From 7c24670452c081c4229c53d075c28181684e2cb7 Mon Sep 17 00:00:00 2001
From: Curtis <curtis@qmarkc.com>
Date: Thu, 21 May 2020 15:43:29 -0500
Subject: [PATCH 1/6] chore(ts): init typescript conf + tsify
 tokenize-arg-string

---
 .editorconfig                                 |  12 ++
 .eslintrc                                     |  21 +++
 .gitignore                                    |   1 +
 .mocharc.json                                 |   6 +
 .nycrc                                        |  13 ++
 index.js                                      |   2 +-
 ...e-arg-string.js => tokenize-arg-string.ts} |  10 +-
 package.json                                  |  36 ++++-
 test/tokenize-arg-string.js                   |  70 ---------
 test/tokenize-arg-string.ts                   | 133 ++++++++++++++++++
 tsconfig.json                                 |  15 ++
 tsconfig.test.json                            |  10 ++
 12 files changed, 246 insertions(+), 83 deletions(-)
 create mode 100644 .editorconfig
 create mode 100644 .eslintrc
 create mode 100644 .mocharc.json
 create mode 100644 .nycrc
 rename lib/{tokenize-arg-string.js => tokenize-arg-string.ts} (78%)
 delete mode 100644 test/tokenize-arg-string.js
 create mode 100644 test/tokenize-arg-string.ts
 create mode 100644 tsconfig.json
 create mode 100644 tsconfig.test.json

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..4039ff11
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 00000000..5ce8c64a
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,21 @@
+{
+  "overrides": [
+    {
+      "files": "*.ts",
+      "parser": "@typescript-eslint/parser",
+      "rules": {
+        "no-unused-vars": "off",
+        "no-useless-constructor": "off",
+        "@typescript-eslint/no-unused-vars": "error",
+        "@typescript-eslint/no-useless-constructor": "error"
+      }
+    }
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2017,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint/eslint-plugin"
+  ]
+}
diff --git a/.gitignore b/.gitignore
index a7502d1d..791cb484 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .idea
+build/
 .nyc_output
 node_modules
 .DS_Store
diff --git a/.mocharc.json b/.mocharc.json
new file mode 100644
index 00000000..ef1c3645
--- /dev/null
+++ b/.mocharc.json
@@ -0,0 +1,6 @@
+{
+  "spec": [
+    "build/test",
+    "test"
+  ]
+}
diff --git a/.nycrc b/.nycrc
new file mode 100644
index 00000000..89f6c3a0
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,13 @@
+{
+  "exclude": [
+    "build/test/**",
+    "test/**"
+  ],
+  "reporter": [
+    "html",
+    "text"
+  ],
+  "lines": 100,
+  "branches": "97",
+  "statements": "100"
+}
diff --git a/index.js b/index.js
index c14c1fc7..bd3e282e 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,7 @@
 const camelCase = require('camelcase')
 const decamelize = require('decamelize')
 const path = require('path')
-const tokenizeArgString = require('./lib/tokenize-arg-string')
+const { tokenizeArgString } = require('./build/lib/tokenize-arg-string')
 const util = require('util')
 
 function parse (args, opts) {
diff --git a/lib/tokenize-arg-string.js b/lib/tokenize-arg-string.ts
similarity index 78%
rename from lib/tokenize-arg-string.js
rename to lib/tokenize-arg-string.ts
index 260c67c1..52827080 100644
--- a/lib/tokenize-arg-string.js
+++ b/lib/tokenize-arg-string.ts
@@ -1,5 +1,5 @@
 // take an un-split argv string and tokenize it.
-module.exports = function (argString) {
+export function tokenizeArgString (argString: string | any[]): string[] {
   if (Array.isArray(argString)) {
     return argString.map(e => typeof e !== 'string' ? e + '' : e)
   }
@@ -7,10 +7,10 @@ module.exports = function (argString) {
   argString = argString.trim()
 
   let i = 0
-  let prevC = null
-  let c = null
-  let opening = null
-  const args = []
+  let prevC: string | null = null
+  let c: string | null = null
+  let opening: string | null = null
+  const args: string[] = []
 
