feat: Add support for TS config files #18134

aryaemami59 · 2024-02-21T16:50:08Z

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What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
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What changes did you make? (Give an overview)

This PR:

Adds support for TypeScript config files (eslint.config.ts, eslint.config.mts, eslint.config.cts)
Adds jiti as an optional peer dependency.
Conditionally imports jiti based on whether the config file's extension ends with ts.

I went through a lot of different possible ways of implementing it, and this by far seems to be the simplest way of doing it without changing too much of the internals of the package or adding too many dependencies.

Is there anything you'd like reviewers to focus on?

eslint-github-bot · 2024-02-21T16:50:13Z

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linux-foundation-easycla · 2024-02-21T16:50:14Z

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eslint-github-bot · 2024-02-21T16:50:53Z

Hi @aryaemami59!, thanks for the Pull Request

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lib/eslint/eslint.js

…onfig.ts

lib/eslint/eslint.js

…onfig.ts

cany748 · 2024-02-29T11:26:14Z

Wouldn't it be better to use Jiti for this? I think it's perfect for this, it's used in Nuxt and TailwindCSS to load configuration from Typescript files. It is much smaller and faster than Typescript.

…onfig.ts

aladdin-add · 2024-03-04T10:04:06Z

the first-class ts config support has been discussed in #12078 eslint/rfcs#50, and seems we didn't come to an agreement to accept it.

aladdin-add · 2024-03-04T10:48:35Z

it should be possible to use ts config in the current config. The easiest way I can think of is to use --config and --loader, something like:

NODE_OPTIONS=--loader=tsx eslint --config=eslint.config.ts xxx

…onfig.ts

aryaemami59 · 2024-03-06T04:31:30Z

@cany748 I had to research it to make sure it doesn't create import side effects. But it seems like you were right, it does what I wanted tsx to do without creating side effects.

aryaemami59 · 2024-03-06T04:43:02Z

@aladdin-add

it should be possible to use ts config in the current config. The easiest way I can think of is to use --config and --loader, something like:
NODE_OPTIONS=--loader=tsx eslint --config=eslint.config.ts xxx

That doesn't work you'll get:

Error: tsx must be loaded with --import instead of --loader

And if you use

NODE_OPTIONS=--import=tsx eslint --config=eslint.config.ts

you'll get a YAMLException error if you have a type annotation anywhere in the config file. And if you don't have a type annotation anywhere you'll still get this error:

Error: ESLint configuration in --config is invalid:
        - Property "" is the wrong type

aladdin-add · 2024-03-06T05:36:36Z

I mean flat config (which is the default in eslint v9). If you are using eslint v8, the default is eslintrc, and you need to specify ESLINT_USE_FLAT_CONFIG=true

aryaemami59 · 2024-03-06T05:50:56Z

@aladdin-add

I mean flat config (which is the default in eslint v9). If you are using eslint v8, the default is eslintrc, and you need to specify ESLINT_USE_FLAT_CONFIG=true

That still won't work with .mts or .cts extensions, it also doesn't respect the type field in package.json.

Out of curiosity what is your opinion in the current solution this PR provides?

