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* Print built-in specific error message for toJSON This is a better message for Date. Also, format the message to highlight the affected prop. * Describe error messages using JSX elements in DEV We don't have access to the grand parent objects on the stack so we stash them on weakmaps so we can access them while printing error messages. Might be a bit slow. * Capitalize Server/Client Component * Special case errror messages for children of host components These are likely meant to be text content if they're not a supported object. * Update error messages
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.