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This adds a new top level API for hydrating a root. It takes the initial children as part of its constructor. These are unlike other render calls in that they have to represent what the server sent and they can't be batched with other updates. I also changed the options to move the hydrationOptions to the top level since now these options are all hydration options. I kept the createRoot one just temporarily to make it easier to codemod internally but I'm doing a follow up to delete. As part of this I un-dried a couple of paths. ReactDOMLegacy was intended to be built on top of the new API but it didn't actually use those root APIs because there are special paths. It also doesn't actually use most of the commmon paths since all the options are ignored. It also made it hard to add only warnings for legacy only or new only code paths. I also forked the create/hydrate paths because they're subtly different since now the options are different. The containers are also different because I now error for comment nodes during hydration which just doesn't work at all but eventually we'll error for all createRoot calls. After some iteration it might make sense to break out some common paths but for now it's easier to iterate on the duplicates.
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.transform-error-messagesis a Babel pass that rewrites error messages to IDs for a production (minified) build.