: [10, 11],
+            loc: {
+              start: { column: 10, line: 1 },
+              end: { column: 11, line: 1 },
+            },
+          },
+        ],
+
+        range: [9, 12],
+        loc: {
+          start: { column: 9, line: 1 },
+          end: { column: 12, line: 1 },
+        },
+      },
+
+      range: [0, 15],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 15, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 16],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..89bca663a6d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [0, 5],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 5, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [6, 9],
+    loc: {
+      start: { column: 6, line: 1 },
+      end: { column: 9, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "<",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "T",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ">",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [13, 14],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..f3b75ecbb25
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,81 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ClassDeclaration {
+        type: 'ClassDeclaration',
+        body: ClassBody {
+          type: 'ClassBody',
+          body: Array [],
+
+          range: [13, 15],
+          loc: {
+            start: { column: 13, line: 1 },
+            end: { column: 15, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: 'Identifier',
+          name: 'Foo',
+
+          range: [6, 9],
+          loc: {
+            start: { column: 6, line: 1 },
+            end: { column: 9, line: 1 },
+          },
+        },
+        superClass: null,
+        typeParameters: TSTypeParameterDeclaration {
+          type: 'TSTypeParameterDeclaration',
+          params: Array [
+            TSTypeParameter {
+              type: 'TSTypeParameter',
+-             name: Identifier {
+-               type: 'Identifier',
+-               name: 'T',
+-
+-               range: [10, 11],
+-               loc: {
+-                 start: { column: 10, line: 1 },
+-                 end: { column: 11, line: 1 },
+-               },
+-             },
++             name: 'T',
+
+              range: [10, 11],
+              loc: {
+                start: { column: 10, line: 1 },
+                end: { column: 11, line: 1 },
+              },
+            },
+          ],
+
+          range: [9, 12],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 12, line: 1 },
+          },
+        },
+
+        range: [0, 15],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 15, line: 1 },
+        },
+      },
+    ],
+    sourceType: 'script',
+
+    range: [0, 16],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..a99d685df3d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ClassDeclaration/fixtures/type-parameters/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ClassDeclaration type-parameters AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/fixture.ts
new file mode 100644
index 00000000000..8bab23b3599
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/fixture.ts
@@ -0,0 +1 @@
+export * as 'foo' from 'module';
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..5f6d97e5f2b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ named-non-identifier TSESTree - Error 1`] = `[TSError: Identifier expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..04ccfb73d5b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ named-non-identifier Babel - Error 1`] = `"NO ERROR"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..3e05e98bfaf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ named-non-identifier Error Alignment 1`] = `"TSESTree errored but Babel didn't"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/fixture.ts
new file mode 100644
index 00000000000..b5299226ad4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/fixture.ts
@@ -0,0 +1 @@
+export * from;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..acdaf4c735f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ no-source TSESTree - Error 1`] = `[TSError: Expression expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..8bd09ace8dc
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ no-source Babel - Error 1`] = `[SyntaxError: Unexpected token (1:13)]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..c2ac962baac
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/no-source/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ no-source Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/fixture.ts
new file mode 100644
index 00000000000..d78b6918cb1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/fixture.ts
@@ -0,0 +1 @@
+export * from module;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..bcf5b40695c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ non-string-source TSESTree - Error 1`] = `[TSError: Module specifier must be a string literal.]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..a3d08a7b52a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ non-string-source Babel - Error 1`] = `[SyntaxError: Unexpected token (1:14)]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..3a1a419a831
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/non-string-source/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ non-string-source Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/fixture.ts
new file mode 100644
index 00000000000..35e627e28c5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/fixture.ts
@@ -0,0 +1 @@
+export type * from 'a';
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..a9b2c20c7fa
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ type-kind TSESTree - Error 1`] = `"NO ERROR"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..e448d4b4299
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ type-kind Babel - Error 1`] = `[SyntaxError: Unexpected token (1:12)]`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..e9c5efb6898
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/_error_/type-kind/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration _error_ type-kind Error Alignment 1`] = `"Babel errored but TSESTree didn't"`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/fixture.ts
new file mode 100644
index 00000000000..fca392829b8
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/fixture.ts
@@ -0,0 +1 @@
+export * as mod from 'module';
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..d144a119f89
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportAllDeclaration {
+      type: "ExportAllDeclaration",
+      exported: Identifier {
+        type: "Identifier",
+        name: "mod",
+
+        range: [12, 15],
+        loc: {
+          start: { column: 12, line: 1 },
+          end: { column: 15, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: Literal {
+        type: "Literal",
+        raw: "'module'",
+        value: "module",
+
+        range: [21, 29],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..7fc2d67baba
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "*",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "as",
+
+    range: [9, 11],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "mod",
+
+    range: [12, 15],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "from",
+
+    range: [16, 20],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'module'",
+
+    range: [21, 29],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..cfda133b218
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/3-Babel-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportAllDeclaration {
+      type: "ExportAllDeclaration",
+      exported: Identifier {
+        type: "Identifier",
+        name: "mod",
+
+        range: [12, 15],
+        loc: {
+          start: { column: 12, line: 1 },
+          end: { column: 15, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: Literal {
+        type: "Literal",
+        raw: "'module'",
+        value: "module",
+
+        range: [21, 29],
+        loc: {
+          start: { column: 21, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..66f249ee6ca
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "*",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "as",
+
+    range: [9, 11],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "mod",
+
+    range: [12, 15],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "from",
+
+    range: [16, 20],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'module'",
+
+    range: [21, 29],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..8aabbae3357
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..5020f9f630e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/named/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration named AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/fixture.ts b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/fixture.ts
new file mode 100644
index 00000000000..86a4838f7b9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/fixture.ts
@@ -0,0 +1 @@
+export * from 'my-module';
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..34d728556ef
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,38 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportAllDeclaration {
+      type: "ExportAllDeclaration",
+      exported: null,
+      exportKind: "value",
+      source: Literal {
+        type: "Literal",
+        raw: "'my-module'",
+        value: "my-module",
+
+        range: [14, 25],
+        loc: {
+          start: { column: 14, line: 1 },
+          end: { column: 25, line: 1 },
+        },
+      },
+
+      range: [0, 26],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 26, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 27],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..29ffb6ae0fe
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "*",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "from",
+
+    range: [9, 13],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'my-module'",
+
+    range: [14, 25],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..286e180a93b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/3-Babel-AST.shot
@@ -0,0 +1,38 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportAllDeclaration {
+      type: "ExportAllDeclaration",
+      exported: null,
+      exportKind: "value",
+      source: Literal {
+        type: "Literal",
+        raw: "'my-module'",
+        value: "my-module",
+
+        range: [14, 25],
+        loc: {
+          start: { column: 14, line: 1 },
+          end: { column: 25, line: 1 },
+        },
+      },
+
+      range: [0, 26],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 26, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 27],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..82327ff3352
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "*",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "from",
+
+    range: [9, 13],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  String {
+    type: "String",
+    value: "'my-module'",
+
+    range: [14, 25],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..351bb72f34f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..e2a55391779
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportAllDeclaration/fixtures/unnamed/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportAllDeclaration unnamed AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/fixture.ts
new file mode 100644
index 00000000000..0386d9255b0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/fixture.ts
@@ -0,0 +1 @@
+export default enum Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..c289052b36c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ enum TSESTree - Error 1`] = `[TSError: Expression expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..987e4dd40c8
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ enum Babel - Error 1`] = `[SyntaxError: Missing semicolon. (1:19)]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..32a1cb0d300
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/enum/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ enum Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/fixture.ts
new file mode 100644
index 00000000000..dcefd115a28
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/fixture.ts
@@ -0,0 +1 @@
+export default namespace Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..d1633569950
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ namespace TSESTree - Error 1`] = `[TSError: ';' expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..a80c3233614
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ namespace Babel - Error 1`] = `[SyntaxError: Missing semicolon. (1:24)]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..7ecaa9bcded
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/namespace/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ namespace Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/fixture.ts
new file mode 100644
index 00000000000..81b83c5de98
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/fixture.ts
@@ -0,0 +1 @@
+export default type Foo = 1;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..bce2c7cd5ee
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ type-alias TSESTree - Error 1`] = `[TSError: ';' expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..6afc67d4a5b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ type-alias Babel - Error 1`] = `[SyntaxError: Missing semicolon. (1:19)]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..9f4c01a0337
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/type-alias/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ type-alias Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/fixture.ts
new file mode 100644
index 00000000000..4b535f12615
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/fixture.ts
@@ -0,0 +1 @@
+export default const x = 1;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..43ab9a3893e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ variable-declaration TSESTree - Error 1`] = `[TSError: Expression expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..318dee3aacf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ variable-declaration Babel - Error 1`] = `[SyntaxError: Only expressions, functions or classes are allowed as the \`default\` export. (1:15)]`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..327cd763562
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/_error_/variable-declaration/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration _error_ variable-declaration Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/fixture.ts
new file mode 100644
index 00000000000..a6e68e98389
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/fixture.ts
@@ -0,0 +1 @@
+export default class {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..bc5b9ffa8c1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: null,
+        superClass: null,
+
+        range: [15, 23],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..9773e0f17a9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [15, 20],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..1262745aead
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/3-Babel-AST.shot
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: null,
+        superClass: null,
+
+        range: [15, 23],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..74d6f62864b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [15, 20],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..6c617458733
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..7ace7535964
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-class/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-class AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/fixture.ts
new file mode 100644
index 00000000000..ea9b101e1c2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/fixture.ts
@@ -0,0 +1 @@
+export default function () {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..e30c973e4c5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,50 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [27, 29],
+          loc: {
+            start: { column: 27, line: 1 },
+            end: { column: 29, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: null,
+        params: Array [],
+
+        range: [15, 29],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 29],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 29, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 30],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..292689734d6
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [24, 25],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..d379b69f6c4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/3-Babel-AST.shot
@@ -0,0 +1,50 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [27, 29],
+          loc: {
+            start: { column: 27, line: 1 },
+            end: { column: 29, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: null,
+        params: Array [],
+
+        range: [15, 29],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 29, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 29],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 29, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 30],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..b52b674b4d5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [24, 25],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..0472fbccb82
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..9b1f36f4e1e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/anonymous-function/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration anonymous-function AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/fixture.ts
new file mode 100644
index 00000000000..2d1ec238274
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/fixture.ts
@@ -0,0 +1 @@
+export default () => {};
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..d4ccafd5b51
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,50 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ArrowFunctionExpression {
+        type: "ArrowFunctionExpression",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: null,
+        params: Array [],
+
+        range: [15, 23],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 24],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 24, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 25],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..b49305998ff
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=>",
+
+    range: [18, 20],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [23, 24],
+    loc: {
+      start: { column: 23, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..85a0d39624f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/3-Babel-AST.shot
@@ -0,0 +1,50 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ArrowFunctionExpression {
+        type: "ArrowFunctionExpression",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: null,
+        params: Array [],
+
+        range: [15, 23],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 24],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 24, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 25],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..fc7a2baf088
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=>",
+
+    range: [18, 20],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [23, 24],
+    loc: {
+      start: { column: 23, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..359c33602be
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..c7f2151c920
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/arrow-function-expression/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration arrow-function-expression AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/fixture.ts
new file mode 100644
index 00000000000..caaf4f896e8
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/fixture.ts
@@ -0,0 +1 @@
+export default (class Foo {});
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..166a1d77c3d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassExpression {
+        type: "ClassExpression",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [26, 28],
+          loc: {
+            start: { column: 26, line: 1 },
+            end: { column: 28, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [22, 25],
+          loc: {
+            start: { column: 22, line: 1 },
+            end: { column: 25, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [16, 28],
+        loc: {
+          start: { column: 16, line: 1 },
+          end: { column: 28, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..4e62aa0dc6a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [16, 21],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [22, 25],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..25ab06d87ef
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/3-Babel-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassExpression {
+        type: "ClassExpression",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [26, 28],
+          loc: {
+            start: { column: 26, line: 1 },
+            end: { column: 28, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [22, 25],
+          loc: {
+            start: { column: 22, line: 1 },
+            end: { column: 25, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [16, 28],
+        loc: {
+          start: { column: 16, line: 1 },
+          end: { column: 28, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 30],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 31],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..4137a875c9f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [16, 21],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [22, 25],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 25, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..4d3dd269c49
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..1328ba27a28
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class-expression/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class-expression AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/fixture.ts
new file mode 100644
index 00000000000..7804111002d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/fixture.ts
@@ -0,0 +1 @@
+export default class Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..f2ce271ea77
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [25, 27],
+          loc: {
+            start: { column: 25, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [21, 24],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 24, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [15, 27],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 27],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 28],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..5703d446ea5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [15, 20],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [21, 24],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..432ded44307
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [25, 27],
+          loc: {
+            start: { column: 25, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [21, 24],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 24, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [15, 27],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 27, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 27],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 27, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 28],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..01f9049584e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [15, 20],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [21, 24],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [25, 26],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 26, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [26, 27],
+    loc: {
+      start: { column: 26, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..892ae8987da
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..96e9c654eee
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration class AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/fixture.ts
new file mode 100644
index 00000000000..386baca1731
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/fixture.ts
@@ -0,0 +1 @@
+export default function foo() {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..59570dbd56d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [30, 32],
+          loc: {
+            start: { column: 30, line: 1 },
+            end: { column: 32, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [24, 27],
+          loc: {
+            start: { column: 24, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        params: Array [],
+
+        range: [15, 32],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 32, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 32],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 32, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 33],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..b3a2cd2b15b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [24, 27],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [31, 32],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 32, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..98b11432232
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/3-Babel-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [30, 32],
+          loc: {
+            start: { column: 30, line: 1 },
+            end: { column: 32, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [24, 27],
+          loc: {
+            start: { column: 24, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        params: Array [],
+
+        range: [15, 32],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 32, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 32],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 32, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 33],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..44f7cd272d3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,86 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [24, 27],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [31, 32],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 32, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..6e67c16fb8b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..b5de7325dea
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/function/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration function AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/fixture.ts
new file mode 100644
index 00000000000..7b56c8b8f39
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/fixture.ts
@@ -0,0 +1 @@
+export default x;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..11900ab6838
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,36 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: Identifier {
+        type: "Identifier",
+        name: "x",
+
+        range: [15, 16],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 16, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 17],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 17, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 18],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..d52ccbb0406
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "x",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..be4bb919b88
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/3-Babel-AST.shot
@@ -0,0 +1,36 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: Identifier {
+        type: "Identifier",
+        name: "x",
+
+        range: [15, 16],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 16, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 17],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 17, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 18],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..e4567a57c93
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "x",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..1fc84e1257d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..fa730c9cc1d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/identifier/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration identifier AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/fixture.ts
new file mode 100644
index 00000000000..4c36019eea2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/fixture.ts
@@ -0,0 +1 @@
+export default interface Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..755e1480fde
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,55 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: TSInterfaceDeclaration {
+        type: "TSInterfaceDeclaration",
+        body: TSInterfaceBody {
+          type: "TSInterfaceBody",
+          body: Array [],
+
+          range: [29, 31],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 31, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [25, 28],
+          loc: {
+            start: { column: 25, line: 1 },
+            end: { column: 28, line: 1 },
+          },
+        },
+
+        range: [15, 31],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 31, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 31],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 31, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 32],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..e528391c3b1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "interface",
+
+    range: [15, 24],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [25, 28],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..2619c1ffa78
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
@@ -0,0 +1,55 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: TSInterfaceDeclaration {
+        type: "TSInterfaceDeclaration",
+        body: TSInterfaceBody {
+          type: "TSInterfaceBody",
+          body: Array [],
+
+          range: [29, 31],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 31, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [25, 28],
+          loc: {
+            start: { column: 25, line: 1 },
+            end: { column: 28, line: 1 },
+          },
+        },
+
+        range: [15, 31],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 31, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 31],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 31, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 32],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..9363ba0a28b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "interface",
+
+    range: [15, 24],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [25, 28],
+    loc: {
+      start: { column: 25, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [30, 31],
+    loc: {
+      start: { column: 30, line: 1 },
+      end: { column: 31, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..778b30b1513
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..e0918e2af4e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,72 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration interface AST Alignment - Token 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Array [
+    Keyword {
+      type: 'Keyword',
+      value: 'export',
+
+      range: [0, 6],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 6, line: 1 },
+      },
+    },
+    Keyword {
+      type: 'Keyword',
+      value: 'default',
+
+      range: [7, 14],
+      loc: {
+        start: { column: 7, line: 1 },
+        end: { column: 14, line: 1 },
+      },
+    },
+-   Keyword {
+-     type: 'Keyword',
++   Identifier {
++     type: 'Identifier',
+      value: 'interface',
+
+      range: [15, 24],
+      loc: {
+        start: { column: 15, line: 1 },
+        end: { column: 24, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Foo',
+
+      range: [25, 28],
+      loc: {
+        start: { column: 25, line: 1 },
+        end: { column: 28, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '{',
+
+      range: [29, 30],
+      loc: {
+        start: { column: 29, line: 1 },
+        end: { column: 30, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '}',
+
+      range: [30, 31],
+      loc: {
+        start: { column: 30, line: 1 },
+        end: { column: 31, line: 1 },
+      },
+    },
+  ]"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/fixture.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/fixture.ts
new file mode 100644
index 00000000000..aef22247d75
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/fixture.ts
@@ -0,0 +1 @@
+export default 1;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..dae455b793b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,37 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: Literal {
+        type: "Literal",
+        raw: "1",
+        value: 1,
+
+        range: [15, 16],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 16, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 17],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 17, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 18],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..48eaeb62600
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..f4c959e63f2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/3-Babel-AST.shot
@@ -0,0 +1,37 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportDefaultDeclaration {
+      type: "ExportDefaultDeclaration",
+      declaration: Literal {
+        type: "Literal",
+        raw: "1",
+        value: 1,
+
+        range: [15, 16],
+        loc: {
+          start: { column: 15, line: 1 },
+          end: { column: 16, line: 1 },
+        },
+      },
+      exportKind: "value",
+
+      range: [0, 17],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 17, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 18],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..209d1dbb63f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "default",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..7715558acb1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..c0a93423d4d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/fixtures/literal/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportDefaultDeclaration literal AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/spec.ts b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/spec.ts
index 492d0981b8c..2cfe1cce5b3 100644
--- a/packages/ast-spec/src/declaration/ExportDefaultDeclaration/spec.ts
+++ b/packages/ast-spec/src/declaration/ExportDefaultDeclaration/spec.ts
@@ -6,6 +6,10 @@ import type { ExportKind } from '../ExportAndImportKind';
 
