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Stacked on top of #26735. This allows a framework to add a `$$FORM_ACTION` property to a function. This lets the framework return a set of props to use in place of the function but only during SSR. Effectively, this lets you implement progressive enhancement of form actions using some other way instead of relying on the replay feature. This will be used by RSC on Server References automatically by convention in a follow up, but this mechanism can also be used by other frameworks/libraries.
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.