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Alex Hunt ffe3f79495 Standardize secondary package READMEs (#57273)
Summary:
Pull Request resolved: https://github.com/react/react-native/pull/57273

**Motivation**

A README is the first thing an npm visitor sees on each package; internal-repo boilerplate like the "Testing" sections and the "We're using yarn…" note doesn't belong on a published package page.

**Changes**

- Standardize every README: a `# react-native/<name>` heading, a user-facing description, and a blue version badge plus a green monthly-downloads badge.
- Keep the "internal dependency" prelude only on `community-cli-plugin`, `virtualized-lists`, and `js-polyfills`.
- Drop the monorepo-template "Testing" sections and yarn note.
- Rework `metro-config` around the Configuring Metro guide; add missing READMEs for `metro-babel-transformer` and `popup-menu-android`.

Changelog: [Internal]

Reviewed By: emily8rown

Differential Revision: D109017270

fbshipit-source-id: 6208294c4ad2e6235a6605ae54f22d730f0476e7
2026-06-18 07:04:44 -07:00
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@react-native/js-polyfills

npm npm downloads

This is an internal dependency of React Native. Please don't depend on it directly.

JavaScript environment polyfills set up by React Native at startup (e.g. Promise, timers, and other runtime globals).