backstage/.changeset/swift-phones-cheat.md

@backstage/cli

@backstage/cli
patch

Removed tsx and jsx as supported extensions in backend packages. For most repos, this will not have any effect. But if you inadvertently had added some tsx/jsx files to your backend package, you may now start to see code: 'MODULE_NOT_FOUND' errors when launching the backend locally. The reason for this is that the offending files get ignored during transpilation. Hence, the importing file can no longer find anything to import.

The fix is to rename any .tsx files in your backend packages to .ts instead, or .jsx to .js.