source-command-tech-dupes

name	source-command-tech-dupes
description	Code duplication analysis for StarMapper using jscpd. Detects repeated patterns across geocoding helpers, GitHub API formatting, compression utils, and cache logic.

source-command-tech-dupes

Use this skill when the user asks to run the migrated source command tech-dupes.

Command Template

Code Duplication Detector — StarMapper

Usage

/tech:dupes

What It Does

1. Runs pnpm dupes (jscpd) on the src/ directory
2. Analyzes results against StarMapper-specific patterns
3. Outputs structured report with action plan

Setup Check

If pnpm dupes is not configured, add to package.json:

"dupes": "jscpd src/ --threshold 3 --min-lines 5 --reporters console,json --output .dupes-report"

And install: pnpm add -D jscpd

StarMapper Duplication Patterns to Watch

Pattern	Location	Risk
location.toLowerCase().trim()	geocoder, routes	Should exist ONLY in geocoder.ts
GitHub error parsing	github.ts, chunk/route.ts	Extract to github.ts
Compression/decompression logic	page.tsx, cache routes	Extract to lib/compression.ts
checkDbHealth() call pattern	user-cache, cache routes	OK if identical — it's a guard
NextResponse.json({ error: ... }) patterns	all routes	Accept duplication here
cursor ? { cursor } : {}	github.ts	Should only be in github.ts

Thresholds

Metric	Target	Action
Duplication %	< 3%	Above → refactor
Clone count	< 10	Above → prioritize
Max clone size	< 25 lines	Above → extract function

Output Format

## Duplication Report — StarMapper

**Date**: {date}
**Duplication**: X% ({target: < 3%})
**Clones found**: N

### Top Clones
1. [file:line] ↔ [file:line] — {N} lines
   Pattern: {brief description}
   Action: {extract to / delete duplicate}

### Action Plan
#### Quick Wins (< 30min)
1. ...

#### Refactoring (1-2h)
2. ...

#### Prevention
- Add `pnpm dupes` to CI check