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.
2 outlets in our directory ran this story, first to last over 1 hour. All of the coverage we found sits in one bucket: centre. That one-sidedness is itself worth noticing.
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Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/kanta13jp1/dart-macros-compile-time-code-generation-without-build-runner-1p35 |
| Publication time | Wed, 29 Apr 2026 08:47:58 +0000 |
| Retrieval time | 2026-04-29T09:06:54.500Z |
| Last seen | 2026-04-29T09:06:54.500Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | jZhJNwx1-WXt · 2 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
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.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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