linter rust performance type-inference biome

Biome 2.1 scans only requested files, improves types

Light scanner now uses specified files as hints instead of scanning entire project root, reducing overhead; type inference improved from ~75% to ~85% detection on floating promises.

June 9, 2026

Summary

Faster linting on partial codebases and nested directories without sacrificing correctness. Type inference improvements reduce false negatives on async rule violations, cutting manual promise audits.

Why it matters

Faster linting on partial codebases and nested directories without sacrificing correctness. Type inference improvements reduce false negatives on async rule violations, cutting manual promise audits.

Implementation verdict

Drop-in upgrade for existing Biome 2.0 users. Project rules remain opt-in; no configuration changes needed unless you want the scanner speedup. Worth upgrading immediately if you run Biome on subdirectories or specific file patterns.

Sources

1.the scanner will know which parts of the project you are interested in, and only scan those
2.we've been able to improve this to ~85%
3.we already made the project rules opt-in for 2.0
4.npm install --save-dev --save-exact @biomejs/biome

Dev Signal

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