The power of Macros in Dart
summary
Dart macros let code annotate a class and immediately get working fromJson/toJson and copyWith methods without running build_runner; the demo shows a JSON macro producing methods at edit time but requiring experimental VM and analyzer flags and a VS Code extension. Macros run in three-phase execution (type, declaration, definition), augment declarations in real time, remove separate generated files, and aim to replace JSON_serializable/freezed workflows while still being experimental.
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chapters (10)
- 0:00Dart macros intro
- 1:03Introduction
- 2:29Motivation for macros
- 6:23Current code generation
- 13:09What are macros
- 14:59Macros use cases
- 17:08JSON serialization demo
- 21:47How macros work
- 24:16Macro execution order
- 26:43Conclusions