 export interface ExportDefaultDeclaration extends BaseNode {
   type: AST_NODE_TYPES.ExportDefaultDeclaration;
-  declaration: ExportDeclaration | Expression;
+  declaration:
+    | // TODO(error handling) - the following are disallowed syntactically, but allowed by TS error recovery:
+    // TSEnumDeclaration, TSModuleDeclaration, TSTypeAliasDeclaration, VariableDeclaration
+    ExportDeclaration
+    | Expression;
   exportKind: ExportKind;
 }
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/fixture.ts
new file mode 100644
index 00000000000..5faf31b8867
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/fixture.ts
@@ -0,0 +1 @@
+export { a as 'a' };
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..71841045f6c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ aliased-literal TSESTree - Error 1`] = `[TSError: Identifier expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..dabc7d927d5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ aliased-literal Babel - Error 1`] = `"NO ERROR"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..efb97399842
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ aliased-literal Error Alignment 1`] = `"TSESTree errored but Babel didn't"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/fixture.ts
new file mode 100644
index 00000000000..c433d66cf64
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/fixture.ts
@@ -0,0 +1 @@
+export class {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..4bb37139b1b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-class TSESTree - Error 1`] = `"NO ERROR"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..b3ebe67f29a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-class Babel - Error 1`] = `[SyntaxError: A class name is required. (1:13)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..82e5ade4750
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-class Error Alignment 1`] = `"Babel errored but TSESTree didn't"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/fixture.ts
new file mode 100644
index 00000000000..d9a2010f925
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/fixture.ts
@@ -0,0 +1 @@
+export function () {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..9c89f7d7f37
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-function-expression TSESTree - Error 1`] = `[TSError: Identifier expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..70ef1140faa
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-function-expression Babel - Error 1`] = `[SyntaxError: Unexpected token (1:16)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..15aae2856e1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-function-expression/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ anonymous-function-expression Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/fixture.ts
new file mode 100644
index 00000000000..ec7e7945aaf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/fixture.ts
@@ -0,0 +1 @@
+export () => {};
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..bc1507d797f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ arrow-function TSESTree - Error 1`] = `[TSError: Declaration or statement expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..d3a01941b96
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ arrow-function Babel - Error 1`] = `[SyntaxError: Unexpected token, expected "{" (1:7)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..fd6445ddef3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/arrow-function/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ arrow-function Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/fixture.ts
new file mode 100644
index 00000000000..bb46c3698b9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/fixture.ts
@@ -0,0 +1 @@
+export (class Foo {});
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..af9eba5ac2c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ class-expression TSESTree - Error 1`] = `[TSError: Declaration or statement expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..59d790cb18d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ class-expression Babel - Error 1`] = `[SyntaxError: Unexpected token, expected "{" (1:7)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..dbe6913aab5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/class-expression/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ class-expression Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/fixture.ts
new file mode 100644
index 00000000000..0d3d77ac413
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/fixture.ts
@@ -0,0 +1 @@
+export a;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..302c6c7c652
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ identifier-direct TSESTree - Error 1`] = `[TSError: Declaration or statement expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..968987af209
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ identifier-direct Babel - Error 1`] = `[SyntaxError: Unexpected token, expected "{" (1:7)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..00f60c625f5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/identifier-direct/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ identifier-direct Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/fixture.ts
new file mode 100644
index 00000000000..7eec000d816
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/fixture.ts
@@ -0,0 +1 @@
+export { 'a' };
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..7e7d8c008fc
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-braced TSESTree - Error 1`] = `[TSError: Identifier expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..3ba27489473
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/2-Babel-Error.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-braced Babel - Error 1`] = `
+[SyntaxError: A string literal cannot be used as an exported binding without \`from\`.
+- Did you mean \`export { 'a' as 'a' } from 'some-module'\`? (1:9)]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..f2d4bb40cc5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-braced/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-braced Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/fixture.ts
new file mode 100644
index 00000000000..ed5896524bf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/fixture.ts
@@ -0,0 +1 @@
+export 'a';
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/1-TSESTree-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/1-TSESTree-Error.shot
new file mode 100644
index 00000000000..9e96ac05522
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/1-TSESTree-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-direct TSESTree - Error 1`] = `[TSError: Declaration or statement expected.]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/2-Babel-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/2-Babel-Error.shot
new file mode 100644
index 00000000000..cf5a26409d1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/2-Babel-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-direct Babel - Error 1`] = `[SyntaxError: Unexpected token, expected "{" (1:7)]`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/3-Alignment-Error.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/3-Alignment-Error.shot
new file mode 100644
index 00000000000..7d06f41fc05
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/_error_/literal-direct/snapshots/3-Alignment-Error.shot
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration _error_ literal-direct Error Alignment 1`] = `"Both errored"`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/fixture.ts
new file mode 100644
index 00000000000..060ae5187cf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/fixture.ts
@@ -0,0 +1 @@
+export { a as b };
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..951a52a70f1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [14, 15],
+            loc: {
+              start: { column: 14, line: 1 },
+              end: { column: 15, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 15],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 15, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..24df13756b8
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "as",
+
+    range: [11, 13],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "b",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..82c3dfdcd6a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/3-Babel-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [14, 15],
+            loc: {
+              start: { column: 14, line: 1 },
+              end: { column: 15, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 15],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 15, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..bce9dd071b1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "as",
+
+    range: [11, 13],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "b",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..c47e8452bb0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,64 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: null,
+        exportKind: 'value',
+        source: null,
+        specifiers: Array [
+          ExportSpecifier {
+            type: 'ExportSpecifier',
+            exported: Identifier {
+              type: 'Identifier',
+              name: 'b',
+
+              range: [14, 15],
+              loc: {
+                start: { column: 14, line: 1 },
+                end: { column: 15, line: 1 },
+              },
+            },
+            local: Identifier {
+              type: 'Identifier',
+              name: 'a',
+
+              range: [9, 10],
+              loc: {
+                start: { column: 9, line: 1 },
+                end: { column: 10, line: 1 },
+              },
+            },
+
+            range: [9, 15],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 15, line: 1 },
+            },
+          },
+        ],
+
+        range: [0, 18],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 19],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..ce523723d51
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/aliased/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration aliased AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/fixture.ts
new file mode 100644
index 00000000000..223d0a8b395
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/fixture.ts
@@ -0,0 +1 @@
+export class Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..78ca8f0f95b
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,58 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [17, 19],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 19, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [13, 16],
+          loc: {
+            start: { column: 13, line: 1 },
+            end: { column: 16, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [7, 19],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 19, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 19],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 19, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 20],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..b9218046a08
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [7, 12],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [13, 16],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..7041dd9e2cf
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/3-Babel-AST.shot
@@ -0,0 +1,58 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: ClassDeclaration {
+        type: "ClassDeclaration",
+        body: ClassBody {
+          type: "ClassBody",
+          body: Array [],
+
+          range: [17, 19],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 19, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [13, 16],
+          loc: {
+            start: { column: 13, line: 1 },
+            end: { column: 16, line: 1 },
+          },
+        },
+        superClass: null,
+
+        range: [7, 19],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 19, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 19],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 19, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 20],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..cdfb7afcd34
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "class",
+
+    range: [7, 12],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [13, 16],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..cb90ab5e0fb
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..8f68d87f732
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/class/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration class AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/fixture.ts
new file mode 100644
index 00000000000..b1725174a5e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/fixture.ts
@@ -0,0 +1 @@
+export declare function foo(): void;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..f64e471ca14
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,70 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSDeclareFunction {
+        type: "TSDeclareFunction",
+        async: false,
+        declare: true,
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [24, 27],
+          loc: {
+            start: { column: 24, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        params: Array [],
+        returnType: TSTypeAnnotation {
+          type: "TSTypeAnnotation",
+          typeAnnotation: TSVoidKeyword {
+            type: "TSVoidKeyword",
+
+            range: [31, 35],
+            loc: {
+              start: { column: 31, line: 1 },
+              end: { column: 35, line: 1 },
+            },
+          },
+
+          range: [29, 35],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 35, line: 1 },
+          },
+        },
+
+        range: [7, 36],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 36, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 36],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 36, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 37],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..13073c0479d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "declare",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [24, 27],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ":",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "void",
+
+    range: [31, 35],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 35, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [35, 36],
+    loc: {
+      start: { column: 35, line: 1 },
+      end: { column: 36, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..393d84cb152
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/3-Babel-AST.shot
@@ -0,0 +1,70 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSDeclareFunction {
+        type: "TSDeclareFunction",
+        async: false,
+        declare: true,
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [24, 27],
+          loc: {
+            start: { column: 24, line: 1 },
+            end: { column: 27, line: 1 },
+          },
+        },
+        params: Array [],
+        returnType: TSTypeAnnotation {
+          type: "TSTypeAnnotation",
+          typeAnnotation: TSVoidKeyword {
+            type: "TSVoidKeyword",
+
+            range: [31, 35],
+            loc: {
+              start: { column: 31, line: 1 },
+              end: { column: 35, line: 1 },
+            },
+          },
+
+          range: [29, 35],
+          loc: {
+            start: { column: 29, line: 1 },
+            end: { column: 35, line: 1 },
+          },
+        },
+
+        range: [7, 36],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 36, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 36],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 36, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 37],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..b5ea9d5fbf4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,96 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "declare",
+
+    range: [7, 14],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [15, 23],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [24, 27],
+    loc: {
+      start: { column: 24, line: 1 },
+      end: { column: 27, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [27, 28],
+    loc: {
+      start: { column: 27, line: 1 },
+      end: { column: 28, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [28, 29],
+    loc: {
+      start: { column: 28, line: 1 },
+      end: { column: 29, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ":",
+
+    range: [29, 30],
+    loc: {
+      start: { column: 29, line: 1 },
+      end: { column: 30, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "void",
+
+    range: [31, 35],
+    loc: {
+      start: { column: 31, line: 1 },
+      end: { column: 35, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [35, 36],
+    loc: {
+      start: { column: 35, line: 1 },
+      end: { column: 36, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..747cc98291f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,75 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: TSDeclareFunction {
+          type: 'TSDeclareFunction',
+          async: false,
+          declare: true,
+          expression: false,
+          generator: false,
+          id: Identifier {
+            type: 'Identifier',
+            name: 'foo',
+
+            range: [24, 27],
+            loc: {
+              start: { column: 24, line: 1 },
+              end: { column: 27, line: 1 },
+            },
+          },
+          params: Array [],
+          returnType: TSTypeAnnotation {
+            type: 'TSTypeAnnotation',
+            typeAnnotation: TSVoidKeyword {
+              type: 'TSVoidKeyword',
+
+              range: [31, 35],
+              loc: {
+                start: { column: 31, line: 1 },
+                end: { column: 35, line: 1 },
+              },
+            },
+
+            range: [29, 35],
+            loc: {
+              start: { column: 29, line: 1 },
+              end: { column: 35, line: 1 },
+            },
+          },
+
+          range: [7, 36],
+          loc: {
+            start: { column: 7, line: 1 },
+            end: { column: 36, line: 1 },
+          },
+        },
+        exportKind: 'type',
+        source: null,
+        specifiers: Array [],
+
+        range: [0, 36],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 36, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 37],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..9b1647311bd
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/declare-function/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration declare-function AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/fixture.ts
new file mode 100644
index 00000000000..3705c4fd946
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/fixture.ts
@@ -0,0 +1 @@
+export enum Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..71e411c31b7
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,48 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSEnumDeclaration {
+        type: "TSEnumDeclaration",
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [12, 15],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 15, line: 1 },
+          },
+        },
+        members: Array [],
+
+        range: [7, 18],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..5c6e73d4b25
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "enum",
+
+    range: [7, 11],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [12, 15],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..6dafb943f57
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/3-Babel-AST.shot
@@ -0,0 +1,48 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSEnumDeclaration {
+        type: "TSEnumDeclaration",
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [12, 15],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 15, line: 1 },
+          },
+        },
+        members: Array [],
+
+        range: [7, 18],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..e7ad15b4a50
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "enum",
+
+    range: [7, 11],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [12, 15],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..1a21129afb2
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..2d3cd94a36c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/enum/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,62 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration enum AST Alignment - Token 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Array [
+    Keyword {
+      type: 'Keyword',
+      value: 'export',
+
+      range: [0, 6],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 6, line: 1 },
+      },
+    },
+-   Keyword {
+-     type: 'Keyword',
++   Identifier {
++     type: 'Identifier',
+      value: 'enum',
+
+      range: [7, 11],
+      loc: {
+        start: { column: 7, line: 1 },
+        end: { column: 11, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Foo',
+
+      range: [12, 15],
+      loc: {
+        start: { column: 12, line: 1 },
+        end: { column: 15, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '{',
+
+      range: [16, 17],
+      loc: {
+        start: { column: 16, line: 1 },
+        end: { column: 17, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '}',
+
+      range: [17, 18],
+      loc: {
+        start: { column: 17, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ]"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/fixture.ts
new file mode 100644
index 00000000000..f99d4277774
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/fixture.ts
@@ -0,0 +1 @@
+export function foo() {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..5f75ef24847
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,61 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [22, 24],
+          loc: {
+            start: { column: 22, line: 1 },
+            end: { column: 24, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [16, 19],
+          loc: {
+            start: { column: 16, line: 1 },
+            end: { column: 19, line: 1 },
+          },
+        },
+        params: Array [],
+
+        range: [7, 24],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 24],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 24, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 25],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..c4c9340ff8c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [7, 15],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [16, 19],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [20, 21],
+    loc: {
+      start: { column: 20, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [23, 24],
+    loc: {
+      start: { column: 23, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..f5759a789a3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/3-Babel-AST.shot
@@ -0,0 +1,61 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: FunctionDeclaration {
+        type: "FunctionDeclaration",
+        async: false,
+        body: BlockStatement {
+          type: "BlockStatement",
+          body: Array [],
+
+          range: [22, 24],
+          loc: {
+            start: { column: 22, line: 1 },
+            end: { column: 24, line: 1 },
+          },
+        },
+        expression: false,
+        generator: false,
+        id: Identifier {
+          type: "Identifier",
+          name: "foo",
+
+          range: [16, 19],
+          loc: {
+            start: { column: 16, line: 1 },
+            end: { column: 19, line: 1 },
+          },
+        },
+        params: Array [],
+
+        range: [7, 24],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 24, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 24],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 24, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 25],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..f60ad2056b0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "function",
+
+    range: [7, 15],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "foo",
+
+    range: [16, 19],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "(",
+
+    range: [19, 20],
+    loc: {
+      start: { column: 19, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ")",
+
+    range: [20, 21],
+    loc: {
+      start: { column: 20, line: 1 },
+      end: { column: 21, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [23, 24],
+    loc: {
+      start: { column: 23, line: 1 },
+      end: { column: 24, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..fe318b3ed6f
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..502fe958a40
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/function-declaration/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration function-declaration AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/fixture.ts
new file mode 100644
index 00000000000..7e905f38bf5
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/fixture.ts
@@ -0,0 +1 @@
+export { a };
