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We have changed the shape (and the runtime) of React Elements. To help avoid precompiled or inlined JSX having subtle breakages or deopting hidden classes, I renamed the symbol so that we can early error if private implementation details are used or mismatching versions are used. Why "transitional"? Well, because this is not the last time we'll change the shape. This is just a stepping stone to removing the `ref` field on the elements in the next version so we'll likely have to do it again.
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.