Use case

This originally came up at Dart-Code/Dart-Code#6073. Using Flutterfire with Swift Package Manager results in Dart files in the build/ folder which the analysis server analyzes, producing (potentially large numbers of) spurious analysis errors.

It doesn't make sense to analyze things in the build/ folder, but since this is a Flutter detail, it probably also does not make sense to code the exclusion into the analysis server.

Proposal

Include exclusions for any folders that Flutter creates that aren't expected to contain user-owned Dart files as exclusions in analysis_options.yaml for the flutter create templates:

analyzer:
  exclude:
    - build/