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..4f74a14c10d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 10],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 13],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 13, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 14],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..471a1862f6c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..d273070078d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/3-Babel-AST.shot
@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 10],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 13],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 13, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 14],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..c01ed8b93a4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [11, 12],
+    loc: {
+      start: { column: 11, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..7c15286e575
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,64 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: null,
+        exportKind: 'value',
+        source: null,
+        specifiers: Array [
+          ExportSpecifier {
+            type: 'ExportSpecifier',
+            exported: Identifier {
+              type: 'Identifier',
+              name: 'a',
+
+              range: [9, 10],
+              loc: {
+                start: { column: 9, line: 1 },
+                end: { column: 10, line: 1 },
+              },
+            },
+            local: Identifier {
+              type: 'Identifier',
+              name: 'a',
+
+              range: [9, 10],
+              loc: {
+                start: { column: 9, line: 1 },
+                end: { column: 10, line: 1 },
+              },
+            },
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+        ],
+
+        range: [0, 13],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 13, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 14],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..d3563662f8c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-braced/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-braced AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/fixture.ts
new file mode 100644
index 00000000000..606432a162a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/fixture.ts
@@ -0,0 +1 @@
+export { a, b };
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..370ae6439e1
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,88 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 10],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+
+          range: [12, 13],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 16],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 16, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 17],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..91bf0e7c2b9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "b",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..2dd893ac711
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/3-Babel-AST.shot
@@ -0,0 +1,88 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: null,
+      exportKind: "value",
+      source: null,
+      specifiers: Array [
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "a",
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+
+          range: [9, 10],
+          loc: {
+            start: { column: 9, line: 1 },
+            end: { column: 10, line: 1 },
+          },
+        },
+        ExportSpecifier {
+          type: "ExportSpecifier",
+          exported: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+          local: Identifier {
+            type: "Identifier",
+            name: "b",
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+
+          range: [12, 13],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+      ],
+
+      range: [0, 16],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 16, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 17],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..f29165c63d0
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,76 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [7, 8],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 8, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "a",
+
+    range: [9, 10],
+    loc: {
+      start: { column: 9, line: 1 },
+      end: { column: 10, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ",",
+
+    range: [10, 11],
+    loc: {
+      start: { column: 10, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "b",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..fd763b3d634
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,93 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: null,
+        exportKind: 'value',
+        source: null,
+        specifiers: Array [
+          ExportSpecifier {
+            type: 'ExportSpecifier',
+            exported: Identifier {
+              type: 'Identifier',
+              name: 'a',
+
+              range: [9, 10],
+              loc: {
+                start: { column: 9, line: 1 },
+                end: { column: 10, line: 1 },
+              },
+            },
+            local: Identifier {
+              type: 'Identifier',
+              name: 'a',
+
+              range: [9, 10],
+              loc: {
+                start: { column: 9, line: 1 },
+                end: { column: 10, line: 1 },
+              },
+            },
+
+            range: [9, 10],
+            loc: {
+              start: { column: 9, line: 1 },
+              end: { column: 10, line: 1 },
+            },
+          },
+          ExportSpecifier {
+            type: 'ExportSpecifier',
+            exported: Identifier {
+              type: 'Identifier',
+              name: 'b',
+
+              range: [12, 13],
+              loc: {
+                start: { column: 12, line: 1 },
+                end: { column: 13, line: 1 },
+              },
+            },
+            local: Identifier {
+              type: 'Identifier',
+              name: 'b',
+
+              range: [12, 13],
+              loc: {
+                start: { column: 12, line: 1 },
+                end: { column: 13, line: 1 },
+              },
+            },
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+        ],
+
+        range: [0, 16],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 16, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 17],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..939b36fc37c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/identifier-many/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration identifier-many AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts
new file mode 100644
index 00000000000..39df3b83f7e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts
@@ -0,0 +1 @@
+export interface Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..a9888863f9c
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,57 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSInterfaceDeclaration {
+        type: "TSInterfaceDeclaration",
+        body: TSInterfaceBody {
+          type: "TSInterfaceBody",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [17, 20],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 20, line: 1 },
+          },
+        },
+
+        range: [7, 23],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..9a0b5ef7598
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "interface",
+
+    range: [7, 16],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..36a4cac831a
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/3-Babel-AST.shot
@@ -0,0 +1,57 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSInterfaceDeclaration {
+        type: "TSInterfaceDeclaration",
+        body: TSInterfaceBody {
+          type: "TSInterfaceBody",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [17, 20],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 20, line: 1 },
+          },
+        },
+
+        range: [7, 23],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..c52d2829e2e
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "interface",
+
+    range: [7, 16],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..119f2651036
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,62 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: TSInterfaceDeclaration {
+          type: 'TSInterfaceDeclaration',
+          body: TSInterfaceBody {
+            type: 'TSInterfaceBody',
+            body: Array [],
+
+            range: [21, 23],
+            loc: {
+              start: { column: 21, line: 1 },
+              end: { column: 23, line: 1 },
+            },
+          },
+          id: Identifier {
+            type: 'Identifier',
+            name: 'Foo',
+
+            range: [17, 20],
+            loc: {
+              start: { column: 17, line: 1 },
+              end: { column: 20, line: 1 },
+            },
+          },
+
+          range: [7, 23],
+          loc: {
+            start: { column: 7, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        exportKind: 'type',
+        source: null,
+        specifiers: Array [],
+
+        range: [0, 23],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 24],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..3bf1141ae94
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/interface/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,62 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration interface AST Alignment - Token 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Array [
+    Keyword {
+      type: 'Keyword',
+      value: 'export',
+
+      range: [0, 6],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 6, line: 1 },
+      },
+    },
+-   Keyword {
+-     type: 'Keyword',
++   Identifier {
++     type: 'Identifier',
+      value: 'interface',
+
+      range: [7, 16],
+      loc: {
+        start: { column: 7, line: 1 },
+        end: { column: 16, line: 1 },
+      },
+    },
+    Identifier {
+      type: 'Identifier',
+      value: 'Foo',
+
+      range: [17, 20],
+      loc: {
+        start: { column: 17, line: 1 },
+        end: { column: 20, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '{',
+
+      range: [21, 22],
+      loc: {
+        start: { column: 21, line: 1 },
+        end: { column: 22, line: 1 },
+      },
+    },
+    Punctuator {
+      type: 'Punctuator',
+      value: '}',
+
+      range: [22, 23],
+      loc: {
+        start: { column: 22, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ]"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/fixture.ts
new file mode 100644
index 00000000000..851030bd028
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/fixture.ts
@@ -0,0 +1 @@
+export namespace Foo {}
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..00a9c9d6270
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,57 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSModuleDeclaration {
+        type: "TSModuleDeclaration",
+        body: TSModuleBlock {
+          type: "TSModuleBlock",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [17, 20],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 20, line: 1 },
+          },
+        },
+
+        range: [7, 23],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..72df88433a4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "namespace",
+
+    range: [7, 16],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..4a726419a21
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/3-Babel-AST.shot
@@ -0,0 +1,57 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSModuleDeclaration {
+        type: "TSModuleDeclaration",
+        body: TSModuleBlock {
+          type: "TSModuleBlock",
+          body: Array [],
+
+          range: [21, 23],
+          loc: {
+            start: { column: 21, line: 1 },
+            end: { column: 23, line: 1 },
+          },
+        },
+        id: Identifier {
+          type: "Identifier",
+          name: "Foo",
+
+          range: [17, 20],
+          loc: {
+            start: { column: 17, line: 1 },
+            end: { column: 20, line: 1 },
+          },
+        },
+
+        range: [7, 23],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 23, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 23],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 23, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 24],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..0a3d1ca1dee
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,56 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "namespace",
+
+    range: [7, 16],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "Foo",
+
+    range: [17, 20],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 20, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "{",
+
+    range: [21, 22],
+    loc: {
+      start: { column: 21, line: 1 },
+      end: { column: 22, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "}",
+
+    range: [22, 23],
+    loc: {
+      start: { column: 22, line: 1 },
+      end: { column: 23, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..00a19c01c58
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..57daa643d18
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/namespace/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration namespace AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/fixture.ts
new file mode 100644
index 00000000000..f29cc6f5296
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/fixture.ts
@@ -0,0 +1 @@
+export type A = 1;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..034591c40b3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSTypeAliasDeclaration {
+        type: "TSTypeAliasDeclaration",
+        id: Identifier {
+          type: "Identifier",
+          name: "A",
+
+          range: [12, 13],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+        typeAnnotation: TSLiteralType {
+          type: "TSLiteralType",
+          literal: Literal {
+            type: "Literal",
+            raw: "1",
+            value: 1,
+
+            range: [16, 17],
+            loc: {
+              start: { column: 16, line: 1 },
+              end: { column: 17, line: 1 },
+            },
+          },
+
+          range: [16, 17],
+          loc: {
+            start: { column: 16, line: 1 },
+            end: { column: 17, line: 1 },
+          },
+        },
+
+        range: [7, 18],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..b7fb84a7c81
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "type",
+
+    range: [7, 11],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "A",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..f46cb4220c3
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/3-Babel-AST.shot
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: TSTypeAliasDeclaration {
+        type: "TSTypeAliasDeclaration",
+        id: Identifier {
+          type: "Identifier",
+          name: "A",
+
+          range: [12, 13],
+          loc: {
+            start: { column: 12, line: 1 },
+            end: { column: 13, line: 1 },
+          },
+        },
+        typeAnnotation: TSLiteralType {
+          type: "TSLiteralType",
+          literal: Literal {
+            type: "Literal",
+            raw: "1",
+            value: 1,
+
+            range: [16, 17],
+            loc: {
+              start: { column: 16, line: 1 },
+              end: { column: 17, line: 1 },
+            },
+          },
+
+          range: [16, 17],
+          loc: {
+            start: { column: 16, line: 1 },
+            end: { column: 17, line: 1 },
+          },
+        },
+
+        range: [7, 18],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+      exportKind: "type",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 18],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 18, line: 1 },
+      },
+    },
+  ],
+  sourceType: "script",
+
+  range: [0, 19],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..597a4d5f2bd
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "type",
+
+    range: [7, 11],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 11, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "A",
+
+    range: [12, 13],
+    loc: {
+      start: { column: 12, line: 1 },
+      end: { column: 13, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=",
+
+    range: [14, 15],
+    loc: {
+      start: { column: 14, line: 1 },
+      end: { column: 15, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [16, 17],
+    loc: {
+      start: { column: 16, line: 1 },
+      end: { column: 17, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..6a23dbc46ed
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,72 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias AST Alignment - AST 1`] = `
+"Snapshot Diff:
+- TSESTree
++ Babel
+
+  Program {
+    type: 'Program',
+    body: Array [
+      ExportNamedDeclaration {
+        type: 'ExportNamedDeclaration',
+        declaration: TSTypeAliasDeclaration {
+          type: 'TSTypeAliasDeclaration',
+          id: Identifier {
+            type: 'Identifier',
+            name: 'A',
+
+            range: [12, 13],
+            loc: {
+              start: { column: 12, line: 1 },
+              end: { column: 13, line: 1 },
+            },
+          },
+          typeAnnotation: TSLiteralType {
+            type: 'TSLiteralType',
+            literal: Literal {
+              type: 'Literal',
+              raw: '1',
+              value: 1,
+
+              range: [16, 17],
+              loc: {
+                start: { column: 16, line: 1 },
+                end: { column: 17, line: 1 },
+              },
+            },
+
+            range: [16, 17],
+            loc: {
+              start: { column: 16, line: 1 },
+              end: { column: 17, line: 1 },
+            },
+          },
+
+          range: [7, 18],
+          loc: {
+            start: { column: 7, line: 1 },
+            end: { column: 18, line: 1 },
+          },
+        },
+        exportKind: 'type',
+        source: null,
+        specifiers: Array [],
+
+        range: [0, 18],
+        loc: {
+          start: { column: 0, line: 1 },
+          end: { column: 18, line: 1 },
+        },
+      },
+    ],
+-   sourceType: 'module',
++   sourceType: 'script',
+
+    range: [0, 19],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 0, line: 2 },
+    },
+  }"
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..6f04a9a6981
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/type-alias/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration type-alias AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/fixture.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/fixture.ts
new file mode 100644
index 00000000000..ad1d380d6cc
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/fixture.ts
@@ -0,0 +1 @@
+export const x = 1;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/1-TSESTree-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/1-TSESTree-AST.shot
new file mode 100644
index 00000000000..ab30bcebe79
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/1-TSESTree-AST.shot
@@ -0,0 +1,70 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration TSESTree - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: VariableDeclaration {
+        type: "VariableDeclaration",
+        declarations: Array [
+          VariableDeclarator {
+            type: "VariableDeclarator",
+            id: Identifier {
+              type: "Identifier",
+              name: "x",
+
+              range: [13, 14],
+              loc: {
+                start: { column: 13, line: 1 },
+                end: { column: 14, line: 1 },
+              },
+            },
+            init: Literal {
+              type: "Literal",
+              raw: "1",
+              value: 1,
+
+              range: [17, 18],
+              loc: {
+                start: { column: 17, line: 1 },
+                end: { column: 18, line: 1 },
+              },
+            },
+
+            range: [13, 18],
+            loc: {
+              start: { column: 13, line: 1 },
+              end: { column: 18, line: 1 },
+            },
+          },
+        ],
+        kind: "const",
+
+        range: [7, 19],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 19, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 19],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 19, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 20],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/2-TSESTree-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/2-TSESTree-Tokens.shot
new file mode 100644
index 00000000000..73bd6c93bb9
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/2-TSESTree-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration TSESTree - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "const",
+
+    range: [7, 12],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "x",
+
+    range: [13, 14],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/3-Babel-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/3-Babel-AST.shot
new file mode 100644
index 00000000000..481e1f85b7d
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/3-Babel-AST.shot
@@ -0,0 +1,70 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration Babel - AST 1`] = `
+Program {
+  type: "Program",
+  body: Array [
+    ExportNamedDeclaration {
+      type: "ExportNamedDeclaration",
+      declaration: VariableDeclaration {
+        type: "VariableDeclaration",
+        declarations: Array [
+          VariableDeclarator {
+            type: "VariableDeclarator",
+            id: Identifier {
+              type: "Identifier",
+              name: "x",
+
+              range: [13, 14],
+              loc: {
+                start: { column: 13, line: 1 },
+                end: { column: 14, line: 1 },
+              },
+            },
+            init: Literal {
+              type: "Literal",
+              raw: "1",
+              value: 1,
+
+              range: [17, 18],
+              loc: {
+                start: { column: 17, line: 1 },
+                end: { column: 18, line: 1 },
+              },
+            },
+
+            range: [13, 18],
+            loc: {
+              start: { column: 13, line: 1 },
+              end: { column: 18, line: 1 },
+            },
+          },
+        ],
+        kind: "const",
+
+        range: [7, 19],
+        loc: {
+          start: { column: 7, line: 1 },
+          end: { column: 19, line: 1 },
+        },
+      },
+      exportKind: "value",
+      source: null,
+      specifiers: Array [],
+
+      range: [0, 19],
+      loc: {
+        start: { column: 0, line: 1 },
+        end: { column: 19, line: 1 },
+      },
+    },
+  ],
+  sourceType: "module",
+
+  range: [0, 20],
+  loc: {
+    start: { column: 0, line: 1 },
+    end: { column: 0, line: 2 },
+  },
+}
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/4-Babel-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/4-Babel-Tokens.shot
new file mode 100644
index 00000000000..1bfff47fa92
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/4-Babel-Tokens.shot
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration Babel - Tokens 1`] = `
+Array [
+  Keyword {
+    type: "Keyword",
+    value: "export",
+
+    range: [0, 6],
+    loc: {
+      start: { column: 0, line: 1 },
+      end: { column: 6, line: 1 },
+    },
+  },
+  Keyword {
+    type: "Keyword",
+    value: "const",
+
+    range: [7, 12],
+    loc: {
+      start: { column: 7, line: 1 },
+      end: { column: 12, line: 1 },
+    },
+  },
+  Identifier {
+    type: "Identifier",
+    value: "x",
+
+    range: [13, 14],
+    loc: {
+      start: { column: 13, line: 1 },
+      end: { column: 14, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: "=",
+
+    range: [15, 16],
+    loc: {
+      start: { column: 15, line: 1 },
+      end: { column: 16, line: 1 },
+    },
+  },
+  Numeric {
+    type: "Numeric",
+    value: "1",
+
+    range: [17, 18],
+    loc: {
+      start: { column: 17, line: 1 },
+      end: { column: 18, line: 1 },
+    },
+  },
+  Punctuator {
+    type: "Punctuator",
+    value: ";",
+
+    range: [18, 19],
+    loc: {
+      start: { column: 18, line: 1 },
+      end: { column: 19, line: 1 },
+    },
+  },
+]
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/5-AST-Alignment-AST.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/5-AST-Alignment-AST.shot
new file mode 100644
index 00000000000..bb45021e9c4
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/5-AST-Alignment-AST.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration AST Alignment - AST 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/6-AST-Alignment-Tokens.shot b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/6-AST-Alignment-Tokens.shot
new file mode 100644
index 00000000000..de15dbc1cc6
--- /dev/null
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/fixtures/variable-declaration/snapshots/6-AST-Alignment-Tokens.shot
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures declaration ExportNamedDeclaration variable-declaration AST Alignment - Token 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
diff --git a/packages/ast-spec/src/declaration/ExportNamedDeclaration/spec.ts b/packages/ast-spec/src/declaration/ExportNamedDeclaration/spec.ts
index b4347142809..09f584ef975 100644
--- a/packages/ast-spec/src/declaration/ExportNamedDeclaration/spec.ts
+++ b/packages/ast-spec/src/declaration/ExportNamedDeclaration/spec.ts
@@ -7,6 +7,7 @@ import type { ExportKind } from '../ExportAndImportKind';
 