   for (let ii = 0; ii < argString.length; ii++) {
     prevC = c
diff --git a/package.json b/package.json
index 636ff176..d872f7c3 100644
--- a/package.json
+++ b/package.json
@@ -4,10 +4,14 @@
   "description": "the mighty option parser used by yargs",
   "main": "index.js",
   "scripts": {
-    "fix": "standard --fix",
-    "test": "c8 --reporter=text --reporter=html  mocha test/*.js",
-    "posttest": "standard",
-    "coverage": "c8 report --check-coverage check-coverage --lines=100 --branches=97 --statements=100"
+    "fix": "standardx --fix && standardx --fix **/*.ts",
+    "pretest": "npm run compile -- -p tsconfig.test.json",
+    "test": "c8 --reporter=text --reporter=html mocha test/*.js",
+    "posttest": "npm run check",
+    "coverage": "c8 report --check-coverage",
+    "check": "standardx && standardx **/*.ts",
+    "compile": "rimraf build && tsc",
+    "prepare": "npm run compile"
   },
   "repository": {
     "type": "git",
@@ -27,20 +31,38 @@
   "author": "Ben Coe <ben@npmjs.com>",
   "license": "ISC",
   "devDependencies": {
+    "@types/chai": "^4.2.11",
+    "@types/mocha": "^7.0.2",
+    "@types/node": "^10.0.3",
+    "@typescript-eslint/eslint-plugin": "^2.25.0",
+    "@typescript-eslint/parser": "^2.25.0",
     "c8": "^7.0.1",
     "chai": "^4.2.0",
+    "eslint": "^7.0.0",
+    "eslint-plugin-import": "^2.20.1",
+    "eslint-plugin-node": "^11.0.0",
+    "gts": "^2.0.0-alpha.4",
     "mocha": "^7.0.0",
-    "standard": "^14.3.1"
+    "rimraf": "^3.0.2",
+    "standardx": "^5.0.0",
+    "typescript": "^3.7.0"
   },
   "dependencies": {
     "camelcase": "^5.0.0",
     "decamelize": "^1.2.0"
   },
   "files": [
-    "lib",
-    "index.js"
+    "index.js",
+    "build",
+    "lib/**/*.js"
   ],
   "engines": {
     "node": ">=6"
+  },
+  "standardx": {
+    "ignore": [
+      "build",
+      "example.js"
+    ]
   }
 }
diff --git a/test/tokenize-arg-string.js b/test/tokenize-arg-string.js
deleted file mode 100644
index 2f35895c..00000000
--- a/test/tokenize-arg-string.js
+++ /dev/null
@@ -1,70 +0,0 @@
-/* global describe, it */
-
-const tokenizeArgString = require('../lib/tokenize-arg-string')
-
-require('chai').should()
-const expect = require('chai').expect
-
-describe('TokenizeArgString', function () {
-  it('handles unquoted string', function () {
-    const args = tokenizeArgString('--foo 99')
-    args[0].should.equal('--foo')
-    args[1].should.equal('99')
-  })
-
-  it('handles unquoted numbers', function () {
-    const args = tokenizeArgString(['--foo', 9])
-    args[0].should.equal('--foo')
-    args[1].should.equal('9')
-  })
-
-  it('handles quoted string with no spaces', function () {
-    const args = tokenizeArgString("--foo 'hello'")
-    args[0].should.equal('--foo')
-    args[1].should.equal("'hello'")
-  })
-
-  it('handles single quoted string with spaces', function () {
-    const args = tokenizeArgString("--foo 'hello world' --bar='foo bar'")
-    args[0].should.equal('--foo')
-    args[1].should.equal("'hello world'")
-    args[2].should.equal("--bar='foo bar'")
-  })
-
-  it('handles double quoted string with spaces', function () {
-    const args = tokenizeArgString('--foo "hello world" --bar="foo bar"')
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello world"')
-    args[2].should.equal('--bar="foo bar"')
-  })
-
-  it('handles single quoted empty string', function () {
-    const args = tokenizeArgString('--foo \'\' --bar=\'\'')
-    args[0].should.equal('--foo')
-    args[1].should.equal("''")
-    args[2].should.equal("--bar=''")
-  })
-
-  it('handles double quoted empty string', function () {
-    const args = tokenizeArgString('--foo "" --bar=""')
-    args[0].should.equal('--foo')
-    args[1].should.equal('""')
-    args[2].should.equal('--bar=""')
-  })
-
-  it('handles quoted string with embedded quotes', function () {
-    var args = tokenizeArgString('--foo "hello \'world\'" --bar=\'foo "bar"\'')
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello \'world\'"')
-    args[2].should.equal('--bar=\'foo "bar"\'')
-  })
-
-  // https://github.com/yargs/yargs-parser/pull/100
-  // https://github.com/yargs/yargs-parser/pull/106
-  it('ignores unneeded spaces', function () {
-    const args = tokenizeArgString('  foo  bar  "foo  bar"  ')
-    args[0].should.equal('foo')
-    expect(args[1]).equal('bar')
-    expect(args[2]).equal('"foo  bar"')
-  })
-})
diff --git a/test/tokenize-arg-string.ts b/test/tokenize-arg-string.ts
new file mode 100644
index 00000000..7621d45c
--- /dev/null
+++ b/test/tokenize-arg-string.ts
@@ -0,0 +1,133 @@
+/* global describe, it */
+import { expect, should } from 'chai'
+import { tokenizeArgString } from '../lib/tokenize-arg-string'
+
+should()
+
+describe('TokenizeArgString', function () {
+  it('handles unquoted string', function () {
+    const args = tokenizeArgString('--foo 99')
+    args[0].should.equal('--foo')
