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Replace no-shadow eslint rule with @typescript-eslint/no-shadow#38665

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kevin940726 merged 3 commits intotrunkfrom
eslint/switch-to-ts-noshadow
Feb 10, 2022
Merged

Replace no-shadow eslint rule with @typescript-eslint/no-shadow#38665
kevin940726 merged 3 commits intotrunkfrom
eslint/switch-to-ts-noshadow

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@adamziel
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@adamziel adamziel commented Feb 9, 2022

Description

At the moment, declaring any typescript enum triggers the following eslint error:

ESLint: 'Status' is already declared in the upper scope on line 1 column 13.(no-shadow)

You can confirm that by creating a status.ts file somewhere in the repo and pasting the following contents:

export enum Status {
	Idle = 'IDLE',
	Resolving = 'RESOLVING',
	Error = 'ERROR',
	Success = 'SUCCESS',
}

The StackOverflow discussion reveals there is a dedicated no-shadow rule for typescript code called @typescript-eslint/no-shadow:

https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/no-shadow.md#how-to-use

And so I propose we use that rule instead.

Testing Instructions

  1. Confirm all the checks are green
  2. Confirm that @typescript-eslint/no-shadow covers the same cases as no-shadow

cc @gziolo @kevin940726 @youknowriad @jsnajdr

@adamziel adamziel added the Developer Experience Ideas about improving block and theme developer experience label Feb 9, 2022
@adamziel adamziel self-assigned this Feb 9, 2022
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github-actions bot commented Feb 9, 2022

Size Change: +62 B (0%)

Total Size: 1.14 MB

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@gziolo gziolo left a comment

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While it works for Gutenberg, we could also do the same instead for the ESLint plugin we expose for 3rd party projects. There is a similar case we did for another rule:

rules: {
'no-duplicate-imports': 'off',
'@typescript-eslint/no-duplicate-imports': 'error',

It only uses this different rule when a project has TS installed, which is true for Gutenberg.

@gziolo gziolo added [Type] Code Quality Issues or PRs that relate to code quality [Type] Automated Testing Testing infrastructure changes impacting the execution of end-to-end (E2E) and/or unit tests. labels Feb 9, 2022
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adamziel commented Feb 9, 2022

Sounds good @gziolo – I just did that.

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Awesome, thank you!

Let's add an entry to the CHANGELOG before merging:
https://github.com/WordPress/gutenberg/blob/trunk/packages/eslint-plugin/CHANGELOG.md

@gziolo gziolo added the [Tool] ESLint plugin /packages/eslint-plugin label Feb 9, 2022
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Love it ♥️ !

@kevin940726 kevin940726 merged commit 9ecf5fc into trunk Feb 10, 2022
@kevin940726 kevin940726 deleted the eslint/switch-to-ts-noshadow branch February 10, 2022 02:27
@github-actions github-actions bot added this to the Gutenberg 12.7 milestone Feb 10, 2022
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