lints

depend_on_referenced_packages fires when a file imports or exports a package that is not listed in your own pubspec.yaml, even if it resolves through another dependency. Here is exactly what the rule checks on Dart 3.12.2 and Flutter 3.44.8, why transitive imports are a real bug, and how to fix each variant.

unawaited_futures only looks inside async bodies, discarded_futures only inside sync bodies, and both miss arrow functions, tear-offs, and collection literals. Measured case by case on Dart 3.12.2 and Flutter 3.44.8, with the analysis_options.yaml I recommend.