ReddRadar
Agent skill
jscpd
Finds duplicate code blocks and analyzes duplication metrics across files. Use when identifying copy-pasted code, measuring technical debt, or preparing for refactoring.
Install this agent skill to your Project
npx add-skill https://github.com/knoopx/pi/tree/main/agent/skills/jscpd
SKILL.md
jscpd
Copy-paste detector for JavaScript, TypeScript, and many other languages.
Quick Start
# Scan a directory, ignoring build artifacts
bunx jscpd --ignore "**/node_modules/**,**/dist/**" src/
# Scan with threshold — exit code 1 if duplication exceeds 5%
bunx jscpd --threshold 5 --ignore "**/node_modules/**,**/dist/**" src/
Common Options
| Option | Description |
|---|---|
--min-tokens N |
Minimum tokens for duplicate detection (default: 50) |
--min-lines N |
Minimum lines for duplicate detection (default: 5) |
--threshold N |
Fail if duplication % exceeds threshold |
--ignore "glob" |
Ignore patterns (comma-separated) |
--reporters type |
Output format: console, json, html |
--output path |
Output directory for reports |
--silent |
Suppress console output |
Workflow
- Scan: Run jscpd to detect duplicates
bash
bunx jscpd --reporters console --ignore "**/node_modules/**,**/dist/**" src/ - Review: Examine each reported duplicate pair — decide whether to extract a shared function, merge files, or accept the duplication
- Refactor: Extract shared logic into a helper, utility, or base class. Common patterns:
- Identical functions in multiple files → extract to shared module
- Similar functions with small differences → parameterize or use generics
- Repeated config blocks → extract to a shared config file
- Verify: Re-run with a threshold to confirm duplication is within target
bashIf the command exits with code 0, duplication is below the threshold.
bunx jscpd --threshold 5 --ignore "**/node_modules/**,**/dist/**" src/
Example: JSON Report for CI
bunx jscpd --reporters json --output ./reports src/
# Produces reports/jscpd-report.json with structured duplicate data
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