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Eslint Plugin: Add TypeScript as peer dependency and make it optional #29942

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merged 6 commits into from
Mar 19, 2021

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sarayourfriend
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@sarayourfriend sarayourfriend commented Mar 17, 2021

Description

Adds an explicit dependency on TypeScript to eslint-plugin.

See #29940 for details.

Fixes #29940

How has this been tested?

  1. Checkout this branch
  2. Run npm run build
  3. Follow the reproduction steps in Error: Failed to load plugin '@typescript-eslint' declared in '--config » plugin:@wordpress/recommended': Cannot find module 'typescript' #29940 but point scripts to file:../gutenberg/packages/scripts (assuming gutenberg lives in the same repository as the test folder for the test package.json)
    For example:
{
  "name": "ts",
  "version": "0.0.0",
  "description": "",
  "main": "index.js",
  "author": "",
  "license": "private",
  "devDependencies": {
    "@wordpress/scripts": "file:../gutenberg/packages/scripts"
  }
}

There should be no errors when running npx wp-scripts lint-js index.js

You must npm install in your test directory before running npx ...

Types of changes

Bug fix

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • [N/A] My code follows the accessibility standards.
  • [N/A] I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • [N/A] I've updated all React Native files affected by any refactorings/renamings in this PR.

@sarayourfriend sarayourfriend added the [Tool] ESLint plugin /packages/eslint-plugin label Mar 17, 2021
@sarayourfriend sarayourfriend self-assigned this Mar 17, 2021
@sarayourfriend sarayourfriend marked this pull request as ready for review March 17, 2021 17:56
@gziolo
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gziolo commented Mar 17, 2021

Huh, this is what I see at https://www.npmjs.com/package/typescript

Screen Shot 2021-03-17 at 18 58 16

I guess we can't do much about it.

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Size Change: 0 B

Total Size: 1.4 MB

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ocean90 commented Mar 17, 2021

Is it possible to create a config which treats *.js and *.ts files separately so we can make TS a peer dependency like eslint? Maybe at least until TS is more common in the project?

Basically if a project has no *.ts files don't require TS to be installed.

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sirreal commented Mar 17, 2021

Is it possible to create a config which treats *.js and *.ts files separately so we can make TS a peer dependency like eslint? Maybe at least until TS is more common in the project?

Basically if a project has no *.ts files don't require TS to be installed.

This is worth exploring, it seems like a straightforward way to address the issue.

@gziolo gziolo changed the title eslint-plugin: Add explicit dependency on TypeScript Eslint Plugin: Add TypeScript as peer dependency and make it optional Mar 18, 2021
@gziolo gziolo force-pushed the fix/missing-ts-dependency branch from 4ff7935 to ae544e9 Compare March 18, 2021 09:37
@gziolo gziolo added the [Type] Bug An existing feature does not function as intended label Mar 18, 2021
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gziolo commented Mar 18, 2021

@sirreal and @ocean90 - I applied some iterations to this PR and now TypeScript should be optional, at least with npm 6. I think npm 7 installs peer dependencies by default so we can look at the proposed approach separately to address it.

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gziolo commented Mar 18, 2021

This is interesting way to declare peer dependencies:
https://github.com/typescript-eslint/typescript-eslint/blob/9ed3c5020cf390f7f26cdb24638c222fc0383647/packages/parser/package.json#L58-L62

"peerDependenciesMeta": {
    "typescript": {
      "optional": true
    }
  },

@gziolo gziolo self-assigned this Mar 18, 2021
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I would appreciate some sanity check from someone else since I added most of the code changes 😅

I plan to cherry-pick this PR and publish to npm as soon as it gets accepted.

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ocean90 commented Mar 18, 2021

Based on the comment npm/cli#1247 (comment), I think the peerDependenciesMeta is required so that npm v7 doesn't auto-resolve optional peerDependencies?

This is different for eslint which is a required peer dependency.

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gziolo commented Mar 18, 2021

Based on the comment npm/cli#1247 (comment), I think the peerDependenciesMeta is required so that npm v7 doesn't auto-resolve optional peerDependencies?

This is different for eslint which is a required peer dependency.

Yes, it looks like you are correct and it was implemented as noted it npm/rfcs#221.

Detailed documentation is here:
https://docs.npmjs.com/cli/v7/configuring-npm/package-json#peerdependenciesmeta

@gziolo gziolo force-pushed the fix/missing-ts-dependency branch from bea9962 to ef5c6ca Compare March 18, 2021 10:55
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gziolo commented Mar 18, 2021

typescript is now marked for npm 7+ as optional with ef5c6ca.

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Tested with and without TS and it's working as expected, should be good to merge.

@gziolo gziolo merged commit f790903 into trunk Mar 19, 2021
@gziolo gziolo deleted the fix/missing-ts-dependency branch March 19, 2021 07:15
@github-actions github-actions bot added this to the Gutenberg 10.3 milestone Mar 19, 2021
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gziolo commented Mar 19, 2021

Thank you all for help 🙇🏻

gziolo added a commit that referenced this pull request Mar 19, 2021
…#29942)

* Add explicit dependency on TypeScript

* Move typescript to a peer dependency

* Run TypeScript validation only when it is installed

* ESLint Pluging: Add the changelog entry

* Clarify the TS integration in the README file

* Mark typescript as an optional peer dependency

Co-authored-by: Grzegorz Ziolkowski <[email protected]>
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