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### Changes made: - Running with enableFizzExternalRuntime (feature flag) and unstable_externalRuntimeSrc (param) will generate html nodes with data attributes that encode Fizz instructions. ``` <div hidden data-rxi="" data-bid="param0" data-dgst="param1" ></div> ``` - Added an external runtime browser script `ReactDOMServerExternalRuntime`, which processes and removes these nodes - This runtime should be passed as to renderInto[...] via `unstable_externalRuntimeSrc` - Since this runtime is render blocking (for all streamed suspense boundaries and segments), we want this to reach the client as early as possible. By default, Fizz will send this script at the end of the shell when it detects dynamic content (e.g. suspenseful pending tasks), but it can be sent even earlier by calling `preinit(...)` inside a component. - The current implementation relies on Float to dedupe sending `unstable_externalRuntimeSrc`, so `enableFizzExternalRuntime` is only valid when `enableFloat` is also set.
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.