biomejs

This skill guides developers working on Biome's codebase through essential patterns and pitfalls. It covers AST and syntax node navigation, efficient string extraction without…

This skill walks you through building changesets for Biome pull requests that introduce user-facing changes—bug fixes, new features, rule updates, or formatter tweaks. It covers…

Build effective error messages, warnings, and hints for Biome lint rules using the Diagnostic trait and advice system. Learn to craft messages that explain what went wrong, why it…

This skill establishes documentation standards for Biome developers writing comments and rustdoc in the codebase. It distinguishes three comment types—module docs for explanation,…

This skill guides you through building option migrators for the `biome migrate eslint` command, preserving ESLint rule configurations beyond severity alone. Learn to model ESLint…

Learn to implement and modify Biome's formatters using its trait-based IR system. This skill covers generating formatter boilerplate, writing FormatNodeRule implementations,…

This skill guides you through building new lint rules and assist actions for Biome. It covers rule scaffolding across multiple languages, implementation patterns with semantic…

This skill teaches you how to add parsing support for new languages to Biome by authoring grammars in ungrammar format, implementing lexers and token sources, and writing parse…

This skill walks you through the pull request workflow for the Biome project, covering branch selection based on change type, conventional commit title formatting, and the…

testing-codegen guides you through snapshot testing with insta and code generation for the Biome codebase. It covers running tests for specific crates, fast iteration with…

This skill teaches you how to work with Biome's type inference engine and module graph architecture for building type-aware lint rules. It covers the three-phase type resolution…