fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values #6432

cparros · 2023-02-07T01:05:36Z

PR Checklist

Addresses an existing open issue: fixes Bug: [no-unnecessary-condition] Does not account for optional chaining on potentially-void values #6261
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

This PR adds a check for void types in the [no-unnecessary-condition] rule. It also adds a valid test case to its valid tests array.

typescript-eslint · 2023-02-07T01:05:38Z

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codecov · 2023-02-07T01:20:15Z

Codecov Report

Merging #6432 (c63f694) into main (3e102fe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6432   +/-   ##
=======================================
  Coverage   91.53%   91.53%           
=======================================
  Files         371      371           
  Lines       12662    12663    +1     
  Branches     3721     3721           
=======================================
+ Hits        11590    11591    +1     
  Misses        754      754           
  Partials      318      318

Flag	Coverage Δ
unittest	`91.53% <100.00%> (+<0.01%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...slint-plugin/src/rules/no-unnecessary-condition.ts	`98.34% <100.00%> (+<0.01%)`	⬆️

JoshuaKGoldberg

A good start - glad it's only a little bit of code to fix the bug! Let's get it to even less. 🚀

JoshuaKGoldberg · 2023-02-07T16:27:14Z

packages/eslint-plugin/tests/rules/no-unnecessary-condition.test.ts

+    `
+let variable = 'abc' as string | void;
+variable?.[0];
+    `,


I looked around the test file and found a few similar tests. Example: let foo: undefined | { bar: true };. Could you move this near them?

JoshuaKGoldberg · 2023-02-07T16:48:49Z

packages/eslint-plugin/src/rules/no-unnecessary-condition.ts

      return (
        isTypeAnyType(type) ||
        isTypeUnknownType(type) ||
-        (isNullableType(type, { allowUndefined: true }) && isOwnNullable)
+        (isNullableType(type, { allowUndefined: true }) && isOwnNullable) ||
+        (possiblyVoid && isOwnNullable)


The && isOwnNullable is duplicated here. Let's simplify:

(isOwnNullable && (isNullableType(type, { allowUndefined: true }) || possiblyVoid))

JoshuaKGoldberg · 2023-02-07T16:53:15Z

packages/eslint-plugin/src/rules/no-unnecessary-condition.ts

+      const unionParts = unionTypeParts(type);
+      const possiblyVoid = unionParts.some(
+        part => part.flags & ts.TypeFlags.Void,
+      );
      return (
        isTypeAnyType(type) ||
        isTypeUnknownType(type) ||


Interesting: isTypeAnyType(type) and isTypeUnknownType(type)both are working fine even if the type is a union. Both of those functions narrow down to checkingisTypeFlagSet(type, ts.TypeFlags.Something)`.

I tried switching from the possiblyVoid variable to checking isTypeFlagSet(type, ts.TypeFlags.Void - and it seems to work! So I think my hunch about using unionTypeParts was wrong 😄.

Tip: TypeScript's flags enums such as ts.TypeFlags work with checks like isTypeFlagSet(type, ts.TypeFlags.One | ts.TypeFlags.Two). So you should be able to replace isTypeAnyType(type) || isTypeUnknownType(type) with a single isTypeFlagSet check.

This is great to know! Done.

bradzacher

this is looking good to me!
thanks for fixing this!

