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This PR moves `flushSync` out of the reconciler. there is still an internal implementation that is used when these semantics are needed for React methods such as `unmount` on roots. This new isomorphic `flushSync` is only used in builds that no longer support legacy mode. Additionally all the internal uses of flushSync in the reconciler have been replaced with more direct methods. There is a new `updateContainerSync` method which updates a container but forces it to the Sync lane and flushes passive effects if necessary. This combined with flushSyncWork can be used to replace flushSync for all instances of internal usage. We still maintain the original flushSync implementation as `flushSyncFromReconciler` because it will be used as the flushSync implementation for FB builds. This is because it has special legacy mode handling that the new isomorphic implementation does not need to consider. It will be removed from production OSS builds by closure though
The error code system substitutes React's error messages with error IDs to provide a better debugging support in production. Check out the blog post here.
codes.jsoncontains the mapping from IDs to error messages. This file is generated by the Gulp plugin and is used by both the Babel plugin and the error decoder page in our documentation. This file is append-only, which means an existing code in the file will never be changed/removed.extract-errors.jsis an node script that traverses our codebase and updatescodes.json. You can test it by runningyarn extract-errors. It works by crawling the build artifacts directory, so you need to have either run the build script or downloaded pre-built artifacts (e.g. withyarn download build). It works with partial builds, too.transform-error-messagesis a Babel pass that rewrites error messages to IDs for a production (minified) build.