+    args[1].should.equal('99')
+  })
+
+  it('handles unquoted numbers', function () {
+    const args = tokenizeArgString(['--foo', 9])
+    args[0].should.equal('--foo')
+    args[1].should.equal('9')
+  })
+
+  it('handles quoted string with no spaces', function () {
+    const args = tokenizeArgString("--foo 'hello'")
+    args[0].should.equal('--foo')
+    args[1].should.equal("'hello'")
+  })
+
+  it('handles single quoted string with spaces', function () {
+    const args = tokenizeArgString("--foo 'hello world' --bar='foo bar'")
+    args[0].should.equal('--foo')
+    args[1].should.equal("'hello world'")
+    args[2].should.equal("--bar='foo bar'")
+  })
+
+  it('handles double quoted string with spaces', function () {
+    const args = tokenizeArgString('--foo "hello world" --bar="foo bar"')
+    args[0].should.equal('--foo')
+    args[1].should.equal('"hello world"')
+    args[2].should.equal('--bar="foo bar"')
+  })
+
+  it('handles single quoted empty string', function () {
+    const args = tokenizeArgString('--foo \'\' --bar=\'\'')
+    args[0].should.equal('--foo')
+    args[1].should.equal("''")
+    args[2].should.equal("--bar=''")
+  })
+
+  it('handles double quoted empty string', function () {
+    const args = tokenizeArgString('--foo "" --bar=""')
+    args[0].should.equal('--foo')
+    args[1].should.equal('""')
+    args[2].should.equal('--bar=""')
+  })
+
+  it('handles quoted string with embedded quotes', function () {
+    var args = tokenizeArgString('--foo "hello \'world\'" --bar=\'foo "bar"\'')
+    args[0].should.equal('--foo')
+    args[1].should.equal('"hello \'world\'"')
+    args[2].should.equal('--bar=\'foo "bar"\'')
+  })
+
+  // https://github.com/yargs/yargs-parser/pull/100
+  // https://github.com/yargs/yargs-parser/pull/106
+  it('ignores unneeded spaces', function () {
+    const args = tokenizeArgString('  foo  bar  "foo  bar"  ')
+    args[0].should.equal('foo')
+    expect(args[1]).equal('bar')
+    expect(args[2]).equal('"foo  bar"')
+  })
+
+  it('handles boolean options', function () {
+    const args = tokenizeArgString('--foo -bar')
+    expect(args[0]).to.equal(('--foo'))
+    expect(args[1]).to.equal(('-bar'))
+  })
+
+  it('handles empty string', function () {
+    const args = tokenizeArgString('')
+    expect(args.length).to.equal(0)
+  })
+
+  it('handles array with unquoted string', function () {
+    const args = tokenizeArgString(['--foo', '99'])
+    args[0].should.equal('--foo')
+    args[1].should.equal('99')
+  })
+
+  it('handles array with quoted string with no spaces', function () {
+    const args = tokenizeArgString(['--foo', "'hello'"])
+    args[0].should.equal('--foo')
+    args[1].should.equal("'hello'")
+  })
+
+  it('handles array with single quoted string with spaces', function () {
+    const args = tokenizeArgString(['--foo', "'hello world'", "--bar='foo bar'"])
+    args[0].should.equal('--foo')
+    args[1].should.equal("'hello world'")
+    args[2].should.equal("--bar='foo bar'")
+  })
+
+  it('handles array with double quoted string with spaces', function () {
+    const args = tokenizeArgString(['--foo', '"hello world"', '--bar="foo bar"'])
+    args[0].should.equal('--foo')
+    args[1].should.equal('"hello world"')
+    args[2].should.equal('--bar="foo bar"')
+  })
+
+  it('handles array with single quoted empty string', function () {
+    const args = tokenizeArgString(['--foo', "''", "--bar=''"])
+    args[0].should.equal('--foo')
+    args[1].should.equal("''")
+    args[2].should.equal("--bar=''")
+  })
+
+  it('handles array with double quoted empty string', function () {
+    const args = tokenizeArgString(['--foo', '""', '--bar=""'])
+    args[0].should.equal('--foo')
+    args[1].should.equal('""')
+    args[2].should.equal('--bar=""')
+  })
+
+  it('handles array with quoted string with embedded quotes', function () {
+    var args = tokenizeArgString(['--foo', '"hello \'world\'"', '--bar=\'foo "bar"\''])
+    args[0].should.equal('--foo')
+    args[1].should.equal('"hello \'world\'"')
+    args[2].should.equal('--bar=\'foo "bar"\'')
+  })
+
+  it('handles array with boolean options', function () {
+    const args = tokenizeArgString(['--foo', '-bar'])
+    expect(args[0]).to.equal('--foo')
+    expect(args[1]).to.equal('-bar')
+  })
+})
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..a6b82cad
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "extends": "./node_modules/gts/tsconfig-google.json",
+  "compilerOptions": {
+    "lib": [
+      "es2017"
+    ],
+    "outDir": "build",
+    "rootDir": ".",
+    "sourceMap": false,
+    "target": "es2017"
+  },
+  "include": [
+    "lib/**/*.ts"
+  ]
+}
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 00000000..75a19fe0
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "sourceMap": true
+  },
+  "include": [
+    "lib/**/*.ts",
+    "test/**/*.ts"
+  ]
+}