 export interface ExportNamedDeclaration extends BaseNode {
   type: AST_NODE_TYPES.ExportNamedDeclaration;
+  // TODO(error handling) - ClassExpression is not valid here
   declaration: ExportDeclaration | null;
   specifiers: ExportSpecifier[];
   source: StringLiteral | null;
diff --git a/packages/ast-spec/tests/PunctuatorTokenToText.test.ts b/packages/ast-spec/tests/PunctuatorTokenToText.type-test.ts
similarity index 100%
rename from packages/ast-spec/tests/PunctuatorTokenToText.test.ts
rename to packages/ast-spec/tests/PunctuatorTokenToText.type-test.ts
diff --git a/packages/ast-spec/tests/ast-node-types.test.ts b/packages/ast-spec/tests/ast-node-types.type-test.ts
similarity index 100%
rename from packages/ast-spec/tests/ast-node-types.test.ts
rename to packages/ast-spec/tests/ast-node-types.type-test.ts
diff --git a/packages/ast-spec/tests/fixtures-with-differences-ast.shot b/packages/ast-spec/tests/fixtures-with-differences-ast.shot
new file mode 100644
index 00000000000..2a37d6b6582
--- /dev/null
+++ b/packages/ast-spec/tests/fixtures-with-differences-ast.shot
@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures List fixtures with AST differences 1`] = `
+Set {
+  "declaration/ClassDeclaration/fixtures/implements-many/fixture.ts",
+  "declaration/ClassDeclaration/fixtures/implements-one/fixture.ts",
+  "declaration/ClassDeclaration/fixtures/type-parameters-extends-type-parameters/fixture.ts",
+  "declaration/ClassDeclaration/fixtures/type-parameters/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/aliased/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/declare-function/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/identifier-braced/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/identifier-many/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/type-alias/fixture.ts",
+}
+`;
diff --git a/packages/ast-spec/tests/fixtures-with-differences-errors.shot b/packages/ast-spec/tests/fixtures-with-differences-errors.shot
new file mode 100644
index 00000000000..59b5c479a75
--- /dev/null
+++ b/packages/ast-spec/tests/fixtures-with-differences-errors.shot
@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures List fixtures with Error differences 1`] = `
+Object {
+  "Babel errored but TSESTree didn't": Set {
+    "declaration/ClassDeclaration/fixtures/_error_/implements-non-identifier/fixture.ts",
+    "declaration/ExportAllDeclaration/fixtures/_error_/type-kind/fixture.ts",
+    "declaration/ExportNamedDeclaration/fixtures/_error_/anonymous-class/fixture.ts",
+  },
+  "TSESTree errored but Babel didn't": Set {
+    "declaration/ExportAllDeclaration/fixtures/_error_/named-non-identifier/fixture.ts",
+    "declaration/ExportNamedDeclaration/fixtures/_error_/aliased-literal/fixture.ts",
+  },
+}
+`;
diff --git a/packages/ast-spec/tests/fixtures-with-differences-tokens.shot b/packages/ast-spec/tests/fixtures-with-differences-tokens.shot
new file mode 100644
index 00000000000..6c8d721a41a
--- /dev/null
+++ b/packages/ast-spec/tests/fixtures-with-differences-tokens.shot
@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`AST Fixtures List fixtures with Token differences 1`] = `
+Set {
+  "declaration/ClassDeclaration/fixtures/implements-many/fixture.ts",
+  "declaration/ClassDeclaration/fixtures/implements-one/fixture.ts",
+  "declaration/ExportDefaultDeclaration/fixtures/interface/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/enum/fixture.ts",
+  "declaration/ExportNamedDeclaration/fixtures/interface/fixture.ts",
+}
+`;
diff --git a/packages/ast-spec/tests/fixtures.test.ts b/packages/ast-spec/tests/fixtures.test.ts
new file mode 100644
index 00000000000..095c4179073
--- /dev/null
+++ b/packages/ast-spec/tests/fixtures.test.ts
@@ -0,0 +1,230 @@
+import fs from 'fs';
+import glob from 'glob';
+import makeDir from 'make-dir';
+import path from 'path';
+import { parseBabel } from './util/parsers/babel';
+import { Fixture } from './util/parsers/parser-types';
+import { parseTSESTree } from './util/parsers/typescript-estree';
+import { snapshotDiff, diffHasChanges } from './util/snapshot-diff';
+
+const PACKAGE_ROOT = path.resolve(__dirname, '..');
+const SRC_DIR = path.resolve(PACKAGE_ROOT, 'src');
+
+// Assign a segment set to this variable to limit the test to only this segment
+// This is super helpful if you need to debug why a specific fixture isn't producing the correct output
+// eg. ['declaration', 'ClassDeclaration', 'abstract'] will only test /declaration/ClassDeclaration/fixtures/abstract/fixture.ts
+// prettier-ignore
+const ONLY = [].join(path.sep);
+
+const fixturesWithASTDifferences = new Set<string>();
+const fixturesWithTokenDifferences = new Set<string>();
+enum ErrorLabel {
+  TSESTree = "TSESTree errored but Babel didn't",
+  Babel = "Babel errored but TSESTree didn't",
+  Both = 'Both errored',
+  None = 'No errors',
+}
+const fixturesWithErrorDifferences = {
+  [ErrorLabel.TSESTree]: new Set<string>(),
+  [ErrorLabel.Babel]: new Set<string>(),
+} as const;
+
+const validFixtures = glob.sync(`${SRC_DIR}/**/fixtures/*/*.{ts,tsx}`);
+const errorFixtures = glob.sync(`${SRC_DIR}/**/fixtures/_error_/*/*.{ts,tsx}`);
+
+const fixtures: readonly Fixture[] = [...validFixtures, ...errorFixtures].map(
+  absolute => {
+    const relativeToSrc = path.relative(SRC_DIR, absolute);
+    const { dir, ext } = path.parse(relativeToSrc);
+    const segments = dir.split(path.sep).filter(s => s !== 'fixtures');
+    const name = segments.pop()!;
+    const snapshotPath = path.join(SRC_DIR, dir, 'snapshots');
+    return {
+      absolute,
+      name,
+      ext,
+      isError: absolute.includes('/_error_/'),
+      isJSX: ext.endsWith('x'),
+      relative: path.relative(SRC_DIR, absolute),
+      segments,
+      snapshotPath,
+      snapshotFiles: {
+        success: {
+          tsestree: {
+            ast: path.join(snapshotPath, '1-TSESTree-AST.shot'),
+            tokens: path.join(snapshotPath, '2-TSESTree-Tokens.shot'),
+          },
+          babel: {
+            ast: path.join(snapshotPath, '3-Babel-AST.shot'),
+            tokens: path.join(snapshotPath, '4-Babel-Tokens.shot'),
+          },
+          alignment: {
+            ast: path.join(snapshotPath, '5-AST-Alignment-AST.shot'),
+            tokens: path.join(snapshotPath, '6-AST-Alignment-Tokens.shot'),
+          },
+        },
+        error: {
+          tsestree: path.join(snapshotPath, '1-TSESTree-Error.shot'),
+          babel: path.join(snapshotPath, '2-Babel-Error.shot'),
+          alignment: path.join(snapshotPath, '3-Alignment-Error.shot'),
+        },
+      },
+    };
+  },
+);
+
+function isError(e: unknown): e is { code: unknown } {
+  return typeof e === 'object' && e != null && 'code' in e;
+}
+
+function nestDescribe(fixture: Fixture, segments = fixture.segments): void {
+  if (segments.length > 0) {
+    describe(segments[0], () => {
+      nestDescribe(fixture, segments.slice(1));
+    });
+  } else {
+    const test = (): void => {
+      const contents = fs.readFileSync(fixture.absolute, 'utf8');
+
+      try {
+        makeDir.sync(fixture.snapshotPath);
+      } catch (e) {
+        if (isError(e) && e.code === 'EEXIST') {
+          // already exists - ignored
+        } else {
+          throw e;
+        }
+      }
+
+      const tsestreeParsed = parseTSESTree(fixture, contents);
+      const babelParsed = parseBabel(fixture, contents);
+      const babelError = babelParsed.error !== 'NO ERROR';
+      const tsestreeError = tsestreeParsed.error !== 'NO ERROR';
+      let errorLabel: ErrorLabel;
+      if (!babelError && tsestreeError) {
+        errorLabel = ErrorLabel.TSESTree;
+      } else if (babelError && !tsestreeError) {
+        errorLabel = ErrorLabel.Babel;
+      } else if (babelError && tsestreeError) {
+        errorLabel = ErrorLabel.Both;
+      } else {
+        errorLabel = ErrorLabel.None;
+      }
+      if (fixture.isError) {
+        it('TSESTree - Error', () => {
+          expect(tsestreeParsed.error).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.error.tsestree,
+          );
+        });
+        it('Babel - Error', () => {
+          expect(babelParsed.error).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.error.babel,
+          );
+        });
+        it('Error Alignment', () => {
+          if (
+            errorLabel === ErrorLabel.TSESTree ||
+            errorLabel === ErrorLabel.Babel
+          ) {
+            fixturesWithErrorDifferences[errorLabel].add(fixture.relative);
+          }
+          expect(errorLabel).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.error.alignment,
+          );
+        });
+        it('Should parse with errors', () => {
+          // if this fails and you WEREN'T expecting a parser error, then your fixture should not be in the `_error_` subfolder
+          // if this fails and you WERE expecting a parser error - then something is broken.
+          expect(errorLabel).not.toBe(ErrorLabel.None);
+        });
+      } else {
+        it('TSESTree - AST', () => {
+          expect(tsestreeParsed.ast).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.tsestree.ast,
+          );
+        });
+        it('TSESTree - Tokens', () => {
+          expect(tsestreeParsed.tokens).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.tsestree.tokens,
+          );
+        });
+
+        it('Babel - AST', () => {
+          expect(babelParsed.ast).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.babel.ast,
+          );
+        });
+        it('Babel - Tokens', () => {
+          expect(babelParsed.tokens).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.babel.tokens,
+          );
+        });
+
+        it('AST Alignment - AST', () => {
+          const diffResult = snapshotDiff(
+            'TSESTree',
+            tsestreeParsed.ast,
+            'Babel',
+            babelParsed.ast,
+          );
+          expect(diffResult).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.alignment.ast,
+          );
+
+          if (diffHasChanges(diffResult)) {
+            fixturesWithASTDifferences.add(fixture.relative);
+          }
+        });
+        it('AST Alignment - Token', () => {
+          const diffResult = snapshotDiff(
+            'TSESTree',
+            tsestreeParsed.tokens,
+            'Babel',
+            babelParsed.tokens,
+          );
+          expect(diffResult).toMatchSpecificSnapshot(
+            fixture.snapshotFiles.success.alignment.tokens,
+          );
+
+          if (diffHasChanges(diffResult)) {
+            fixturesWithTokenDifferences.add(fixture.relative);
+          }
+        });
+
+        it('Should parse with no errors', () => {
+          // if this fails and you WERE expecting a parser error, then your fixture should be in the `_error_` subfolder
+          // if this fails and you WEREN'T expecting a parser error - then something is broken.
+          expect(errorLabel).toBe(ErrorLabel.None);
+        });
+      }
+    };
+
+    if ([...fixture.segments, fixture.name].join(path.sep) === ONLY) {
+      // eslint-disable-next-line jest/no-focused-tests
+      describe.only(fixture.name, test);
+    } else {
+      describe(fixture.name, test);
+    }
+  }
+}
+
+describe('AST Fixtures', () => {
+  fixtures.forEach(f => nestDescribe(f));
+
+  // once we've run all the tests, snapshot the list of fixtures that have differences for easy reference
+  it('List fixtures with AST differences', () => {
+    expect(fixturesWithASTDifferences).toMatchSpecificSnapshot(
+      path.resolve(__dirname, 'fixtures-with-differences-ast.shot'),
+    );
+  });
+  it('List fixtures with Token differences', () => {
+    expect(fixturesWithTokenDifferences).toMatchSpecificSnapshot(
+      path.resolve(__dirname, 'fixtures-with-differences-tokens.shot'),
+    );
+  });
+  it('List fixtures with Error differences', () => {
+    expect(fixturesWithErrorDifferences).toMatchSpecificSnapshot(
+      path.resolve(__dirname, 'fixtures-with-differences-errors.shot'),
+    );
+  });
+});
diff --git a/packages/ast-spec/tests/util/parsers/babel.ts b/packages/ast-spec/tests/util/parsers/babel.ts
new file mode 100644
index 00000000000..dbbfec34fd0
--- /dev/null
+++ b/packages/ast-spec/tests/util/parsers/babel.ts
@@ -0,0 +1,49 @@
+import { parse, ParserPlugin } from '@babel/eslint-parser';
+import { Fixture, ParserResponse } from './parser-types';
+
+const PLUGINS: ParserPlugin[] = [
+  // TODO - enable classFeatures instead of classProperties when we support it
+  // 'classFeatures',
+  'classProperties',
+  'decorators-legacy',
+  'typescript',
+];
+
+export function parseBabel(fixture: Fixture, contents: string): ParserResponse {
+  const plugins = [...PLUGINS];
+  if (fixture.isJSX) {
+    plugins.push('jsx');
+  }
+
+  let ast: unknown | 'ERROR' = 'ERROR';
+  let tokens: unknown | 'ERROR' = 'ERROR';
+  let error: unknown | 'NO ERROR' = 'NO ERROR';
+
+  try {
+    const result = parse(contents, {
+      allowImportExportEverywhere: true,
+      babelOptions: {
+        parserOpts: {
+          plugins,
+        },
+      },
+      ecmaFeatures: {
+        globalReturn: true,
+      },
+      requireConfigFile: false,
+      sourceType: 'unambiguous',
+    });
+    const { tokens: _, comments: __, ...program } = result;
+
+    tokens = result.tokens;
+    ast = program;
+  } catch (e: unknown) {
+    error = e;
+  }
+
+  return {
+    tokens,
+    ast,
+    error,
+  };
+}
diff --git a/packages/ast-spec/tests/util/parsers/parser-types.ts b/packages/ast-spec/tests/util/parsers/parser-types.ts
new file mode 100644
