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class="detail-header -is-loose"><div class="detail-container"><div class="detail-header-outer-block"><div class="detail-header-content-block"><h1 class="title pub-monochrome-icon-hoverable">code_builder 4.10.1 <span class="pkg-page-title-copy"><img class="pub-monochrome-icon pkg-page-title-copy-icon filter-invert-on-dark" src="/static/hash-j60jq2j3/img/content-copy-icon.svg" alt="copy "code_builder: ^4.10.1" to clipboard" width="18" height="18" title="Copy "code_builder: ^4.10.1" to clipboard" data-copy-content="code_builder: ^4.10.1" data-ga-click-event="copy-package-version"/><div class="pkg-page-title-copy-feedback"><span class="code">code_builder: ^4.10.1</span> copied to clipboard</div></span></h1><div class="metadata">Published <span><a class="-x-ago" href="" title="Oct 29, 2024" role="button" data-timestamp="1730214758031">5 months ago</a></span> • <a class="-pub-publisher" href="/publishers/tools.dart.dev"><img class="-pub-publisher-shield filter-invert-on-dark" 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height="18"/></button><span class="likes-count"><span id="likes-count">242</span></span></div></div></div></div></div></div><div class="detail-container"><div class="detail-lead"><div class="detail-metadata-toggle"><div class="detail-metadata-toggle-icon">→</div><h3 class="detail-lead-title">Metadata</h3></div><p class="detail-lead-text">A fluent, builder-based library for generating valid Dart code.</p><p class="detail-lead-more"><a class="detail-metadata-toggle">More...</a></p></div></div><div class="detail-body"><div class="detail-tabs"><div class="detail-tabs-wide-header"><div class="detail-container"><ul class="detail-tabs-header"><li class="detail-tab tab-button detail-tab-readme-title -active">Readme</li><li class="detail-tab tab-link detail-tab-changelog-title"><a href="/packages/code_builder/changelog" role="button">Changelog</a></li><li class="detail-tab tab-link detail-tab-example-title"><a href="/packages/code_builder/example" role="button">Example</a></li><li class="detail-tab tab-link detail-tab-installing-title"><a href="/packages/code_builder/install" role="button">Installing</a></li><li class="detail-tab tab-link detail-tab-versions-title"><a href="/packages/code_builder/versions" role="button">Versions</a></li><li class="detail-tab tab-link detail-tab-analysis-title"><a href="/packages/code_builder/score" role="button">Scores</a></li></ul></div></div><div class="detail-container detail-body-main"><div class="detail-tabs-content"><section class="tab-content detail-tab-readme-content -active markdown-body"><p><a href="https://github.com/dart-lang/tools/actions/workflows/code_builder.yaml" rel="ugc"><img src="https://github.com/dart-lang/tools/actions/workflows/code_builder.yaml/badge.svg" alt="Build Status"></a> <a href="https://pub.dev/packages/code_builder"><img src="https://img.shields.io/pub/v/code_builder.svg" alt="Pub package"></a> <a href="https://pub.dev/packages/code_builder/publisher"><img src="https://img.shields.io/pub/publisher/code_builder.svg" alt="package publisher"></a> <a href="https://gitter.im/dart-lang/build" rel="ugc"><img src="https://badges.gitter.im/dart-lang/build.svg" alt="Gitter chat"></a></p> <p>A fluent, builder-based library for generating valid Dart code.</p> <h2 id="usage" class="hash-header">Usage <a href="#usage" class="hash-link">#</a></h2> <p><code>code_builder</code> has a narrow and user-friendly API.</p> <p>See the <code>example</code> and <code>test</code> folders for additional examples.</p> <p>For example creating a class with a method:</p> <pre><code class="language-dart">import 'package:code_builder/code_builder.dart'; import 'package:dart_style/dart_style.dart'; void main() { final animal = Class((b) => b ..name = 'Animal' ..extend = refer('Organism') ..methods.add(Method.returnsVoid((b) => b ..name = 'eat' ..body = const Code("print('Yum!');")))); final emitter = DartEmitter(); print( DartFormatter(languageVersion: DartFormatter.latestLanguageVersion) .format('${animal.accept(emitter)}'), ); } </code></pre> <p>Outputs:</p> <pre><code class="language-dart">class Animal extends Organism { void eat() => print('Yum!'); } </code></pre> <p>Have a complicated set of dependencies for your generated code? <code>code_builder</code> supports automatic scoping of your ASTs to automatically use prefixes to avoid symbol conflicts:</p> <pre><code class="language-dart">import 'package:code_builder/code_builder.dart'; import 'package:dart_style/dart_style.dart'; void main() { final library = Library((b) => b.body.addAll([ Method((b) => b ..body = const Code('') ..name = 'doThing' ..returns = refer('Thing', 'package:a/a.dart')), Method((b) => b ..body = const Code('') ..name = 'doOther' ..returns = refer('Other', 'package:b/b.dart')), ])); final emitter = DartEmitter.scoped(); print( DartFormatter(languageVersion: DartFormatter.latestLanguageVersion) .format('${library.accept(emitter)}'), ); } </code></pre> <p>Outputs:</p> <pre><code class="language-dart">import 'package:a/a.dart' as _i1; import 'package:b/b.dart' as _i2; _i1.Thing doThing() {} _i2.Other doOther() {} </code></pre> <h2 id="contributing" class="hash-header">Contributing <a href="#contributing" class="hash-link">#</a></h2> <ul> <li>Read and help us document common patterns over [in the docs][docs].