Biome
A formatter and linter for web projects, written in Rust. A fork of Rome Tools taken over by the community in 2023 when the company behind it shut down. Replaces Prettier and ESLint with a single tool.
The argument is speed and simplicity: formatting runs orders of magnitude faster than Prettier, there's one configuration file instead of three, and you avoid maintaining plugins whose job is to stop two tools fighting over the same lines. The formatting is deliberately near-identical to Prettier's — compatibility sits around 97 percent — so migration barely shows in the diff. It supports JavaScript, TypeScript, JSX, JSON, CSS and GraphQL. What's missing is ESLint's ecosystem: if you rely on rules from a dozen plugins they likely don't exist, and framework-specific rule sets lag behind. Oxlint is the other Rust-based challenger.