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Zakas) - [`2d17453`](eslint/eslint@2d17453) feat: Implement modified cyclomatic complexity ([#18896](eslint/eslint#18896)) (Dmitry Pashkevich) #### Bug Fixes - [`ea380ca`](eslint/eslint@ea380ca) fix: Upgrade retry to avoid EMFILE errors ([#18986](eslint/eslint#18986)) (Nicholas C. Zakas) - [`fdd6319`](eslint/eslint@fdd6319) fix: Issues with type definitions ([#18940](eslint/eslint#18940)) (Arya Emami) #### Documentation - [`ecbd522`](eslint/eslint@ecbd522) docs: Mention code explorer ([#18978](eslint/eslint#18978)) (Nicholas C. Zakas) - [`7ea4ecc`](eslint/eslint@7ea4ecc) docs: Clarifying the Use of Meta Objects ([#18697](eslint/eslint#18697)) (Amaresh S M) - [`d3e4b2e`](eslint/eslint@d3e4b2e) docs: Clarify how to exclude `.js` files ([#18976](eslint/eslint#18976)) (Milos Djermanovic) - [`57232ff`](eslint/eslint@57232ff) docs: Mention plugin-kit in language docs ([#18973](eslint/eslint#18973)) (Nicholas C. Zakas) - [`b80ed00`](eslint/eslint@b80ed00) docs: Update README (GitHub Actions Bot) - [`cb69ab3`](eslint/eslint@cb69ab3) docs: Update README (GitHub Actions Bot) - [`7fb0d95`](eslint/eslint@7fb0d95) docs: Update README (GitHub Actions Bot) - [`493348a`](eslint/eslint@493348a) docs: Update README (GitHub Actions Bot) - [`87a582c`](eslint/eslint@87a582c) docs: fix typo in `id-match` rule ([#18944](eslint/eslint#18944)) (Jay) #### Chores - [`555aafd`](eslint/eslint@555aafd) chore: upgrade to `@eslint/js@9.12.0` ([#18987](eslint/eslint#18987)) (Francesco Trotta) - [`873ae60`](eslint/eslint@873ae60) chore: package.json update for [@eslint/js](https://github.com/eslint/js) release (Jenkins) - [`d0a5414`](eslint/eslint@d0a5414) refactor: replace strip-ansi with native module ([#18982](eslint/eslint#18982)) (Cristopher) - [`b827029`](eslint/eslint@b827029) chore: Enable JSON5 linting ([#18979](eslint/eslint#18979)) (Milos Djermanovic) - [`8f55ca2`](eslint/eslint@8f55ca2) chore: Upgrade espree, eslint-visitor-keys, eslint-scope ([#18962](eslint/eslint#18962)) (Nicholas C. Zakas) - [`c1a2725`](eslint/eslint@c1a2725) chore: update dependency mocha to ^10.7.3 ([#18945](eslint/eslint#18945)) (Milos Djermanovic) ##### [v9.11.1](eslint/eslint@v9.11.0...69e9459) ##### [v9.11.0](https://github.com/eslint/eslint/releases/tag/v9.11.0) #### Features - [`ec30c73`](eslint/eslint@ec30c73) feat: add "eslint/universal" to export `Linter` ([#18883](eslint/eslint#18883)) (唯然) - [`c591da6`](eslint/eslint@c591da6) feat: Add language to types ([#18917](eslint/eslint#18917)) (Nicholas C. Zakas) - [`492eb8f`](eslint/eslint@492eb8f) feat: limit the name given to `ImportSpecifier` in `id-length` ([#18861](eslint/eslint#18861)) (Tanuj Kanti) - [`19c6856`](eslint/eslint@19c6856) feat: Add `no-useless-constructor` suggestion ([#18799](eslint/eslint#18799)) (Jordan Thomson) - [`a48f8c2`](eslint/eslint@a48f8c2) feat: add type `FormatterFunction`, update `LoadedFormatter` ([#18872](eslint/eslint#18872)) (Francesco Trotta) #### Bug Fixes - [`5e5f39b`](eslint/eslint@5e5f39b) fix: add missing types for `no-restricted-exports` rule ([#18914](eslint/eslint#18914)) (Kristóf Poduszló) - [`8f630eb`](eslint/eslint@8f630eb) fix: add missing types for `no-param-reassign` options ([#18906](eslint/eslint#18906)) (Kristóf Poduszló) - [`d715781`](eslint/eslint@d715781) fix: add missing types for `no-extra-boolean-cast` options ([#18902](eslint/eslint#18902)) (Kristóf Poduszló) - [`2de5742`](eslint/eslint@2de5742) fix: add missing types for `no-misleading-character-class` options ([#18905](eslint/eslint#18905)) (Kristóf Poduszló) - [`c153084`](eslint/eslint@c153084) fix: add missing types for `no-implicit-coercion` options ([#18903](eslint/eslint#18903)) (Kristóf Poduszló) - [`fa11b2e`](eslint/eslint@fa11b2e) fix: add missing types for `no-empty-function` options ([#18901](eslint/eslint#18901)) (Kristóf Poduszló) - [`a0deed1`](eslint/eslint@a0deed1) fix: add missing types for `camelcase` options ([#18897](eslint/eslint#18897)) (Kristóf Poduszló) #### Documentation - [`e4e5709`](eslint/eslint@e4e5709) docs: correct `prefer-object-has-own` type definition comment ([#18924](eslint/eslint#18924)) (Nitin Kumar) - [`91cbd18`](eslint/eslint@91cbd18) docs: add unicode abbreviations in no-irregular-whitespace rule ([#18894](eslint/eslint#18894)) (Alix Royere) - [`59cfc0f`](eslint/eslint@59cfc0f) docs: clarify `resultsMeta` in `LoadedFormatter` type ([#18881](eslint/eslint#18881)) (Milos Djermanovic) - [`adcc50d`](eslint/eslint@adcc50d) docs: Update README (GitHub Actions Bot) - [`4edac1a`](eslint/eslint@4edac1a) docs: Update README (GitHub Actions Bot) #### Build Related - [`959d360`](eslint/eslint@959d360) build: Support updates to previous major versions ([#18871](eslint/eslint#18871)) (Milos Djermanovic) #### Chores - [`ca21a64`](eslint/eslint@ca21a64) chore: upgrade [@eslint/js](https://github.com/eslint/js)[@9](https://github.com/9).11.0 ([#18927](eslint/eslint#18927)) (Milos Djermanovic) - [`a10f90a`](eslint/eslint@a10f90a) chore: package.json update for [@eslint/js](https://github.com/eslint/js) release (Jenkins) - [`e4e02cc`](eslint/eslint@e4e02cc) refactor: Extract