[react] Add v18 fork for TS 5.0 and below

[eps1lon]

If microsoft/TypeScript#51328 ships we want to take advantage of it immediately. We could just add JSX.ElementType now but this would leave us in an awkward spot where you couldn't use React.FC to return all the valid things from render. So I'd rather make a clear cut where we consider TS 5.1. + React 18 types fixed. Supporting all other combinations would add a lot of work and this way we have another carrot for people to update TypeScript and React (especially because the biggest motivator is only in React 18 anyway: Server Components).

We can leverage the fork for other things as well (e.g. adding data-${string} props to HTML attributes).

[DangerBotOSS]

Inspecting the JavaScript source for this package found some properties that are not in the .d.ts files.
The check for missing properties isn't always right, so take this list as advice, not a requirement.

react (unpkg)

was missing the following properties:

1. unstable_act

Generated by 🚫 dangerJS against ec5d954

[eps1lon]

required by dtslint:

$ npm run test react

> definitely-typed@0.0.3 test
> node --require source-map-support/register node_modules/@definitelytyped/dtslint/ types react

dtslint@0.0.159
AssertionError [ERR_ASSERTION]: "types" in '/home/eps1lon/Development/forks/DefinitelyTyped/types/react/package.json' should be "index".
    at checkPackageJson (/home/eps1lon/Development/forks/DefinitelyTyped/node_modules/@definitelytyped/dtslint/src/checks.ts:27:12)
    at runTests (/home/eps1lon/Development/forks/DefinitelyTyped/node_modules/@definitelytyped/dtslint/src/index.ts:167:5)
    at main (/home/eps1lon/Development/forks/DefinitelyTyped/node_modules/@definitelytyped/dtslint/src/index.ts:83:5)

[typescript-bot]

@eps1lon Thank you for submitting this PR!

This is a live comment which I will keep updated.

1 package in this PR

• react — on npm, on unpkg (author is owner)
  • Config files to check:
    • react/package.json: not the expected form and not moving towards it (check: exports)
    • react/ts5.0/.eslintrc.json: edited
    • react/ts5.0/OTHER_FILES.txt: not the expected form
    • react/ts5.0/tsconfig.json: not the expected form (check: compilerOptions.exactOptionalPropertyTypes)
    • react/ts5.0/tslint.json: not the expected form (check: rules)

Code Reviews

Because this is a widely-used package, a DT maintainer will need to review it before it can be merged.

You can test the changes of this PR in the Playground.

Status

• ✅ No merge conflicts
• ✅ Continuous integration tests have passed
• 🕐 A DT maintainer needs to approve changes which affect module config files

Once every item on this list is checked, I'll ask you for permission to merge and publish the changes.

---

Diagnostic Information: What the bot saw about this PR

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[typescript-bot]

🔔 @johnnyreilly @bbenezech @pzavolinsky @ericanderson @DovydasNavickas @theruther4d @guilhermehubner @ferdaber @jrakotoharisoa @pascaloliv @Hotell @franklixuefei @Jessidhia @saranshkataria @lukyth @zieka @dancerphil @dimitropoulos @disjukr @vhfmag @hellatan @priyanshurav @Semigradsky — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[eps1lon]

Landing now to test infra. As long as we don't rely on newer TS features we can always bump the max version of the fork later.

[johnnyreilly]

Nice work!