Agent RulesAgent Rules
BI

Biome

Fast formatter and linter

JavaScript
Linter / Formatter
Used by 214 projects
formatting
linting
performance
Use in BuilderAll JavaScript Options

Details

Language / Topic
javascriptJavaScript
Category
Linter / Formatter

Rules

balanced
- Run `biome check --write .` for combined linting and formatting — Biome replaces both ESLint and Prettier with a single fast tool.
- Configure `biome.json` with `linter.rules` and `formatter` sections — Biome supports JavaScript, TypeScript, JSON, and CSS.
- Run `biome ci .` in CI pipelines (exits non-zero on errors) — use `biome check --write` locally for auto-fixes.
- Enable recommended rules: `"linter": { "rules": { "recommended": true } }`.
- Use `biome ci` in CI pipelines — it exits non-zero on any violation without auto-fixing.
- Use `biome.json` overrides for file-specific rule configuration (e.g., relaxed rules for test files).
- Migrate from ESLint + Prettier with `biome migrate eslint` and `biome migrate prettier`.