index 00000000000..6bc6fe71b3b
--- /dev/null
+++ b/packages/ast-spec/tests/util/parsers/parser-types.ts
@@ -0,0 +1,33 @@
+interface SuccessSnapshotPaths {
+  readonly ast: string;
+  readonly tokens: string;
+}
+
+export interface Fixture {
+  readonly absolute: string;
+  readonly name: string;
+  readonly ext: string;
+  readonly isError: boolean;
+  readonly isJSX: boolean;
+  readonly relative: string;
+  readonly segments: string[];
+  readonly snapshotPath: string;
+  readonly snapshotFiles: {
+    readonly success: {
+      readonly tsestree: SuccessSnapshotPaths;
+      readonly babel: SuccessSnapshotPaths;
+      readonly alignment: SuccessSnapshotPaths;
+    };
+    readonly error: {
+      readonly tsestree: string;
+      readonly babel: string;
+      readonly alignment: string;
+    };
+  };
+}
+
+export interface ParserResponse {
+  readonly ast: unknown | 'ERROR';
+  readonly tokens: unknown | 'ERROR';
+  readonly error: unknown | 'NO ERROR';
+}
diff --git a/packages/ast-spec/tests/util/parsers/typescript-estree.ts b/packages/ast-spec/tests/util/parsers/typescript-estree.ts
new file mode 100644
index 00000000000..07a6fd64491
--- /dev/null
+++ b/packages/ast-spec/tests/util/parsers/typescript-estree.ts
@@ -0,0 +1,33 @@
+import { parse, TSESTree } from '../typescript-estree-import';
+import { Fixture, ParserResponse } from './parser-types';
+
+export function parseTSESTree(
+  fixture: Fixture,
+  contents: string,
+): ParserResponse {
+  let ast: TSESTree.Program | 'ERROR' = 'ERROR';
+  let tokens: TSESTree.Token[] | 'ERROR' = 'ERROR';
+  let error: unknown | 'NO ERROR' = 'NO ERROR';
+
+  try {
+    const result = parse(contents, {
+      comment: false,
+      jsx: fixture.ext.endsWith('x'),
+      loc: true,
+      range: true,
+      tokens: true,
+    });
+    const { tokens: _, comments: __, ...program } = result;
+
+    tokens = result.tokens;
+    ast = program;
+  } catch (e: unknown) {
+    error = e;
+  }
+
+  return {
+    tokens,
+    ast,
+    error,
+  };
+}
diff --git a/packages/ast-spec/tests/util/serializers/Node.ts b/packages/ast-spec/tests/util/serializers/Node.ts
new file mode 100644
index 00000000000..a9e6b4ddf06
--- /dev/null
+++ b/packages/ast-spec/tests/util/serializers/Node.ts
@@ -0,0 +1,83 @@
+import type * as TSESTree from '../../../src';
+import { NewPlugin } from 'pretty-format';
+import { AST_NODE_TYPES } from '../../../src';
+
+function sortKeys(node: TSESTree.Node): (keyof typeof node)[] {
+  const keySet = new Set(Object.keys(node));
+
+  // type place as first key
+  keySet.delete('type');
+  // range and loc we place after all properties
+  keySet.delete('range');
+  keySet.delete('loc');
+
+  // babel keys
+  keySet.delete('start');
+  keySet.delete('end');
+  if (node.type === AST_NODE_TYPES.Program) {
+    keySet.delete('interpreter');
+  }
+
+  return Array.from(keySet).sort((a, b) =>
+    a.localeCompare(b),
+  ) as (keyof typeof node)[];
+}
+
+function stringifyLineAndColumn(loc: TSESTree.Position): string {
+  return `{ column: ${loc.column}, line: ${loc.line} }`;
+}
+
+function isObject(val: unknown): val is Record<string, unknown> {
+  return val != null && typeof val === 'object';
+}
+function hasValidType(type: unknown): type is string {
+  return typeof type === 'string';
+}
+
+const serializer: NewPlugin = {
+  test(val: unknown) {
+    return isObject(val) && hasValidType(val.type);
+  },
+  serialize(node: TSESTree.Node, config, indentation, depth, refs, printer) {
+    const keys = sortKeys(node);
+    const type = node.type;
+    const loc = node.loc;
+    const range = node.range;
+
+    const outputLines = [];
+    const childIndentation = indentation + config.indent;
+
+    const printValue = (value: unknown): string =>
+      printer(value, config, childIndentation, depth, refs);
+
+    outputLines.push(`${type} {`);
+    outputLines.push(`${childIndentation}type: ${printValue(type)},`);
+
+    for (const key of keys) {
+      const value = node[key];
+      if (value === undefined) {
+        continue;
+      }
+
+      outputLines.push(`${childIndentation}${key}: ${printValue(value)},`);
+    }
+
+    outputLines.push('');
+    outputLines.push(`${childIndentation}range: [${range.join(', ')}],`);
+    outputLines.push(
+      `${childIndentation}loc: {`,
+      `${childIndentation}${config.indent}start: ${stringifyLineAndColumn(
+        loc.start,
+      )},`,
+      `${childIndentation}${config.indent}end: ${stringifyLineAndColumn(
+        loc.end,
+      )},`,
+      `${childIndentation}},`,
+    );
+    outputLines.push(`${indentation}}`);
+
+    return outputLines.join('\n');
+  },
+};
+
+export { serializer };
diff --git a/packages/ast-spec/tests/util/serializers/index.ts b/packages/ast-spec/tests/util/serializers/index.ts
new file mode 100644
index 00000000000..c9c0e3c54be
--- /dev/null
+++ b/packages/ast-spec/tests/util/serializers/index.ts
@@ -0,0 +1,6 @@
+import * as Node from './Node';
+
+export const serializers = [
+  //
+  Node.serializer,
+] as const;
diff --git a/packages/ast-spec/tests/util/serializers/string.ts b/packages/ast-spec/tests/util/serializers/string.ts
new file mode 100644
index 00000000000..81750c26009
--- /dev/null
+++ b/packages/ast-spec/tests/util/serializers/string.ts
@@ -0,0 +1,38 @@
+import { NewPlugin } from 'pretty-format';
+
+// custom string serializer so that we can use single-quoted strings instead of double quoted strings
+// this plays nicer with the way that the snapshot diff result, which is a pure string
+const serializer: NewPlugin = {
+  test(val: unknown) {
+    return typeof val === 'string';
+  },
+  serialize(
+    str: string,
+    // config,
+    // indentation,
+    // depth,
+    // refs,
+    // printer,
+  ) {
+    const characters: string[] = [];
+
+    characters.push("'");
+    for (const character of str) {
+      switch (character) {
+        case "'":
+          characters.push('\\');
+          break;
+
+        case '\\':
+          characters.push('\\');
+          break;
+      }
+      characters.push(character);
+    }
+    characters.push("'");
+
+    return characters.join('');
+  },
+};
+
+export { serializer };
diff --git a/packages/ast-spec/tests/util/setupJest.ts b/packages/ast-spec/tests/util/setupJest.ts
new file mode 100644
index 00000000000..6b9e99943bf
--- /dev/null
+++ b/packages/ast-spec/tests/util/setupJest.ts
@@ -0,0 +1,8 @@
+import { addSerializer } from 'jest-specific-snapshot';
+import { serializers } from './serializers';
+
+for (const serializer of serializers) {
+  // the jest types are wrong here
+  expect.addSnapshotSerializer(serializer);
+  addSerializer(serializer);
+}
diff --git a/packages/ast-spec/tests/util/snapshot-diff.ts b/packages/ast-spec/tests/util/snapshot-diff.ts
new file mode 100644
index 00000000000..b78e8984537
--- /dev/null
+++ b/packages/ast-spec/tests/util/snapshot-diff.ts
@@ -0,0 +1,65 @@
+import { diff } from 'jest-diff';
+import { NO_DIFF_MESSAGE } from 'jest-diff/build/constants';
+import defaultPrinter from 'pretty-format';
+import * as NodeSerializer from './serializers/Node';
+import * as StringSerializer from './serializers/string';
+
+function identity<T>(value: T): T {
+  return value;
+}
+
+function diffStrings(
+  valueA: unknown,
+  valueB: unknown,
+  valueAName: string,
+  valueBName: string,
+): string | null {
+  return diff(valueA, valueB, {
+    expand: false,
+    // we want to show the entire file in the diff
+    // that way you don't have to try and figure out what lines map to which sections
+    contextLines: Number.MAX_SAFE_INTEGER,
+    aAnnotation: valueAName,
+    bAnnotation: valueBName,
+    aColor: identity,
+    bColor: identity,
+    changeColor: identity,
+    commonColor: identity,
+    patchColor: identity,
+  });
+}
+
+export function snapshotDiff(
+  valueAName: string,
+  valueA: unknown,
+  valueBName: string,
+  valueB: unknown,
+): string {
+  const OPTIONS = {
+    plugins: [
+      NodeSerializer.serializer,
+      // by default jest will quote the string with double quotes
+      // this means the diff string will have double quotes escaped and look ugly
+      // this is a single-quote string serializer which won't clash with the outer double quotes
+      // so we get a nicer looking diff because of it!
+      StringSerializer.serializer,
+    ],
+  };
+
+  const difference = diffStrings(
+    defaultPrinter(valueA, OPTIONS),
+    defaultPrinter(valueB, OPTIONS),
+    valueAName,
+    valueBName,
+  );
+
+  if (difference == null) {
+    throw new Error('Unexpected null when diffing snapshots.');
+  }
+
+  return 'Snapshot Diff:\n' + difference;
+}
+
+export function diffHasChanges(diff: string): boolean {
+  return !diff.includes(NO_DIFF_MESSAGE);
+}
diff --git a/packages/ast-spec/tests/util/typescript-estree-import.ts b/packages/ast-spec/tests/util/typescript-estree-import.ts
new file mode 100644
index 00000000000..a725ef2f5de
--- /dev/null
+++ b/packages/ast-spec/tests/util/typescript-estree-import.ts
@@ -0,0 +1,17 @@
+/**
+ * Nx is picking up on the fact that we techically have a circular dependency between ast-spec
+ * and typescript-estree.
+ *
+ * This circular dependency only occurs in the tests/ for ast-spec and not in the main package source.
+ *
+ * We could therefore solve this by separating the ast-spec tests out into their own package, but the
+ * other option is to get Nx to turn a blind eye to the circular dependency by doing the following:
+ *
+ * - Removing @typescript-eslint/typescript-estree as an explicit devDependency in the package.json
+ * - Add an .nxignore file at the root of the monorepo which ignores this file (which we then in turn
+ * ensure is the only place we directly import from the @typescript-eslint/typescript-estree package).
+ */
+
+// We need to ignore this lint error regarding it being missing from the package.json, see above.
+// eslint-disable-next-line import/no-extraneous-dependencies
+export { parse, TSESTree } from '@typescript-eslint/typescript-estree';
diff --git a/packages/ast-spec/tsconfig.build.json b/packages/ast-spec/tsconfig.build.json
index 215a0282df2..89b0284199a 100644
--- a/packages/ast-spec/tsconfig.build.json
+++ b/packages/ast-spec/tsconfig.build.json
@@ -6,5 +6,6 @@
     "rootDir": "./src",
     "resolveJsonModule": true
   },
-  "include": ["src", "typings"]
+  "include": ["src", "typings"],
+  "exclude": ["**/fixtures/**"]
 }
diff --git a/packages/ast-spec/tsconfig.json b/packages/ast-spec/tsconfig.json
index 4b76ef4253b..fd3827cd5ba 100644
--- a/packages/ast-spec/tsconfig.json
+++ b/packages/ast-spec/tsconfig.json
@@ -4,5 +4,7 @@
     "composite": false,
     "rootDir": "."
   },
-  "include": ["src", "typings", "tests", "tools", "./rollup.config.ts"]
+  "include": ["src", "typings", "tests", "tools", "./rollup.config.ts"],
+  "exclude": ["**/fixtures/**"],
+  "references": [{ "path": "../typescript-estree/tsconfig.build.json" }]
 }
diff --git a/packages/ast-spec/typings/babel-eslint-parser.d.ts b/packages/ast-spec/typings/babel-eslint-parser.d.ts
new file mode 100644
index 00000000000..a18a6597a94
--- /dev/null
+++ b/packages/ast-spec/typings/babel-eslint-parser.d.ts
@@ -0,0 +1,24 @@
+declare module '@babel/eslint-parser' {
+  import type { TransformOptions } from '@babel/core';
+
+  export type { ParserPlugin } from '@babel/parser';
+
+  export interface Options {
+    readonly allowImportExportEverywhere?: boolean;
+    readonly babelOptions?: TransformOptions;
+    readonly ecmaFeatures?: {
+      readonly globalReturn?: boolean;
+    };
+    readonly requireConfigFile?: boolean;
+    readonly sourceType?: string;
+  }
+
+  export interface BabelAST {
+    readonly tokens: unknown;
+    readonly comments: unknown;
+    readonly [k: string]: unknown;
+  }
+
+  export function parse(code: string, options: Options): BabelAST;
+  // export function parseForESLint(code: string, options: Options): unknown;
+}
diff --git a/packages/scope-manager/package.json b/packages/scope-manager/package.json
index 5c165d5f659..cec9bc7e53e 100644
--- a/packages/scope-manager/package.json
+++ b/packages/scope-manager/package.json
@@ -32,6 +32,7 @@
     "postbuild": "downlevel-dts dist _ts3.4/dist",
     "clean": "tsc -b tsconfig.build.json --clean",
     "postclean": "rimraf dist && rimraf _ts3.4 && rimraf coverage",
+    "clean-fixtures": "rimraf -g \"./src/**/fixtures/**/snapshots\"",
     "format": "prettier --write \"./**/*.{ts,js,json,md}\" --ignore-path ../../.prettierignore",
     "generate:lib": "../../node_modules/.bin/ts-node --files --transpile-only tools/generate-lib.ts",
     "lint": "eslint . --ext .js,.ts --ignore-path='../../.eslintignore'",
diff --git a/packages/scope-manager/tests/fixtures.test.ts b/packages/scope-manager/tests/fixtures.test.ts
index b504710c4cf..f029367ba06 100644
--- a/packages/scope-manager/tests/fixtures.test.ts
+++ b/packages/scope-manager/tests/fixtures.test.ts
@@ -185,7 +185,7 @@ if (ONLY === '') {
   describe('ast snapshots should have an associated test', () => {
     for (const snap of snapshots) {
       it(snap.relative, () => {
-        fs.existsSync(snap.fixturePath);
+        expect(fs.existsSync(snap.fixturePath)).toBeTruthy();
       });
     }
   });
diff --git a/packages/types/tools/copy-ast-spec.ts b/packages/types/tools/copy-ast-spec.ts
index 0288453a310..f1cb38be40d 100644
--- a/packages/types/tools/copy-ast-spec.ts
+++ b/packages/types/tools/copy-ast-spec.ts
@@ -1,18 +1,43 @@
-import chlidProcess from 'child_process';
+import childProcess from 'child_process';
 import fs from 'fs';
 import path from 'path';
 import { promisify } from 'util';
 
