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duplication-radar

v0.1.5

Published

Detect structural code duplication that individual Git diffs miss.

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

mitaliagrmitaliagr

Keywords

duplicationclone-detectioncode-qualityasttree-sittercli

Readme

duplication-radar

Detect structural code duplication that individual Git diffs miss — the same logic under different names, files, or languages.

Usage

From inside the repo:

npx duplication-radar compare . <base> <head>

Examples:

npx duplication-radar compare . main feature-branch
npx duplication-radar compare . main origin/feat/multi-gpu-select
  • . — current repo (or a git URL for compare)
  • <base> — branch to compare against (e.g. main)
  • <head> — branch under review (e.g. feature-branch or origin/feat/...)

Compare uncommitted work against a ref:

npx duplication-radar check . --base main

Requires Node.js >= 20 and git on your PATH.

Output

compare and check print a matches table by default: one row per PR unit (path::name), with each match on its own line in the second column. Long paths wrap at / or ::.

Meaningful duplication: YES

| PR code                              | Matched with                         |
|--------------------------------------|--------------------------------------|
| frontend/src/renderer/components/    | frontend/src/renderer/components/    |
| settings/ReportProblemDialog.tsx::   | settings/SettingsRow.tsx::InputRow   |
| DiscordIcon                          | frontend/src/landing/.../Blog.tsx::  |
|                                      | Block                                |

Exit 0 if clean, 1 if meaningful duplication grew.

Flags

| Flag | Description | |------|-------------| | --json | Machine-readable CheckResult JSON | | --full | Legacy cluster report (sections, deltas, cluster labels) | | --verbose | With --full: include unchanged clusters |

What it scans

Source files for supported languages. Test code is skipped: test directories (tests/, __tests__/, src/test/, etc.) and conventional test filenames (*_test.go, *.test.ts, *.spec.ts, *Test.java, …).

Other commands

npx duplication-radar similar <repo>   # list duplication clusters in a single snapshot
npx duplication-radar parse <repo>   # debug: parsed units per file

License

MIT