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The runtime contains a type check to determine if a user-provided ref is a valid type — a function or object (or a string, when `disableStringRefs` is off). This currently happens during child reconciliation. This changes it to happen only when the ref is passed to the component that the ref is being attached to. This is a continuation of the "ref as prop" change — until you actually pass a ref to a HostComponent, class, etc, ref is a normal prop that has no special behavior.
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.