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This is basically the implementation for the prerender pass. Instead of forking basically the whole implementation for prerender, I just add a conditional field on the request. If it's `null` it behaves like before. If it's non-`null` then instead of triggering client rendered boundaries it triggers those into a "postponed" state which is basically just a variant of "pending". It's supposed to be filled in later. It also builds up a serializable tree of which path can be followed to find the holes. This is basically a reverse `KeyPath` tree. It is unfortunate that this approach adds more code to the regular Fizz builds but in practice. It seems like this side is not going to add much code and we might instead just want to merge the builds so that it's smaller when you have `prerender` and `resume` in the same bundle - which I think will be common in practice. This just implements the prerender side, and not the resume side, which is why the tests have a TODO. That's in a follow up PR.
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.