Dart Macros — Compile-time Code Generation Without Build Runner

📰 Dev.to · kanta13jp1

Learn how to use Dart Macros for compile-time code generation without Build Runner, streamlining your development process in Dart 3.4 and Flutter 3.22.

intermediate Published 29 Apr 2026
Action Steps
  1. Install Dart 3.4 or later to access the experimental Dart Macros feature
  2. Use the `@jsonSerializable` annotation to auto-generate `fromJson` and `toJson` methods
  3. Apply the `@immutable` annotation to generate `copyWith` methods
  4. Utilize the `@equatable` annotation to generate equality checks
  5. Experiment with different annotations to explore their capabilities and limitations
Who Needs to Know This

Developers working with Dart and Flutter can benefit from using Dart Macros to automate repetitive coding tasks, improving productivity and reducing errors.

Key Insight

💡 Dart Macros enable compile-time code generation, allowing for automated creation of boilerplate code such as serialization and equality checks.

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🚀 Boost your #Dart and #Flutter productivity with Dart Macros! 🚀

Key Takeaways

Learn how to use Dart Macros for compile-time code generation without Build Runner, streamlining your development process in Dart 3.4 and Flutter 3.22.

Full Article

Title: Dart Macros — Compile-time Code Generation Without Build Runner

URL Source: https://dev.to/kanta13jp1/dart-macros-compile-time-code-generation-without-build-runner-1p35

Published Time: 2026-04-29T08:47:58Z

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# Dart Macros — Compile-time Code Generation Without Build Runner - DEV Community
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Posted on Apr 29

# Dart Macros — Compile-time Code Generation Without Build Runner

[#flutter](https://dev.to/t/flutter)[#dart](https://dev.to/t/dart)[#webdev](https://dev.to/t/webdev)[#indiedev](https://dev.to/t/indiedev)

# [](https://dev.to/kanta13jp1/dart-macros-compile-time-code-generation-without-build-runner-1p35#dart-macros-compiletime-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.

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