Skip to main content

Documentation Index

Fetch the complete documentation index at: https://docs.fallow.tools/llms.txt

Use this file to discover all available pages before exploring further.

Fallow is codebase intelligence for TypeScript and JavaScript. Use the free static layer to find unused code, duplication, complexity hotspots, architecture drift, and feature-flag branches across your module graph. Add the optional runtime layer when you want to know what actually executed in production.

Static intelligence (free)

MIT-licensed and open source. Understand how your code is wired.

Runtime intelligence (optional)

Paid team layer. Understand what actually ran in production.

​
Start here

1

Run Fallow without installing

npx fallow
No config needed for the first run.
2

Read the three analyses

Dead code, duplication, and complexity, in one pass.
3

Go deeper

npx fallow dead-code
npx fallow dupes
npx fallow health
npx fallow fix --dry-run

​
What Fallow helps you do

Delete cold code

Remove unused files, exports, and dependencies with confidence.

Reduce duplication

Find repeated logic before it spreads.

Prioritize refactors

Use complexity and health analysis to focus cleanup work.

Add runtime evidence

See hot paths, cold paths, and runtime-backed deletion evidence.

​
Pick your workflow

CLI

Best place to start. Works locally, in CI, and in agent loops.

VS Code

Real-time diagnostics, Code Lens, and one-click fixes in the editor.

MCP and agents

Structured tool calling for Claude Code, Cursor, and other agents.

​
Understand the two layers

Static analysis answers: what is connected to what? Runtime intelligence answers: what actually ran? They meet in fallow health.

Static vs runtime intelligence

Read the mental model before you set up runtime collection.

​
Most-used pages

Quick start

Configuration

CI integration

CLI reference