feat: Add code duplication detection with jscpd#1289
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Adding CLAUDE.md with task information for AI processing. This file will be removed when the task is complete. Issue: #1286
Add jscpd (JavaScript Copy Paste Detector) to detect code duplications in the codebase: - Add .jscpd.json configuration file with sensible defaults: - 11% threshold (current baseline) - JavaScript format focus - Excludes experiments, data, and case study directories - Generates HTML reports in ./reports/jscpd - Add jscpd as devDependency (^4.0.5) - Add npm script: npm run check:duplication - Integrate into CI/CD workflow (lint job in release.yml) - Add reports/ to .gitignore for generated HTML reports This addresses #1286 request for code duplication detection from js-ai-driven-development-pipeline-template best practices. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
konard
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This reverts commit 37251e8.
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Summary
Implements code duplication detection using jscpd (JavaScript Copy Paste Detector) as requested in #1286 (specifically item 3: Code Duplication Detection).
Per @konard's comment, only the code duplication detection feature is needed for now, not the multi-runtime testing support.
Changes
1. Add
.jscpd.jsonconfiguration file./reports/jscpd/2. Add jscpd dependency
jscpd@^4.0.5as devDependency3. Add npm script
npm run check:duplication- runs jscpd on the codebase4. CI/CD Integration
lintjob ofrelease.yml5. Add reports/ to .gitignore
Current Status
The codebase currently has 10.65% code duplication (4,445 duplicated lines out of 41,754 total). The threshold is set to 11% to allow the check to pass while preventing significant new duplications.
Reference
Based on best practices from js-ai-driven-development-pipeline-template.
Test Plan
npm run check:duplicationpasses (10.65% < 11% threshold)npm run lintpassesnpm run format:checkpassesnpm testpasses (all tests)Fixes
Fixes #1286 (Code Duplication Detection item only)
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