find-value-duplicates

Find duplicate TypeScript interfaces, types, and enums with identical content but different names.

Installation

npm install -g find-value-duplicates

Or use without installation:

npx find-value-duplicates

Usage

# Scan default directories (src, lib, types)
find-value-duplicates

# Scan specific directories
find-value-duplicates ./src ./components

# Output as JSON
find-value-duplicates --output=json

# Show help
find-value-duplicates --help

Features

• Finds duplicate interfaces, types, and enums
• Console and JSON output formats
• Configurable via config.json
• Provides refactoring suggestions
• Ignores test files and declaration files

Configuration

Create a config.json file:

{
  "scanPaths": ["./src", "./lib", "./types"],
  "excludePaths": ["node_modules", "dist"],
  "fileExtensions": [".ts", ".tsx"],
  "excludeExtensions": [".d.ts", ".test.ts"],
  "minTypeLength": 5,
  "outputFormat": "console"
}

Example Output

 TypeScript Value Duplicates Report
============================================================

 Statistics:
   Files scanned: 45
   Types found: 128
   Duplicate groups: 3

 Found 3 duplicate groups:

 Duplicate #1:
   Shared content: id:string;name:string;email:string

   Found in:
   1. interface UserProps (src/components/User.tsx:12)
   2. interface UserData (src/types/user.ts:8)
   3. type UserInfo (src/api/users.ts:15)

    Suggested fix:
   Create base interface and extend it

npm Scripts

Add to your package.json:

{
  "scripts": {
    "find-duplicates": "find-value-duplicates",
    "find-duplicates:json": "find-value-duplicates --output=json"
  }
}

License

MIT

Links

• npm Package
• GitHub Repository