Asset paths
Reads flutter.assets from pubspec.yaml and writes assets.gen.dart. Bad paths fail at compile time.
Fast DevFlutter tooling for dev time
Lives in dev_dependencies. Typed asset paths from flutter.assets.
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Theme and locale
Fold light / dark and zh / en into one asset. Pick a path with of(context).
Your config
Put a fast_dev_config.yaml at the package root. Class name, style, and output stay in the repo.
CLI / build_runner
One package, two entry points, same result: dart run fast_dev gen, or build_runner.