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dart-use-ffigen

Generates Dart FFI bindings from C headers using package:ffigen.

1|Updated Aug 14, 2026
Search Tags:#code generation#tree shaking#dart#ffi#ffigen#native bindings#c headers
One-click install
npx skills add https://github.com/sohampawar1866/zeromile-go --skill dart-use-ffigen-sohampawar1866
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: dart-use-ffigen
Source: https://github.com/sohampawar1866/zeromile-go/tree/main/.agents/skills/dart-use-ffigen
Command: npx skills add https://github.com/sohampawar1866/zeromile-go --skill dart-use-ffigen-sohampawar1866

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires ffigen.

What problem does it solve? Hand-written Dart FFI bindings are error-prone, brittle, and block native asset tree shaking. This Skill automates binding generation with package:ffigen so C, Objective-C, and Swift integrations stay correct and maintainable. ## Core Features & Use Cases - Automated Binding Generation: Builds a programmatic FfiGenerator script at tool/ffigen.dart that parses native headers and emits Dart bindings. - Tree Shaking Support: Configures recordUse and recordUseMapping outputs so unused native symbols can be stripped at link time. - Conventions & Verification: Enforces output under lib/src/third_party/ with .g.dart extensions, license preambles, targeted inclusion filters, and dart analyze validation. - Use Case: When adding a binding for sqlite3_libversion from third_party/sqlite/sqlite3.h, generate lib/src/third_party/sqlite3.g.dart automatically instead of writing manual DynamicLibrary lookups. ## Quick Start Generate FFI bindings for the native headers in this package using package:ffigen and verify the result with dart analyze.

Frequently Asked Questions about dart-use-ffigen

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate Dart FFI bindings from C headers?▼

Create a generator script at tool/ffigen.dart that configures FfiGenerator with your header entry points, function inclusion filters, and output paths, then run dart run tool/ffigen.dart. Add ffigen as a dev dependency first with dart pub add dev:ffigen.

Should I write dart:ffi bindings manually or use ffigen?▼

Use ffigen whenever native headers exist or are generated by a build step. Manual DynamicLibrary.lookup and @Native declarations are error-prone, brittle across ABI changes, and lack the recordUse metadata needed for symbol tree shaking.

Does ffigen support tree shaking of native symbols?▼

Yes. Set recordUse to (_) => true under Functions and specify a recordUseMapping output file ending in .g.dart under lib/src/third_party/. This registers bindings so link-time tree shaking can strip unused native symbols.

Where should generated ffigen binding files be placed?▼

Generated bindings that interface with third-party libraries must go under lib/src/third_party/ and use the .g.dart extension, such as sqlite3.g.dart. The generator script itself belongs at tool/ffigen.dart in the package root.

Why does dart analyze report warnings in generated ffigen files?▼

Generated code often triggers lints like camel_case_types or non_constant_identifier_names. Fix this by adding the warning codes to the ignore_for_file list in the generator's preamble configuration rather than editing the generated file or global lint rules.

What should I do when ffigen output has compile errors?▼

Do not edit the generated file manually. Report the analyzer error details to the user and direct them to file an issue on the dart-lang/native repository, since errors in generated bindings indicate a generator or header parsing problem.

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