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Alex Hunt
6cfde8f296
Summary: Pull Request resolved: https://github.com/react/react-native/pull/57369 **Problem** The separate `react-native/assets-registry` package includes a longstanding ecosystem footgun. `registry.js` holds asset state in a module-scoped variable, which makes the package a stateful singleton: exactly one instance must exist per JS runtime, or registration and lookup diverge. We provide no guarantee that this singleton requirement holds: - The install layout — how the package manager dedupes packages in `node_modules` — decides how many copies exist, and `react-native`'s exact-version pin means third-party ranges never dedupe against it. Effects: - **Consumers silently break**: `expo-asset` and `expo-image` can land on a second copy: assets register in one, resolve as `undefined` from the other. Expo neutralizes this with a shim in `expo/cli` that redirects every registry import to a single virtual module — bare React Native + Metro has no such protection. - **This blocks 1.0**: The ecosystem can't move from exact-version lockstep to semver ranges until stateful packages like the asset registry are safe to duplicate. Today, relaxing the pin would turn a latent footgun into a common one. **To solve this**, move towards (but not quite yet) deleting `react-native/assets-registry`, in favour of a replacement `AssetRegistry` API offered directly by `react-native`. **Key changes** NOTE: **Reviewer note**: Browsing file changes on GitHub may be more focused — https://github.com/react/react-native/pull/57369/changes NOTE: Squash of https://github.com/react/react-native/pull/57233 (D108750302) and https://github.com/react/react-native/pull/57232 (D108750303) `'react-native'`: - Add new `AssetRegistry` API, along with the `PackagerAsset` and `AssetDestPathResolver` root type exports in `react-native`. - Add a new `'react-native/asset-registry'` secondary entry point — intended for Metro's `transformer.assetRegistryPath` config contract. `react-native/assets-registry`: - Update to source from this relocated implementation — fixing the duplicate install layout bug (where apps/frameworks enforce a single copy of `react-native`). **Impact** - **✅ Fixed**: Imports from either `react-native` or `react-native/assets-registry` in RN 0.87+ will be durable to duplicate package installs — Expo can remove their virtual module shim. - **✅ Fixed**: Deep import `'react-native/Libraries/Image/AssetRegistry'` dependency removed (migrated in `react-native/metro-config`). Changelog: - [General][Fixed] - **assets-registry**: `react-native/assets-registry` now shares state across duplicate installs, sourcing from a relocated implementation in the `react-native` package - [General][Added] - Add `AssetRegistry` API (replaces `react-native/assets-registry/registry`) - [General][Breaking] - `react-native/Libraries/Image/AssetRegistry` is removed. Please use the `AssetRegistry` API (apps/library code) and/or the `react-native/asset-registry` entrypoint (Metro/build configs). Reviewed By: robhogan Differential Revision: D109019622 fbshipit-source-id: 75599a94a9aba084a1266f2128c448379d1596cd