dittoryFind Repetitive Patterns

A static analysis CLI for TypeScript projects that detects parameters that always receive the same value.

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🔍

Smart Detection

Automatically finds props and arguments that are always passed the same value across your entire codebase.

⚡

Fast Analysis

Built on ts-morph for efficient TypeScript/TSX parsing. Requires a tsconfig.json in your project.

🛠️

Flexible Configuration

Configure via CLI options or config files. Supports both JavaScript and JSON configs.

🎯

Targeted Analysis

Analyze React components, functions, or both. Fine-tune with minimum usage thresholds.

Quick Start

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$ npx dittory ./src --min=3

$ pnpm dlx dittory ./src --min=3

$ yarn dlx dittory ./src --min=3

$ bunx dittory ./src --min=3

Example Output

Button src/components/Button.tsx:15
Constant Arguments:
  - variant = "primary"
Usages (5):
  - src/pages/Home.tsx:23
  - src/pages/About.tsx:45
  - src/pages/Contact.tsx:12
  - src/features/auth/Login.tsx:67
  - src/features/auth/Register.tsx:89


fetchUser src/api/users.ts:42
Constant Arguments:
  - includeProfile = true
  - cache = false
Usages (3):
  - src/hooks/useUser.ts:18
  - src/pages/Profile.tsx:31
  - src/components/UserCard.tsx:55


---
Found 2 function(s) with constant arguments out of 24 function(s).

Why dittory?

When a prop or argument is always passed the same value across your codebase, it's often a sign that:

The parameter could be removed and replaced with a default value
The API could be simplified by eliminating unnecessary options
There's copy-paste code that should be refactored