 const readFile = promisify(fs.readFile);
 const writeFile = promisify(fs.writeFile);
-const execAsync = promisify(chlidProcess.exec);
+
+// the promisify util will eat the stderr logs
+async function execAsync(
+  command: string,
+  args: ReadonlyArray<string>,
+  options: childProcess.SpawnOptions,
+): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const child = childProcess.spawn(command, args, {
+      ...options,
+      stdio: 'inherit',
+    });
+
+    child.on('error', e => reject(e));
+    child.on('exit', () => resolve());
+    child.on('close', () => resolve());
+
+    // (error, stdout, stderr) => {
+    //   if (error) {
+    //     console.error(stderr);
+    //     reject(error);
+    //     return;
+    //   }
+
+    //   // console.log(stdout);
+    //   resolve();
+    // },
+  });
+}
 
 const AST_SPEC_PATH = path.resolve(__dirname, '../../ast-spec');
 const OUTPUT_PATH = path.join(path.resolve(__dirname, '../src/'));
 
-// ensure the package is built
-chlidProcess.execSync('yarn build', { cwd: AST_SPEC_PATH, stdio: 'inherit' });
-
 const HEADER = `\
 /**********************************************
  *      DO NOT MODIFY THIS FILE MANUALLY      *
@@ -43,12 +68,15 @@ async function copyFile(
     encoding: 'utf-8',
   });
 
