Dart Macros — Compile-time Code Generation Without Build Runner

Dart Macros — Compile-time Code Generation Without Build Runner Dart 3.4 (Flutter 3.22) introduced Dart Macros as an experimental feature: compile-time code generation that works without build_runner . A single annotation can auto-generate fromJson / toJson , copyWith , or Equatable -style equality — all processed directly by the compiler. What Are Dart Macros? Key Differences from build_runner Traditional build_runner -based code generation has two pain points: Slow build steps : You must manua