Biome

This is the Rust-based replacement for ESLint and Prettier that claims 100x speed improvements, and the configuration shows it's actually serious about being a drop-in replacement. You get linting and formatting in one tool with zero-config defaults, though the real win is for TypeScript projects where the native speed makes a difference in large codebases. The migration commands from Prettier and ESLint configs are included, and there's proper VS Code integration with format-on-save. Worth trying if you're tired of juggling two tools and waiting for ESLint to crawl through your monorepo, though you'll want to verify rule parity if you have a heavily customized ESLint setup.