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View guide →Codebase intelligence for TypeScript/JavaScript — health, duplication, dead code and architecture.
fallow is an open-source dev tools project by fallow-rs (fallow-rs/fallow on GitHub). It has 5,022 GitHub stars and 171 forks, is released under the MIT license, and was last updated on GitHub on 8 October 2026.
Pick your pain: dead code, growing complexity, duplication, or architecture drift in a TS/JS repo.
Run npx fallow in your repository for a combined health, duplication and unused-code report.
Add it as a dev dependency, install git hooks, or add the GitHub Action in report-only mode first.
Audit only what your change introduces, preview auto-fixes with fallow fix --dry-run, and prove exports unused before deleting them.
Health scores, complexity hotspots, duplication, circular dependencies, architecture boundaries, design-system drift and unused code from a single codebase graph.
fallow audit reports only the findings your change introduces — ideal as a pull-request gate that never blames you for legacy issues.
fallow fix removes fixable issues (dry-run first), and dead-code --trace proves an export is unused before you delete it.
Ships as a CLI, GitHub Action, GitLab CI support, an LSP, an MCP server and a VS Code extension.
The analyzer contains no AI: the same input always gives the same output with stable fingerprints, and rule severities (error/warn/off) are configurable.
fallow agent install wires detected agents (Claude Code, Codex, Cursor) with an AGENTS.md task map, skills, the MCP server and commit/push gates.
Clone Fallow if you want the source; most users run it via npx.
git clone https://github.com/fallow-rs/fallow.git
cd fallowRun the full health, duplication and unused-code pass in any TypeScript/JavaScript repo.
npx fallowAudit just your recent changes, then preview the available auto-fixes.
npx fallow audit --base HEAD~15
npx fallow fix --dry-runFallow is maintained by fallow-rs, with documentation at docs.fallow.tools.
Yes — it is open source under the MIT license (the README describes it as Rust, MIT licensed).
No. Fallow is a local static analyzer with no AI inside; it runs entirely on your machine or CI.
ESLint lints style and local rules and knip focuses on unused files/exports; Fallow builds one graph across the codebase to combine health, duplication, architecture, drift and dead-code analysis with change-scoped audits.
Run npx fallow in your repo, read the report, then adopt the GitHub Action in report-only mode.
Repowise — codebase intelligence: health scores, auto-docs, git analytics and dead-code detection via MCP.
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