# fallow-rs/fallow

Codebase intelligence for TypeScript and JavaScript. Free static analysis of code and styles: unused code, duplication, circular deps, complexity hotspots, architecture boundaries, design-system drift. Optional paid runtime layer (Fallow Runtime): hot-path review and cold-path deletion evidence from real production traffic.

Repository: https://github.com/fallow-rs/fallow
Canonical: https://ross.abutalabs.com/products/fallow
Homepage: https://docs.fallow.tools
Language: Rust
License: MIT
License Family: permissive
Topics: cli, code-quality, dead-code, developer-tools, javascript, linter, oxc, rust, static-analysis, typescript, unused-code, unused-dependencies, unused-exports, code-duplication, duplicate-code, copy-paste-detection, codebase-intelligence, runtime-intelligence
Last push: 2026-08-26T17:19:33+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 12
- inputs: {"age_days": 169, "days_push": 7, "days_rel": 8, "gap_med": 0, "n_releases_24m": 226}
- flags: young
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4413, forks 153 (observed 2026-08-28T04:08:48.538801+00:00)

## What it is
Fallow is a Rust-based CLI that performs static analysis of TypeScript and JavaScript codebases, detecting unused code, duplication, circular dependencies, complexity hotspots, architecture boundary violations, and design-system styling drift. It ships as a single binary with integrations for VS Code, Neovim, CI pipelines, MCP-based AI agents, and Node.js bindings, plus an optional paid runtime layer that adds production execution evidence.

## Use cases
- find unused files and exports in a typescript repo
- detect circular dependencies in a javascript monorepo
- find duplicate code across files
- identify complexity hotspots to prioritize refactoring
- find unused npm dependencies in package.json
- enforce architecture boundaries in ci
- detect design-system styling drift
- give ai coding agents deterministic codebase analysis via mcp

## When to choose
- you maintain a large TypeScript/JavaScript codebase or monorepo and need fast, deterministic dead-code and duplication analysis
- you want a single binary with no Node.js or TypeScript compiler dependency for static analysis
- you want to gate merges in CI on new code-quality findings only
- you use AI coding agents and want exhaustive module-graph analysis they cannot do themselves

## When to avoid
- your codebase is not TypeScript or JavaScript
- you need runtime production-traffic evidence without paying for the optional Fallow Runtime layer
- you need a long-running analysis service rather than a one-shot CLI
- you need deep semantic type-checking beyond what static graph analysis provides

## Facets
- artifact type: cli-tool
- maturity: active
- function: static-site-generator, linter, developer-tools, cli, mcp
- domain: developer-tools, web-development, frontend
- platform: cli, windows, rust, editor-plugin
- tags: dead-code, unused-exports, unused-dependencies, code-duplication, circular-dependencies, complexity-analysis, typescript, javascript, static-analysis, code-quality, architecture-boundaries, design-system-drift, monorepo, ci-gate, vscode-extension, oxc, codebase-intelligence, runtime-intelligence, command-line, macos, linux, nodejs, docker

## Member repositories
- fallow-rs/fallow (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:48.538801+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:21:02.433769+00:00, confidence not recorded.
  - readme: https://github.com/fallow-rs/fallow (fetched 2026-08-28T04:08:48.538801+00:00, sha e9a2c89e996e)
  - homepage: https://docs.fallow.tools (fetched 2026-08-29T09:08:55.657506+00:00, sha 7e37b4d6fa1a)
  - site_page: https://docs.fallow.tools/installation (fetched 2026-08-29T09:08:55.666486+00:00, sha e9860e6a443f)
  - site_page: https://docs.fallow.tools/quickstart (fetched 2026-08-29T09:08:55.668468+00:00, sha b1755cbbf649)
  - site_page: https://docs.fallow.tools/integrations (fetched 2026-08-29T09:08:55.670143+00:00, sha 6efaae3d4522)
  - site_page: https://docs.fallow.tools/integrations/mcp (fetched 2026-08-29T09:08:55.671870+00:00, sha 9d71d98af176)
  - site_page: https://docs.fallow.tools/integrations/node-bindings (fetched 2026-08-29T09:08:55.674815+00:00, sha b7c445a6d9d7)
  - site_page: https://docs.fallow.tools/integrations/agent-skills (fetched 2026-08-29T09:08:55.676892+00:00, sha 79eb963edc2b)
  - site_page: https://docs.fallow.tools/integrations/claude-hooks (fetched 2026-08-29T09:08:55.679120+00:00, sha 60bd6aaf4602)
  - site_page: https://docs.fallow.tools/integrations/vscode (fetched 2026-08-29T09:08:55.681328+00:00, sha 510d3887efd1)
- Data as of 2026-08-30T08:39:29.467469+00:00.