From 88fc8573a007c7668aa098ee1cd6bc3fdf9f0464 Mon Sep 17 00:00:00 2001
From: QmarkC <curtis.joe.berry@gmail.com>
Date: Wed, 3 Jun 2020 18:50:32 -0500
Subject: [PATCH 2/6] fix(deps): update dependency decamelize to v3 (#274)

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index d872f7c3..ae05049e 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
   },
   "dependencies": {
     "camelcase": "^5.0.0",
-    "decamelize": "^1.2.0"
+    "decamelize": "^3.2.0"
   },
   "files": [
     "index.js",

From 0c8001d581bb658d1b8d53318d24c474c36e3c89 Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Sat, 6 Jun 2020 10:11:10 -0700
Subject: [PATCH 3/6] build!: drops Node 6. begin following Node.js LTS
 schedule (#278)

---
 .github/workflows/ci.yaml |  2 +-
 README.md                 |  6 ++++++
 index.js                  | 13 ++++++++++++-
 package.json              |  2 +-
 test/yargs-parser.js      |  9 +++++++++
 5 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 82416464..0213d80f 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [8, 10, 12, 13]
+        node: [10, 12, 14]
     steps:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
diff --git a/README.md b/README.md
index bae61c2a..eff195c3 100644
--- a/README.md
+++ b/README.md
@@ -439,6 +439,12 @@ node example.js --unknown-option --known-option 2 --string-option --unknown-opti
 { _: ['--unknown-option'], knownOption: 2, stringOption: '--unknown-option2' }
 ```
 
+## Supported Node.js Versions
+
+Libraries in this ecosystem make a best effort to track
+[Node.js' release schedule](https://nodejs.org/en/about/releases/). Here's [a
+post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a).
+
 ## Special Thanks
 
 The yargs project evolves from optimist and minimist. It owes its
diff --git a/index.js b/index.js
index bd3e282e..4522fcc1 100644
--- a/index.js
+++ b/index.js
@@ -4,6 +4,17 @@ const path = require('path')
 const { tokenizeArgString } = require('./build/lib/tokenize-arg-string')
 const util = require('util')
 
+// See https://github.com/yargs/yargs-parser#supported-nodejs-versions for our
+// version support policy. The YARGS_MIN_NODE_VERSION is used for testing only.
+const minNodeVersion = (process && process.env && process.env.YARGS_MIN_NODE_VERSION)
+  ? Number(process.env.YARGS_MIN_NODE_VERSION) : 10
+if (process && process.version) {
+  const major = Number(process.version.match(/v([^.]+)/)[1])
+  if (major < minNodeVersion) {
+    throw Error(`yargs parser supports a minimum Node.js version of ${minNodeVersion}. Read our version support policy: https://github.com/yargs/yargs-parser#supported-nodejs-versions`)
+  }
+}
+
 function parse (args, opts) {
   opts = Object.assign(Object.create(null), opts)
   // allow a string argument to be passed in rather
@@ -626,8 +637,8 @@ function parse (args, opts) {
   }
 
   function applyEnvVars (argv, configOnly) {
+    if (!process) return
     if (typeof envPrefix === 'undefined') return
-
     const prefix = typeof envPrefix === 'string' ? envPrefix : ''
     Object.keys(process.env).forEach(function (envVar) {
       if (prefix === '' || envVar.lastIndexOf(prefix, 0) === 0) {
diff --git a/package.json b/package.json
index ae05049e..1928ad0e 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "lib/**/*.js"
   ],
   "engines": {
-    "node": ">=6"
+    "node": ">=10"
   },
   "standardx": {
     "ignore": [
diff --git a/test/yargs-parser.js b/test/yargs-parser.js
index f5cbc183..e017a08b 100644
--- a/test/yargs-parser.js
+++ b/test/yargs-parser.js
