Fallow

Fallow is a codebase health tool for JavaScript and TypeScript that finds unused code, circular dependencies, duplicates, and complexity hotspots with zero configuration. The static analysis is free and fast (sub-second), with 95 framework plugins built in. What makes it interesting is the runtime coverage layer: you can merge production execution data into the same report to see what's actually hot, what's safe to delete, and which feature flags are stale. A single local capture is free, continuous monitoring is paid. The CLI outputs clean JSON for automation, auto-fixes unused exports, and runs in CI with regression baselines. Use it when you need to clean up a codebase before a refactor or want data-driven confidence about what code is actually dead in production.

skills.sh installs: 10.1K
GitHub stars: 137
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add fallow-rs/fallow-skills --skill fallow --agent claude-code

Installs into .claude/skills of the current project.

Files

Fallow: codebase intelligence for TypeScript and JavaScript

Fallow analyzes code and styles for changed-code risk, cleanup opportunities, circular dependencies, duplication, complexity hotspots, architecture boundary violations, design-system styling drift, feature flags, and opt-in security candidates. Runtime coverage merges production execution data into the same fallow health report for hot-path review and cold-path deletion confidence. A single local capture is available by default. Continuous or cloud runtime monitoring is optional.

SKILL.md on GitHub

Sponsors

Promote your product hereReach 125k+ visitors monthly Promote your product hereReach 125k+ visitors monthly