fastlint

fastlint is a command-line tool (v1.1.0) that speeds up linting by running linters only on files changed in git — either in the working copy, staged, or compared to branches like master. It avoids running on unchanged files, integrating with eslint and other tools via piped filenames. Key features: --staged filter, --diff-filter (A/C/D/M/R/etc.), --glob filtering, and multiple path output modes. Stable, low maintenance, single-purpose tool. Alternatives include lint-staged and husky, but fastlint is more flexible for branch comparison.