-  await execAsync(`yarn prettier --write ${outpath}`);
+  await execAsync('yarn', ['prettier', '--write', outpath], {});
 
   console.log('Copied', fileName);
 }
 
 async function main(): Promise<void> {
+  // ensure the package is built
+  await execAsync('yarn', ['build'], { cwd: AST_SPEC_PATH });
+
   await Promise.all([
     copyFile('dist', 'ast-spec.ts', code =>
       code.replace(/export declare enum/g, 'export enum'),
diff --git a/packages/visitor-keys/tests/visitor-keys.test.ts b/packages/visitor-keys/tests/visitor-keys.test.ts
index a6fe66bc540..ca727a5de33 100644
--- a/packages/visitor-keys/tests/visitor-keys.test.ts
+++ b/packages/visitor-keys/tests/visitor-keys.test.ts
@@ -20,6 +20,11 @@ const IGNORED_KEYS = new Set([
 describe('Every visitor key should have an ast node type defined', () => {
   for (const key of keys) {
     if (IGNORED_KEYS.has(key)) {
+      if (types.has(key)) {
+        it(`${key} should not be ignored as it has an AST_NODE_TYPE defined`, () => {
+          expect(true).toBeFalsy();
+        });
+      }
       continue;
     }
 
diff --git a/yarn.lock b/yarn.lock
index 5486c7f7140..f402df780f0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,7 +2,7 @@
 # yarn lockfile v1
 
 
-"@babel/code-frame@*", "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.12.13", "@babel/code-frame@^7.14.5", "@babel/code-frame@^7.15.8":
+"@babel/code-frame@*", "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.12.13", "@babel/code-frame@^7.14.5":
   version "7.15.8"
   resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.15.8.tgz#45990c47adadb00c03677baa89221f7cc23d2503"
   integrity sha512-2IAnmn8zbvC/jKYhq5Ki9I+DwjlrtMPUCH/CpHvqI4dNnlwHwsxoIhlc8WcYY5LSYknXQtAlFYuHfqAFCvQ4Wg==
@@ -21,20 +21,20 @@
   resolved "https://registry.yarnpkg.com/@babel/compat-data/-/compat-data-7.15.0.tgz#2dbaf8b85334796cafbb0f5793a90a2fc010b176"
   integrity sha512-0NqAC1IJE0S0+lL1SWFMxMkz1pKCNCjI4tr2Zx4LJSXxCLAdr6KyArnY+sno5m3yH9g737ygOyPABDsnXkpxiA==
 
-"@babel/core@^7.1.0", "@babel/core@^7.7.2", "@babel/core@^7.7.5":
-  version "7.15.8"
-  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.15.8.tgz#195b9f2bffe995d2c6c159e72fe525b4114e8c10"
-  integrity sha512-3UG9dsxvYBMYwRv+gS41WKHno4K60/9GPy1CJaH6xy3Elq8CTtvtjT5R5jmNhXfCYLX2mTw+7/aq5ak/gOE0og==
-  dependencies:
-    "@babel/code-frame" "^7.15.8"
-    "@babel/generator" "^7.15.8"
-    "@babel/helper-compilation-targets" "^7.15.4"
-    "@babel/helper-module-transforms" "^7.15.8"
-    "@babel/helpers" "^7.15.4"
-    "@babel/parser" "^7.15.8"
-    "@babel/template" "^7.15.4"
-    "@babel/traverse" "^7.15.4"
-    "@babel/types" "^7.15.6"
+"@babel/core@*", "@babel/core@^7.1.0", "@babel/core@^7.7.2", "@babel/core@^7.7.5":
+  version "7.14.3"
+  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.14.3.tgz#5395e30405f0776067fbd9cf0884f15bfb770a38"
+  integrity sha512-jB5AmTKOCSJIZ72sd78ECEhuPiDMKlQdDI/4QRI6lzYATx5SSogS1oQA2AoPecRCknm30gHi2l+QVvNUu3wZAg==
+  dependencies:
+    "@babel/code-frame" "^7.12.13"
+    "@babel/generator" "^7.14.3"
+    "@babel/helper-compilation-targets" "^7.13.16"
+    "@babel/helper-module-transforms" "^7.14.2"
+    "@babel/helpers" "^7.14.0"
+    "@babel/parser" "^7.14.3"
+    "@babel/template" "^7.12.13"
+    "@babel/traverse" "^7.14.2"
+    "@babel/types" "^7.14.2"
     convert-source-map "^1.7.0"
     debug "^4.1.0"
     gensync "^1.0.0-beta.2"
@@ -42,7 +42,16 @@
     semver "^6.3.0"
     source-map "^0.5.0"
 
-"@babel/generator@^7.15.4", "@babel/generator@^7.15.8", "@babel/generator@^7.7.2":
+"@babel/eslint-parser@*", "@babel/eslint-parser@^7.15.4":
+  version "7.15.4"
+  resolved "https://registry.yarnpkg.com/@babel/eslint-parser/-/eslint-parser-7.15.4.tgz#46385943726291fb3e8db99522c8099b15684387"
+  integrity sha512-hPMIAmGNbmQzXJIo2P43Zj9UhRmGev5f9nqdBFOWNGDGh6XKmjby79woBvg6y0Jur6yRfQBneDbUQ8ZVc1krFw==
+  dependencies:
+    eslint-scope "^5.1.1"
+    eslint-visitor-keys "^2.1.0"
+    semver "^6.3.0"
+
+"@babel/generator@^7.14.3", "@babel/generator@^7.15.4", "@babel/generator@^7.7.2":
   version "7.15.8"
   resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.15.8.tgz#fa56be6b596952ceb231048cf84ee499a19c0cd1"
   integrity sha512-ECmAKstXbp1cvpTTZciZCgfOt6iN64lR0d+euv3UZisU5awfRawOvg07Utn/qBGuH4bRIEZKrA/4LzZyXhZr8g==
@@ -51,7 +60,7 @@
     jsesc "^2.5.1"
     source-map "^0.5.0"
 
-"@babel/helper-compilation-targets@^7.15.4":
+"@babel/helper-compilation-targets@^7.13.16":
   version "7.15.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-compilation-targets/-/helper-compilation-targets-7.15.4.tgz#cf6d94f30fbefc139123e27dd6b02f65aeedb7b9"
   integrity sha512-rMWPCirulnPSe4d+gwdWXLfAXTTBj8M3guAf5xFQJ0nvFY7tfNAFnWdqaHegHlgDZOCT4qvhF3BYlSJag8yhqQ==
@@ -98,7 +107,7 @@
   dependencies:
     "@babel/types" "^7.15.4"
 
-"@babel/helper-module-transforms@^7.15.8":
+"@babel/helper-module-transforms@^7.14.2":
   version "7.15.8"
   resolved "https://registry.yarnpkg.com/@babel/helper-module-transforms/-/helper-module-transforms-7.15.8.tgz#d8c0e75a87a52e374a8f25f855174786a09498b2"
   integrity sha512-DfAfA6PfpG8t4S6npwzLvTUpp0sS7JrcuaMiy1Y5645laRJIp/LiLGIBbQKaXSInK8tiGNI7FL7L8UvB8gdUZg==
@@ -158,7 +167,7 @@
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-option/-/helper-validator-option-7.14.5.tgz#6e72a1fff18d5dfcb878e1e62f1a021c4b72d5a3"
   integrity sha512-OX8D5eeX4XwcroVW45NMvoYaIuFI+GQpA2a8Gi+X/U/cDUIRsV37qQfF905F0htTRCREQIB4KqPeaveRJUl3Ow==
 
-"@babel/helpers@^7.15.4":
+"@babel/helpers@^7.14.0":
   version "7.15.4"
   resolved "https://registry.yarnpkg.com/@babel/helpers/-/helpers-7.15.4.tgz#5f40f02050a3027121a3cf48d497c05c555eaf43"
   integrity sha512-V45u6dqEJ3w2rlryYYXf6i9rQ5YMNu4FLS6ngs8ikblhu2VdR1AqAd6aJjBzmf2Qzh6KOLqKHxEN9+TFbAkAVQ==
@@ -176,7 +185,7 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/parser@*", "@babel/parser@^7.1.0", "@babel/parser@^7.15.4", "@babel/parser@^7.15.7", "@babel/parser@^7.15.8", "@babel/parser@^7.7.2":
+"@babel/parser@*", "@babel/parser@^7.1.0", "@babel/parser@^7.14.3", "@babel/parser@^7.15.4", "@babel/parser@^7.15.7", "@babel/parser@^7.7.2":
   version "7.15.8"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.15.8.tgz#7bacdcbe71bdc3ff936d510c15dcea7cf0b99016"
   integrity sha512-BRYa3wcQnjS/nqI8Ac94pYYpJfojHVvVXJ97+IDCImX4Jc8W8Xv1+47enbruk+q1etOpsQNwnfFcNGw+gtPGxA==
@@ -279,7 +288,7 @@
   dependencies:
     regenerator-runtime "^0.13.4"
 
-"@babel/template@^7.15.4", "@babel/template@^7.3.3":
+"@babel/template@^7.12.13", "@babel/template@^7.15.4", "@babel/template@^7.3.3":
   version "7.15.4"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.15.4.tgz#51898d35dcf3faa670c4ee6afcfd517ee139f194"
   integrity sha512-UgBAfEa1oGuYgDIPM2G+aHa4Nlo9Lh6mGD2bDBGMTbYnc38vulXPuC1MGjYILIEmlwl6Rd+BPR9ee3gm20CBtg==
@@ -288,7 +297,7 @@
     "@babel/parser" "^7.15.4"
     "@babel/types" "^7.15.4"
 
