Dart Macros — Compile-time Code Generation Without Build Runner
Dart 3.4 introduces macros as an experimental feature for compile-time code generation, eliminating the need for build_runner and reducing build times. These macros can automatically generate boilerplate code such as fromJson/toJson methods, copyWith functions, and value equality logic directly in the compiler. This results in cleaner projects with immediate IDE support and no generated files.
- ▪Dart Macros are integrated into the Dart compiler and do not require a separate build step like build_runner.
- ▪The @JsonCodable macro automatically generates JSON serialization and deserialization code without producing .g.dart files.
- ▪Custom macros can be created using interfaces like ClassDeclarationsMacro to generate methods such as copyWith or value equality checks.
- ▪Macros improve developer experience by enabling immediate IDE autocomplete and reducing project clutter from generated code.
- ▪As of Dart 3.4, macros are experimental but represent a shift toward more efficient, compile-time code generation in Dart and Flutter apps.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 801579) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } kanta13jp1 Posted on Apr 29 Dart Macros — Compile-time Code Generation Without Build Runner #dart #flutter #webdev #indiedev 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.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
Discussion
0 commentsMore from DEV.to (Top)