stale

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint) | devDependencies | minor | [`5.51.0` -> `5.52.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2feslint-plugin/5.51.0/5.52.0) | | [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint) | devDependencies | minor | [`5.51.0` -> `5.52.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2fparser/5.51.0/5.52.0) | --- ### Release Notes <details> <summary>typescript-eslint/typescript-eslint (@typescript-eslint/eslint-plugin)</summary> ### [`v5.52.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#5520-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5510v5520-2023-02-13) [Compare Source](typescript-eslint/typescript-eslint@v5.51.0...v5.52.0) ##### Bug Fixes - **eslint-plugin:** \[no-import-type-side-effects] correctly ignore zero-specifier imports ([#6444](typescript-eslint/typescript-eslint#6444)) ([d5a6688](typescript-eslint/typescript-eslint@d5a6688)) - **eslint-plugin:** \[no-unnecessary-condition] account for optional chaining on potentially void values ([#6432](typescript-eslint/typescript-eslint#6432)) ([e1d9c67](typescript-eslint/typescript-eslint@e1d9c67)), closes [#5255](typescript-eslint/typescript-eslint#5255) - **eslint-plugin:** \[no-unnecessary-condition] fix false positive when checking indexed access types ([#6452](typescript-eslint/typescript-eslint#6452)) ([d569924](typescript-eslint/typescript-eslint@d569924)) - **eslint-plugin:** fix key-spacing when type starts on next line ([#6412](typescript-eslint/typescript-eslint#6412)) ([3eb2eed](typescript-eslint/typescript-eslint@3eb2eed)) ##### Features - **eslint-plugin:** \[block-spacing] extending base rule for TS related blocks ([#6195](typescript-eslint/typescript-eslint#6195)) ([b2db3f5](typescript-eslint/typescript-eslint@b2db3f5)) - **eslint-plugin:** \[explicit-function-return-type] add allowFunctionsWithoutTypeParameters option ([#6105](typescript-eslint/typescript-eslint#6105)) ([113640e](typescript-eslint/typescript-eslint@113640e)) - **eslint-plugin:** \[explicit-function-return-type] add allowIIFEs option ([#6237](typescript-eslint/typescript-eslint#6237)) ([a1b3f7b](typescript-eslint/typescript-eslint@a1b3f7b)) </details> <details> <summary>typescript-eslint/typescript-eslint (@typescript-eslint/parser)</summary> ### [`v5.52.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/parser/CHANGELOG.md#5520-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5510v5520-2023-02-13) [Compare Source](typescript-eslint/typescript-eslint@v5.51.0...v5.52.0) **Note:** Version bump only for package [@typescript-eslint/parser](https://github.com/typescript-eslint/parser) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1784 Reviewed-by: Epsilon_02 <epsilon_02@noreply.codeberg.org> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>

cparros added 2 commits February 5, 2023 22:07

Update error message per typescript-eslint#5255 discussion

f68b09f

Add void check to no-unnecessary-condition and test case

25ccd33

cparros changed the title ~~fix(eslint-plugin):[no-unnecessary-condition] void check and test~~ feat(eslint-plugin): [no-unnecessary-condition] void check and test Feb 7, 2023

cparros changed the title ~~feat(eslint-plugin): [no-unnecessary-condition] void check and test~~ feat(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values Feb 7, 2023

JoshuaKGoldberg previously requested changes Feb 7, 2023

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JoshuaKGoldberg added the awaiting response Issues waiting for a reply from the OP or another party label Feb 7, 2023

Cleanup, update type checks

c63f694

bradzacher added enhancement New feature or request awaiting response Issues waiting for a reply from the OP or another party and removed awaiting response Issues waiting for a reply from the OP or another party labels Feb 10, 2023

bradzacher approved these changes Feb 10, 2023

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bradzacher added bug Something isn't working and removed enhancement New feature or request awaiting response Issues waiting for a reply from the OP or another party labels Feb 10, 2023

bradzacher changed the title ~~feat(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values~~ fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values Feb 10, 2023

bradzacher requested a review from JoshuaKGoldberg February 10, 2023 04:16

bradzacher added this pull request to the merge queue Feb 10, 2023

Merged via the queue into typescript-eslint:main with commit e1d9c67 Feb 10, 2023

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fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values #6432

fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values #6432

cparros commented Feb 7, 2023

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fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values #6432

fix(eslint-plugin): [no-unnecessary-condition] account for optional chaining on potentially void values #6432

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cparros commented Feb 7, 2023

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