Biome vs ESLint: Which Linter for CI?
Biome is a Rust-based linter-and-formatter that runs far faster than ESLint, which keeps the broadest plugin ecosystem and full configurability.
ESLint is the standard JavaScript/TypeScript linter with a massive rule and plugin ecosystem. Biome is a Rust-based toolchain that lints and formats in one fast pass, with a growing built-in rule set and minimal configuration.
| Biome | ESLint | |
|---|---|---|
| Implementation | Rust | JavaScript |
| Speed | Very fast | Slower |
| Scope | Lint + format | Lint (Prettier for format) |
| Rule/plugin ecosystem | Growing, built in | Largest |
| Config | Minimal | Flexible, can be complex |
In CI
Biome lints (and formats) dramatically faster than ESLint and needs little configuration, which shortens the lint step on large repos. ESLint's advantage is its enormous ecosystem: framework-specific, accessibility, and custom rules that Biome may not cover yet. If you depend on niche ESLint plugins, Biome may not replace them fully; if you mostly want fast, standard linting and formatting, Biome is compelling.
Migration effort
Audit your custom ESLint rules and plugins before switching; many teams adopt Biome incrementally or keep ESLint for specific plugins. Linting runs on CI runners; faster managed runners shorten whichever linter you use on big codebases.
The verdict
Want a fast, low-config lint-and-format tool and your rules are covered: Biome. Depend on a wide or custom ESLint plugin set: stay on ESLint (or run both). Check plugin coverage before migrating.