Biome v2 vs ESLint + tsc: Should You Replace Your Toolchain?

A practical comparison of Biome v2 against the traditional ESLint + TypeScript compiler + Prettier stack. Biome v2 offers 5–10x faster lint runs, unified configuration, and type-aware diagnostics without a separate tsc process, but it doesn't fully replace tsc for builds and declaration output. The recommended 2026 setup for many teams is Biome for linting/formatting/fast diagnostics alongside tsc for builds. Migration should be incremental and benchmark-driven, with ESLint replacement only justified when CI is slow, tooling complexity is high, and custom plugin dependencies are minimal.