ESLint vs Biome: Which Linter for CI?
Biome is a fast, all-in-one Rust toolchain; ESLint is the extensible standard with a vast rule and plugin ecosystem.
ESLint is the established JavaScript/TypeScript linter with thousands of community rules and plugins. Biome is a Rust-based toolchain that lints and formats in one fast binary.
| ESLint | Biome | |
|---|---|---|
| Speed | Slower (JS, plugin overhead) | Very fast (Rust) |
| Rule / plugin ecosystem | Huge | Smaller, growing |
| Formatting | Separate (Prettier) | Built in |
| Config | Flexible, can sprawl | Minimal, opinionated |
| Setup | More moving parts | Single binary |
In CI
Biome runs much faster and bundles linting and formatting in one tool, which simplifies and speeds up the pipeline. ESLint wins on coverage: if you depend on specific plugins (framework rules, accessibility, import ordering, custom rules), ESLint still has them and Biome may not. Some teams run Biome for speed and keep ESLint only for rules Biome lacks.
Migration effort
Biome covers many common ESLint rules but not all. Audit your enabled plugins and rules before switching; expect to keep a small ESLint config for anything Biome cannot yet enforce.
The verdict
Want fast lint+format with minimal config and your rules are covered: Biome. Depend on a wide ESLint plugin ecosystem: stay on ESLint (or run both). Check rule coverage before migrating.