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* [Fizz/Float] Float for stylesheet resources This commit implements Float in Fizz and on the Client. The initial set of supported APIs is roughly 1. Convert certain stylesheets into style Resources when opting in with precedence prop 2. Emit preloads for stylesheets and explicit preload tags 3. Dedupe all Resources by href 4. Implement ReactDOM.preload() to allow for imperative preloading 5. Implement ReactDOM.preinit() to allow for imperative preinitialization Currently supports 1. style Resources (link rel "stylesheet") 2. font Resources (preload as "font") later updates will include support for scripts and modules
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.