Biome vs Prettier: Which Formatter for CI?
Prettier is the de facto code formatter; Biome formats in Rust much faster and also lints, with high Prettier compatibility.
Prettier is the widely adopted opinionated formatter for JavaScript and many other languages. Biome is a Rust-based toolchain that formats (with strong Prettier compatibility) and lints in one fast pass.
| Biome | Prettier | |
|---|---|---|
| Implementation | Rust | JavaScript |
| Speed | Very fast | Slower |
| Scope | Format + lint | Format only |
| Prettier compatibility | High | n/a |
| Language coverage | Growing | Very broad (plugins) |
In CI
Biome formats much faster than Prettier and bundles linting, so one fast tool can replace two steps - a clear win for CI format-check time. Prettier has the broadest language and plugin coverage and the deepest ecosystem adoption. Biome's formatting is highly Prettier-compatible, so output differences are usually small; check the edge cases for your languages before switching.
Format check in CI
Run a format check (not a write) in CI so misformatted code fails the build, and keep editor and CI on the same tool/version. Format checks run on CI runners; faster managed runners shorten the pass on large codebases.
The verdict
Want fast formatting plus linting in one Rust tool: Biome (verify compatibility for your languages). Want the de facto formatter with the broadest language and plugin coverage: Prettier. Run a format check as a CI gate either way.