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Server Functions can be stringified (sometimes implicitly) when passed as data. This adds an override to hide the source code in that case - just in case someone puts sensitive information in there. Note that this still preserves the `name` field but this is also available on the export but in practice is likely minified anyway. There's nothing else on these referenes we'd consider unsafe unless you explicitly expose expandos which are part of the `"use server"` export. This adds a safety check to ensure you don't encode cyclic Promises. This isn't a parser bug per se. Promises do have a safety mechanism that avoids them infinite looping. However, since we use custom Thenables, what can happen is that every time a native Promise awaits it, another Promise wrapper is created around the Thenable which foils the ECMAScript Promise cycle detection which can lead to an infinite loop. This also ensures that embedded `ReadableStream` and `AsyncIterable` streams are properly closed if the source stream closes early both on the Server and Client. This doesn't cause an infinite loop but just to make sure resource clean up can proceed properly. We're also adding some more explicit clear errors for invalid payloads since we no longer need to obfuscate the original issue.
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.