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This extends the scope of the cache and fetch instrumentation using AsyncLocalStorage for microtasks. This is an intermediate step. It sets up the dispatcher only once. This is unique to RSC because it uses the react.shared-subset module for its shared state. Ideally we should support multiple renderers. We should also have this take over from an outer SSR's instrumented fetch. We should also be able to have a fallback to global state per request where AsyncLocalStorage doesn't exist and then the whole client-side solutions. I'm still figuring out the right wiring for that so this is a temporary hack.
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.