[wp-trac] [WordPress Trac] #64662: Add TypeScript static analysis for core JavaScript files

[WordPress Trac]

#64662: Add TypeScript static analysis for core JavaScript files
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 Reporter:  westonruter       |       Owner:  (none)
     Type:  task (blessed)    |      Status:  new
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:                    |     Focuses:  javascript
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Description changed by westonruter:

Old description:

> For #64661, a [https://github.com/WordPress/wordpress-develop/pull/10900
> PR] is proposed which adds TypeScript checking for the scripts related to
> the CodeMirror code editor integrations. With that in place, core should
> start expanding the scope of which JS files are checked to ensure code
> quality and fix subtle bugs. The same is being done for PHP with PHPStan
> in #61175.
>
> Note that TypeScript is already being used in Gutenberg. See
> https://make.wordpress.org/core/2021/03/18/proposal-native-typescript-
> support-in-gutenberg/

New description:

 For #64661, a [https://github.com/WordPress/wordpress-develop/pull/10900
 PR] is proposed which adds TypeScript checking for the scripts related to
 the CodeMirror code editor integrations. With that in place, core should
 start expanding the scope of which JS files are checked to ensure code
 quality and fix subtle bugs. The same is being done for PHP with PHPStan
 in #61175.

 Note that TypeScript is already being used in Gutenberg. See
 https://make.wordpress.org/core/2021/03/18/proposal-native-typescript-
 support-in-gutenberg/

 To do:

 1. Commit https://github.com/WordPress/wordpress-develop/pull/10900
 2. Add `typecheck:js` to the `precommit` Grunt task.
 3. Add GHA workflow which runs `typecheck:js`

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Ticket URL: <https://core.trac.wordpress.org/ticket/64662#comment:1>
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