processor logic into ProcessorService ([#18818](eslint/eslint#18818)) (Nicholas C. Zakas) - [`6d4484d`](eslint/eslint@6d4484d) chore: updates for v8.57.1 release (Jenkins) - [`71f37c5`](eslint/eslint@71f37c5) refactor: use optional chaining when validating config rules ([#18893](eslint/eslint#18893)) (lucasrmendonca) - [`2c2805f`](eslint/eslint@2c2805f) chore: Add PR note to all templates ([#18892](eslint/eslint#18892)) (Nicholas C. Zakas) - [`7b852ce`](eslint/eslint@7b852ce) refactor: use `Directive` class from `@eslint/plugin-kit` ([#18884](eslint/eslint#18884)) (Milos Djermanovic) - [`d594ddd`](eslint/eslint@d594ddd) chore: update dependency [@eslint/core](https://github.com/eslint/core) to ^0.6.0 ([#18863](eslint/eslint#18863)) (renovate\[bot]) - [`78b2421`](eslint/eslint@78b2421) chore: Update change.yml ([#18882](eslint/eslint#18882)) (Nicholas C. Zakas) - [`a416f0a`](eslint/eslint@a416f0a) chore: enable `$ExpectType` comments in .ts files ([#18869](eslint/eslint#18869)) (Francesco Trotta) ##### [v9.10.0](eslint/eslint@v9.9.1...6448f32) ##### [v9.9.1](eslint/eslint@v9.9.0...8781e6f) ##### [v9.9.0](https://github.com/eslint/eslint/releases/tag/v9.9.0) #### Features - [`41d0206`](eslint/eslint@41d0206) feat: Add support for TS config files ([#18134](eslint/eslint#18134)) (Arya Emami) - [`3a4eaf9`](eslint/eslint@3a4eaf9) feat: add suggestion to `require-await` to remove `async` keyword ([#18716](eslint/eslint#18716)) (Dave) #### Documentation - [`9fe068c`](eslint/eslint@9fe068c) docs: how to author plugins with configs that extend other configs ([#18753](eslint/eslint#18753)) (Alec Gibson) - [`48117b2`](eslint/eslint@48117b2) docs: add version support page in the side navbar ([#18738](eslint/eslint#18738)) (Amaresh S M) - [`fec2951`](eslint/eslint@fec2951) docs: add version support page to the dropdown ([#18730](eslint/eslint#18730)) (Amaresh S M) - [`38a0661`](eslint/eslint@38a0661) docs: Fix typo ([#18735](eslint/eslint#18735)) (Zaina Al Habash) - [`3c32a9e`](eslint/eslint@3c32a9e) docs: Update yarn command for creating ESLint config ([#18739](eslint/eslint#18739)) (Temitope Ogunleye) - [`f9ac978`](eslint/eslint@f9ac978) docs: Update README (GitHub Actions Bot) #### Chores - [`461b2c3`](eslint/eslint@461b2c3) chore: upgrade to `@eslint/js@9.9.0` ([#18765](eslint/eslint#18765)) (Francesco Trotta) - [`59dba1b`](eslint/eslint@59dba1b) chore: package.json update for [@eslint/js](https://github.com/eslint/js) release (Jenkins) - [`fea8563`](eslint/eslint@fea8563) chore: update dependency [@eslint/core](https://github.com/eslint/core) to ^0.3.0 ([#18724](eslint/eslint#18724)) (renovate\[bot]) - [`aac191e`](eslint/eslint@aac191e) chore: update dependency [@eslint/json](https://github.com/eslint/json) to ^0.3.0 ([#18760](eslint/eslint#18760)) (renovate\[bot]) - [`b97fa05`](eslint/eslint@b97fa05) chore: update wdio dependencies for more stable tests ([#18759](eslint/eslint#18759)) (Christian Bromann) ##### [v9.8.0](eslint/eslint@v9.7.0...63881dc) ##### [v9.7.0](https://github.com/eslint/eslint/releases/tag/v9.7.0) #### Features - [`7bd9839`](eslint/eslint@7bd9839) feat: add support for es2025 duplicate named capturing groups ([#18630](eslint/eslint#18630)) (Yosuke Ota) - [`1381394`](eslint/eslint@1381394) feat: add `regex` option in `no-restricted-imports` ([#18622](eslint/eslint#18622)) (Nitin Kumar) #### Bug Fixes - [`14e9f81`](eslint/eslint@14e9f81) fix: destructuring in catch clause in `no-unused-vars` ([#18636](eslint/eslint#18636)) (Francesco Trotta) #### Documentation - [`9f416db`](eslint/eslint@9f416db) docs: Add Powered by Algolia label to the search. ([#18633](eslint/eslint#18633)) (Amaresh S M) - [`c8d26cb`](eslint/eslint@c8d26cb) docs: Open JS Foundation -> OpenJS Foundation ([#18649](eslint/eslint#18649)) (Milos Djermanovic) - [`6e79ac7`](eslint/eslint@6e79ac7) docs: `loadESLint` does not support option `cwd` ([#18641](eslint/eslint#18641)) (Francesco Trotta) #### Chores - [`793b718`](eslint/eslint@793b718) chore: upgrade [@eslint/js](https://github.com/eslint/js)[@9](https://github.com/9).7.0 ([#18680](eslint/eslint#18680)) (Francesco Trotta) - [`7ed6f9a`](eslint/eslint@7ed6f9a) chore: package.json update for [@eslint/js](https://github.com/eslint/js) release (Jenkins) - [`7bcda76`](eslint/eslint@7bcda76) refactor: Add type references ([#18652](eslint/eslint#18652)) (Nicholas C. Zakas) - [`51bf57c`](eslint/eslint@51bf57c) chore: add tech sponsors through actions ([#18624](eslint/eslint#18624)) (Strek) - [`6320732`](eslint/eslint@6320732) refactor: don't use `parent` property in `NodeEventGenerator` ([#18653](eslint/eslint#18653)) (Milos Djermanovic) - [`9e6d640`](eslint/eslint@9e6d640) refactor: move "Parsing error" prefix adding to Linter ([#18650](eslint/eslint#18650)) (Milos Djermanovic) ##### [v9.6.0](eslint/eslint@v9.5.0...473d1bb) ##### [v9.5.0](eslint/eslint@v9.4.0...5352357) ##### [v9.4.0](eslint/eslint@v9.3.0...a5f7e58) ##### [v9.3.0](eslint/eslint@v9.2.0...41a871c) ##### [v9.2.0](eslint/eslint@v9.1.1...271e7ab) ##### [v9.1.1](eslint/eslint@v9.1.0...b4d2512) ##### [v9.1.0](eslint/eslint@v9.0.0...b78d831) ##### [v9.0.0](eslint/eslint@v8.57.0...e0cbc50)

