fixes #40314 - index.flow.js

[aswinandro]

fixes #40314 - index.flow.js - Added Index.flow.js for MacOS Systems

Summary:

Changelog:

Add index.js.flow to npm package files for Flow support

Currently, the distributed npm package for react-native does not include the index.js.flow file, which causes all exports to be typed as any when using Flow. This commit adds index.js.flow to the "files" array in package.json, ensuring Flow users receive proper type definitions out of the box. This addresses issues where type checking with Flow fails in React Native projects.

FIXED - Message

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Test Plan:

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[huntie]

@aswinandro Hey! Happy to accept this. But what I would say too is we haven't been considering our open source support for React Native + Flow as supported for a couple of years 😅

• This does mean that on upgrading to 0.79 and 0.80, we made quite a lot of internal type changes — including the new index.js.flow entry point, but also many changes to our Flow type shapes to align better with TypeScript/source. So, you'll need to keep up with these and there were several breaking changes 🙏🏻
• Do consider migrating projects to TypeScript for long term support.

See also #51556 recently.

[facebook-github-bot]

@huntie has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[huntie]

Wait, we cannot accept any of the file changes to index.js.flow itself — please update to include only the package.json change.

[huntie]

Replaced by #51908.