</li> <li>Is there a <em>bug</em> in the code? <a href="https://github.com/dart-lang/tools/issues" rel="ugc">File an issue</a>.</li> </ul> <p>If a feature is missing (the Dart language is always evolving) or you'd like an easier or better way to do something, consider <a href="https://github.com/dart-lang/tools/pulls" rel="ugc">opening a pull request</a>. You can always <a href="https://github.com/dart-lang/tools/issues" rel="ugc">file an issue</a>, but generally speaking, feature requests will be on a best-effort basis.</p> <blockquote> <p><strong>NOTE</strong>: Due to the evolving Dart SDK the local <code>dartfmt</code> must be used to format this repository. You can run it simply from the command-line:</p> <pre><code class="language-sh">$ dart run dart_style:format -w . </code></pre> </blockquote> <h3 id="updating-generated-gdart-files" class="hash-header">Updating generated (<code>.g.dart</code>) files <a href="#updating-generated-gdart-files" class="hash-link">#</a></h3> <blockquote> <p><strong>NOTE</strong>: There is currently a limitation in <code>build_runner</code> that requires a workaround for developing this package since it is a dependency of the build system.</p> </blockquote> <p>Make a snapshot of the generated <a href="https://pub.dev/packages/build_runner"><code>build_runner</code></a> build script and run from the snapshot instead of from source to avoid problems with deleted files. These steps must be run without deleting the source files.</p> <pre><code class="language-bash">./tool/regenerate.sh </code></pre> </section></div></div></div><aside class="detail-info-box"><a class="packages-scores" href="/packages/code_builder/score"><div class="packages-score packages-score-like"><div class="packages-score-value -has-value"><span class="packages-score-value-number">242</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">likes</div></div><div class="packages-score packages-score-health"><div class="packages-score-value -has-value"><span class="packages-score-value-number">160</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">points</div></div><div class="packages-score packages-score-downloads" title="Number of downloads of this package during the past 30 days"><div class="packages-score-value -has-value"><span class="packages-score-value-number">4.21M</span><span 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class="title">More</h3><p><a href="/packages?q=dependency%3Acode_builder" rel="nofollow">Packages that depend on code_builder</a></p></aside></div><script type="application/ld+json">{"@context":"http\u003a\u002f\u002fschema.org","@type":"SoftwareSourceCode","name":"code\u005fbuilder","version":"4.10.1","description":"code\u005fbuilder - A fluent, builder-based library for generating valid Dart code.","url":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002fcode\u005fbuilder","dateCreated":"2016-09-19T16\u003a57\u003a46.278Z","dateModified":"2024-10-29T15\u003a12\u003a38.031826Z","programmingLanguage":"Dart","image":"https\u003a\u002f\u002fpub.dev\u002fstatic\u002fimg\u002fpub-dev-icon-cover-image.png","license":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002fcode\u005fbuilder\u002flicense"}</script></div><div class="detail-metadata"><h3 class="detail-metadata-title"><span class="detail-metadata-toggle">←</span> Metadata</h3><div class="detail-info-box"><a class="packages-scores" href="/packages/code_builder/score"><div class="packages-score packages-score-like"><div class="packages-score-value -has-value"><span class="packages-score-value-number">242</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">likes</div></div><div class="packages-score packages-score-health"><div class="packages-score-value -has-value"><span class="packages-score-value-number">160</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">points</div></div><div class="packages-score packages-score-downloads" title="Number of downloads of this package during the past 30 days"><div class="packages-score-value -has-value"><span class="packages-score-value-number">4.21M</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">downloads</div></div></a><h3 class="title">Publisher</h3><p><a href="/publishers/tools.dart.dev"><img class="-pub-publisher-shield filter-invert-on-dark" 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