aryaemami59 added 2 commits February 20, 2024 03:21

Initial working implementation of TS config files

eac9360

Simplify implementation

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github-actions bot added cli Relates to ESLint's command-line interface core Relates to ESLint's core APIs and features labels Feb 21, 2024

aryaemami59 changed the title ~~Add support for TypeScript config files (eslint.config.ts, eslint.config.mts, eslint.config.cts)~~ feat: Add support for TypeScript config files (eslint.config.ts, eslint.config.mts, eslint.config.cts) Feb 21, 2024

aryaemami59 changed the title ~~feat: Add support for TypeScript config files (eslint.config.ts, eslint.config.mts, eslint.config.cts)~~ feat: Add support for TS config files Feb 21, 2024

eslint-github-bot bot added the feature This change adds a new feature to ESLint label Feb 21, 2024

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aryaemami59 added 3 commits February 23, 2024 13:42

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

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…onfig.ts

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

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…onfig.ts

Use typescript's transpile() instead of tsx to avoid side effects

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aryaemami59 commented Feb 27, 2024

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aryaemami59 added 2 commits February 27, 2024 18:59

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

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…onfig.ts

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

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…onfig.ts

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

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…onfig.ts

aryaemami59 added 3 commits March 5, 2024 13:48

Merge branch 'main' of https://github.com/eslint/eslint into eslint.c…

a016dff

…onfig.ts

Remove unnecessary nullish coalescing

00af268

Use jiti instead of TypeScript

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benedictleejh mentioned this pull request Jan 14, 2025

Add support for TypeScript configuration files stylelint/stylelint#4940

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fasttime mentioned this pull request Aug 19, 2025

feat!: drop support for jiti < 2.2.0 #20016

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