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Stacked on #25508 This PR adds meta tags as a resource type. metas are classified in the following priority 1. charset 2. http-equiv 3. property 4. name 5. itemprop when using property, there is special logic for og type properties where a `property="og:image:height"` following a `property="og:image"` will inherit the key of the previous tag. this relies on timing effects to stay consistent so when mounting new metas it is important that if structured properties are being used all members of a structure mount together. This is similarly true for arrays where the implicit sequential order defines the array structure. if you need an array you need to mount all array members in the same pass.
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.