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We introduced the `unstable_useContextWithBailout` API to run compiler based experiments. This API was designed to be an experiment proxy for alternative approaches which would be heavier to implement. The experiment turned out to be inconclusive. Since most of our performance critical usage is already optimized, we weren't able to find a clear win with this approach. Since we don't have further plans for this API, let's clean it up.
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.