@@ -3823,4 +3823,13 @@ describe('yargs-parser', function () {
       }
     })
   })
+
+  it('throws error for unsupported Node.js versions', () => {
+    process.env.YARGS_MIN_NODE_VERSION = '55'
+    delete require.cache[require.resolve('../')]
+    expect(() => {
+      require('../')
+    }).to.throw(/yargs parser supports a minimum Node.js version of 55/)
+    delete process.env.YARGS_MIN_NODE_VERSION
+  })
 })

From 37e6354ffe7f3494383f135ea503d0af978573ca Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Sat, 6 Jun 2020 10:29:04 -0700
Subject: [PATCH 4/6] build: switch to release-please action (#280)

---
 .github/release-please.yml           |  2 --
 .github/workflows/release-please.yml | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)
 delete mode 100644 .github/release-please.yml
 create mode 100644 .github/workflows/release-please.yml

diff --git a/.github/release-please.yml b/.github/release-please.yml
deleted file mode 100644
index 3c065997..00000000
--- a/.github/release-please.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-releaseType: node
-handleGHRelease: true
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
new file mode 100644
index 00000000..70660547
--- /dev/null
+++ b/.github/workflows/release-please.yml
@@ -0,0 +1,14 @@
+on:
+   push:
+     branches:
+       - master
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: bcoe/release-please-action@v1.2.1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: node
+          package-name: yargs-parser

From 729ff4d37b093f67f66ed05c418eb9dc17919c7c Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Sat, 6 Jun 2020 10:38:05 -0700
Subject: [PATCH 5/6] feat(deps): update to latest camelcase/decamelize (#281)

---
 package.json | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index 1928ad0e..1b44cd1b 100644
--- a/package.json
+++ b/package.json
@@ -36,20 +36,20 @@
     "@types/node": "^10.0.3",
     "@typescript-eslint/eslint-plugin": "^2.25.0",
     "@typescript-eslint/parser": "^2.25.0",
-    "c8": "^7.0.1",
+    "c8": "^7.1.2",
     "chai": "^4.2.0",
     "eslint": "^7.0.0",
     "eslint-plugin-import": "^2.20.1",
     "eslint-plugin-node": "^11.0.0",
     "gts": "^2.0.0-alpha.4",
-    "mocha": "^7.0.0",
+    "mocha": "^7.2.0",
     "rimraf": "^3.0.2",
     "standardx": "^5.0.0",
     "typescript": "^3.7.0"
   },
   "dependencies": {
-    "camelcase": "^5.0.0",
-    "decamelize": "^3.2.0"
+    "camelcase": "^6.0.0",
+    "decamelize": "^4.0.0"
   },
   "files": [
     "index.js",

From b6b92375fc1e4ee2d2d6429cb84b08a14144efa9 Mon Sep 17 00:00:00 2001
From: Curtis <curtis@qmarkc.com>
Date: Tue, 9 Jun 2020 09:35:25 -0500
Subject: [PATCH 6/6] chore(ts): update ecmaVersion to match node v10 engine

---
 .eslintrc     | 2 +-
 tsconfig.json | 6 +-----
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/.eslintrc b/.eslintrc
index 5ce8c64a..ac6ca880 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -12,7 +12,7 @@
     }
   ],
   "parserOptions": {
-    "ecmaVersion": 2017,
+    "ecmaVersion": 2018,
     "sourceType": "module"
   },
   "plugins": [
diff --git a/tsconfig.json b/tsconfig.json
index a6b82cad..c28e1966 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,13 +1,9 @@
 {
   "extends": "./node_modules/gts/tsconfig-google.json",
   "compilerOptions": {
-    "lib": [
-      "es2017"
-    ],
     "outDir": "build",
     "rootDir": ".",
-    "sourceMap": false,
-    "target": "es2017"
+    "sourceMap": false
   },
   "include": [
     "lib/**/*.ts"