Property "watcher.unstable_workerThreads" shows warning message when running Metro about metro

[robhogan]

Hi @krisisav

Upgraded @react-native/metro-config dependency to latest version: 0.73.2

You don't mention your React Native version but this looks like the problem - the config you're referring to is new, and not yet available in the version of Metro used by any stable release of react-native. Apologies for the confusion. Please use a version with a minor matching whatever version of react-native you're using (e.g., if you're on react-native 0.72.x, use @react-native/metro-config@^0.72.0), or let us know if you are on a 0.73 RC.

CC @huntie for process follow-ups next half:

• These packages shouldn't be tagged latest and shouldn't have stable releases before 0.73 final (12k downloads of @react-native/metro-config 0.74.0 must be causing issues for folks somewhere).
• More generally, if we don't want folks to use @react-native/foo@^0.X.0 with react-native@^0.Y.0, we should be enforcing that with a runtime check and/or peerDependencies.

[krisisav]

Thank you for the fast response @robhogan
Indeed, we are using react-native v0.72.7
Seems good to note here though: before our latest dependency upgrades, we used to have react-native v0.72.5 in combination with @react-native/metro-config v0.73.2 (so no major updates were applied)

[robhogan]

We used to have react-native v0.72.5 in combination with @react-native/metro-config v0.73.2 (so no major updates were applied)

Indeed, YMMV when using non-matching versions - 0.73.x isn't guaranteed to be compatible with 0.72.y, but might happen to be compatible for some patch versions, particularly early ones close to the cut. You can think of the minor bump as "dropping support" for the previous release line, after which we're free to make changes that actually break compatibility with it.

In general with React Native you should ensure that any @react-native/* dependencies are aligned with react-native in their minor (middle) version - that's the context in which they're developed and tested.