[mrober]

Prior to the 4.4.0 Kotlin rewrite, the plugin could be applied to com.android.library modules. The rewrite dropped that support because the new Variant API's LibraryVariant has no applicationId, which the plugin used to select the matching client entry in the google-services.json file

This change restores library support by using the library's namespace as the package_name key instead, which is effectively the same value the legacy plugin matched on

This lets library modules generate Firebase resources without a consuming app, e.g. a library's own instrumentation tests that need to initialize Firebase, instead of forcing a throwaway app module solely to host google-services.json. Resources generated in a library merge into dependent apps with normal AGP precedence, so the app's own values always win

[rlazo]

Some general feedback:

• Add a description to the PR to know why the change is necessary
• Bump the plugin's minor version since it's a "new feature"
• Update the README.md file to reflect the support for libraries

[kaibolay]

LGTM