-"@babel/traverse@^7.1.0", "@babel/traverse@^7.15.4", "@babel/traverse@^7.7.2":
+"@babel/traverse@^7.1.0", "@babel/traverse@^7.14.2", "@babel/traverse@^7.15.4", "@babel/traverse@^7.7.2":
   version "7.15.4"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.15.4.tgz#ff8510367a144bfbff552d9e18e28f3e2889c22d"
   integrity sha512-W6lQD8l4rUbQR/vYgSuCAE75ADyyQvOpFVsvPPdkhf6lATXAsQIG9YdtOcu8BB1dZ0LKu+Zo3c1wEcbKeuhdlA==
@@ -303,7 +312,7 @@
     debug "^4.1.0"
     globals "^11.1.0"
 
-"@babel/types@*", "@babel/types@^7.0.0", "@babel/types@^7.15.4", "@babel/types@^7.15.6", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
+"@babel/types@*", "@babel/types@^7.0.0", "@babel/types@^7.14.2", "@babel/types@^7.15.4", "@babel/types@^7.15.6", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
   version "7.15.6"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.15.6.tgz#99abdc48218b2881c058dd0a7ab05b99c9be758f"
   integrity sha512-BPU+7QhqNjmWyDO0/vitH/CuhpV8ZmK1wpKva8nuyNF5MJfuRNWMc+hc14+u9xT93kvykMdncrJT19h74uB1Ig==
@@ -1029,7 +1038,7 @@
     jest-haste-map "^27.3.1"
     jest-runtime "^27.3.1"
 
-"@jest/transform@^27.2.2", "@jest/transform@^27.3.1":
+"@jest/transform@^27.0.2", "@jest/transform@^27.2.2", "@jest/transform@^27.3.1":
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/@jest/transform/-/transform-27.3.1.tgz#ff80eafbeabe811e9025e4b6f452126718455220"
   integrity sha512-3fSvQ02kuvjOI1C1ssqMVBKJpZf6nwoCiSu00zAKh5nrp3SptNtZy/8s5deayHnqxhjD9CWDJ+yqQwuQ0ZafXQ==
@@ -1050,7 +1059,7 @@
     source-map "^0.6.1"
     write-file-atomic "^3.0.0"
 
-"@jest/types@^27.1.1", "@jest/types@^27.2.5":
+"@jest/types@^27.0.2", "@jest/types@^27.1.1", "@jest/types@^27.2.5":
   version "27.2.5"
   resolved "https://registry.yarnpkg.com/@jest/types/-/types-27.2.5.tgz#420765c052605e75686982d24b061b4cbba22132"
   integrity sha512-nmuM4VuDtCZcY+eTpw+0nvstwReMsjPoj7ZR80/BbixulhLaiX+fbv8oeLW8WZlJMcsGQsTmMKT/iTZu1Uy/lQ==
@@ -2137,10 +2146,10 @@
   resolved "https://registry.yarnpkg.com/@types/babel__code-frame/-/babel__code-frame-7.0.3.tgz#eda94e1b7c9326700a4b69c485ebbc9498a0b63f"
   integrity sha512-2TN6oiwtNjOezilFVl77zwdNPwQWaDBBCCWWxyo1ctiO3vAtd7H/aB/CBJdw9+kqq3+latD0SXoedIuHySSZWw==
 
-"@types/babel__core@^7.0.0", "@types/babel__core@^7.1.14":
-  version "7.1.16"
-  resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.16.tgz#bc12c74b7d65e82d29876b5d0baf5c625ac58702"
-  integrity sha512-EAEHtisTMM+KaKwfWdC3oyllIqswlznXCIVCt7/oRNrh+DhgT4UEBNC/jlADNjvw7UnfbcdkGQcPVZ1xYiLcrQ==
+"@types/babel__core@*", "@types/babel__core@^7.0.0", "@types/babel__core@^7.1.14":
+  version "7.1.14"
+  resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.14.tgz#faaeefc4185ec71c389f4501ee5ec84b170cc402"
+  integrity sha512-zGZJzzBUVDo/eV6KgbE0f0ZI7dInEYvo12Rb70uNQDshC3SkRMb67ja0GgRHZgAX3Za6rhaWlvbDO8rrGyAb1g==
   dependencies:
     "@babel/parser" "^7.1.0"
     "@babel/types" "^7.0.0"
@@ -3907,7 +3916,7 @@ didyoumean@^1.2.1:
   resolved "https://registry.yarnpkg.com/didyoumean/-/didyoumean-1.2.2.tgz#989346ffe9e839b4555ecf5666edea0d3e8ad037"
   integrity sha512-gxtyfqMg7GKyhQmb056K7M3xszy/myH8w+B4RT+QXBQsvAOdc3XymqDDPHx1BgPgsdAA5SIifona89YtRATDzw==
 
-diff-sequences@^27.0.6:
+diff-sequences@^27.0.1, diff-sequences@^27.0.6:
   version "27.0.6"
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-27.0.6.tgz#3305cb2e55a033924054695cc66019fd7f8e5723"
   integrity sha512-ag6wfpBFyNXZ0p8pcuIDS//D8H062ZQJ3fzYxjpmeKjnz8W4pekL3AI8VohmyZmsWW2PWaHgjsmqR6L13101VQ==
@@ -4229,7 +4238,7 @@ eslint-plugin-simple-import-sort@^7.0.0:
   resolved "https://registry.yarnpkg.com/eslint-plugin-simple-import-sort/-/eslint-plugin-simple-import-sort-7.0.0.tgz#a1dad262f46d2184a90095a60c66fef74727f0f8"
   integrity sha512-U3vEDB5zhYPNfxT5TYR7u01dboFZp+HNpnGhkDB2g/2E4wZ/g1Q9Ton8UwCLfRV9yAKyYqDh62oHOamvkFxsvw==
 
-eslint-scope@^5.1.1:
+eslint-scope@^5.1.0, eslint-scope@^5.1.1:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-5.1.1.tgz#e786e59a66cb92b3f6c1fb0d508aab174848f48c"
   integrity sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==
@@ -4264,7 +4273,7 @@ eslint-visitor-keys@^1.1.0, eslint-visitor-keys@^1.3.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz#30ebd1ef7c2fdff01c3a4f151044af25fab0523e"
   integrity sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==
 
-eslint-visitor-keys@^2.0.0:
+eslint-visitor-keys@^2.0.0, eslint-visitor-keys@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-2.1.0.tgz#f65328259305927392c938ed44eb0a5c9b2bd303"
   integrity sha512-0rSmRBzXgDzIsD6mGdJgevzgezI534Cer5L/vyMX0kHzT/jiB43jRhd9YUlMGYLQy2zprNmoT8qasCGtY+QaKw==
@@ -4474,7 +4483,7 @@ expand-tilde@^2.0.0, expand-tilde@^2.0.2:
   dependencies:
     homedir-polyfill "^1.0.1"
 
-expect@^27.3.1:
+expect@^27.0.2, expect@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/expect/-/expect-27.3.1.tgz#d0f170b1f5c8a2009bab0beffd4bb94f043e38e7"
   integrity sha512-MrNXV2sL9iDRebWPGOGFdPQRl2eDQNu/uhxIMShjjx74T6kC6jFIkmQ6OqXDtevjGUkyB2IT56RzDBqXf/QPCg==
@@ -6076,7 +6085,7 @@ jest-config@^27.3.1:
     micromatch "^4.0.4"
     pretty-format "^27.3.1"
 
-jest-diff@^27.0.0, jest-diff@^27.3.1:
+jest-diff@*, jest-diff@^27.0.0, jest-diff@^27.0.2, jest-diff@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-27.3.1.tgz#d2775fea15411f5f5aeda2a5e02c2f36440f6d55"
   integrity sha512-PCeuAH4AWUo2O5+ksW4pL9v5xJAcIKPUPfIhZBcG1RKv/0+dvaWTQK1Nrau8d67dp65fOqbeMdoil+6PedyEPQ==
@@ -6129,12 +6138,12 @@ jest-environment-node@^27.2.2, jest-environment-node@^27.3.1:
     jest-mock "^27.3.0"
     jest-util "^27.3.1"
 
-jest-get-type@^27.0.6, jest-get-type@^27.3.1:
+jest-get-type@^27.0.1, jest-get-type@^27.0.6, jest-get-type@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-27.3.1.tgz#a8a2b0a12b50169773099eee60a0e6dd11423eff"
   integrity sha512-+Ilqi8hgHSAdhlQ3s12CAVNd8H96ZkQBfYoXmArzZnOfAtVAJEiPDBirjByEblvG/4LPJmkL+nBqPO3A1YJAEg==
 
-jest-haste-map@^27.2.2, jest-haste-map@^27.3.1:
+jest-haste-map@^27.0.2, jest-haste-map@^27.2.2, jest-haste-map@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-27.3.1.tgz#7656fbd64bf48bda904e759fc9d93e2c807353ee"
   integrity sha512-lYfNZIzwPccDJZIyk9Iz5iQMM/MH56NIIcGj7AFU1YyA4ewWFBl8z+YPJuSCRML/ee2cCt2y3W4K3VXPT6Nhzg==
@@ -6186,7 +6195,7 @@ jest-leak-detector@^27.3.1:
     jest-get-type "^27.3.1"
     pretty-format "^27.3.1"
 
-jest-matcher-utils@^27.3.1:
+jest-matcher-utils@^27.0.2, jest-matcher-utils@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-27.3.1.tgz#257ad61e54a6d4044e080d85dbdc4a08811e9c1c"
   integrity sha512-hX8N7zXS4k+8bC1Aj0OWpGb7D3gIXxYvPNK1inP5xvE4ztbz3rc4AkI6jGVaerepBnfWB17FL5lWFJT3s7qo8w==
@@ -6196,7 +6205,7 @@ jest-matcher-utils@^27.3.1:
     jest-get-type "^27.3.1"
     pretty-format "^27.3.1"
 
-jest-message-util@^27.3.1:
+jest-message-util@^27.0.2, jest-message-util@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-message-util/-/jest-message-util-27.3.1.tgz#f7c25688ad3410ab10bcb862bcfe3152345c6436"
   integrity sha512-bh3JEmxsTZ/9rTm0jQrPElbY2+y48Rw2t47uMfByNyUVR+OfPh4anuyKsGqsNkXk/TI4JbLRZx+7p7Hdt6q1yg==
@@ -6254,7 +6263,7 @@ jest-resolve@27.2.2:
     resolve "^1.20.0"
     slash "^3.0.0"
 
-jest-resolve@^27.2.2, jest-resolve@^27.3.1:
+jest-resolve@^27.0.2, jest-resolve@^27.2.2, jest-resolve@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-resolve/-/jest-resolve-27.3.1.tgz#0e5542172a1aa0270be6f66a65888647bdd74a3e"
   integrity sha512-Dfzt25CFSPo3Y3GCbxynRBZzxq9AdyNN+x/v2IqYx6KVT5Z6me2Z/PsSGFSv3cOSUZqJ9pHxilao/I/m9FouLw==
@@ -6338,7 +6347,7 @@ jest-serializer@^27.0.6:
     "@types/node" "*"
     graceful-fs "^4.2.4"
 
-jest-snapshot@^27.0.2, jest-snapshot@^27.3.1:
+jest-snapshot@*, jest-snapshot@^27.0.2, jest-snapshot@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-snapshot/-/jest-snapshot-27.3.1.tgz#1da5c0712a252d70917d46c037054f5918c49ee4"
   integrity sha512-APZyBvSgQgOT0XumwfFu7X3G5elj6TGhCBLbBdn3R1IzYustPGPE38F51dBWMQ8hRXa9je0vAdeVDtqHLvB6lg==
@@ -6387,7 +6396,7 @@ jest-util@27.2.0:
     is-ci "^3.0.0"
     picomatch "^2.2.3"
 
-jest-util@^27.0.0, jest-util@^27.2.0, jest-util@^27.3.1:
+jest-util@^27.0.0, jest-util@^27.0.2, jest-util@^27.2.0, jest-util@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-27.3.1.tgz#a58cdc7b6c8a560caac9ed6bdfc4e4ff23f80429"
   integrity sha512-8fg+ifEH3GDryLQf/eKZck1DEs2YuVPBCMOaHQxVVLmQwl/CDhWzrvChTX4efLZxGrw+AA0mSXv78cyytBt/uw==
@@ -8109,7 +8118,7 @@ prettier@*, prettier@2.4.1:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.1.tgz#671e11c89c14a4cfc876ce564106c4a6726c9f5c"
   integrity sha512-9fbDAXSBcc6Bs1mZrDYb3XKzDLm4EXXL9sC1LqKP5rZkT6KRr/rf9amVUcODVXgguK/isJz0d0hP72WeaKWsvA==
 
-pretty-format@*, pretty-format@^27.0.0, pretty-format@^27.2.2, pretty-format@^27.3.1:
+pretty-format@*, pretty-format@^27.0.0, pretty-format@^27.0.2, pretty-format@^27.2.2, pretty-format@^27.3.1:
   version "27.3.1"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-27.3.1.tgz#7e9486365ccdd4a502061fa761d3ab9ca1b78df5"
   integrity sha512-DR/c+pvFc52nLimLROYjnXPtolawm+uWDxr4FjuLDLUn+ktWnSN851KoHwHzzqq6rfCOjkzN8FLgDrSub6UDuA==