SkillsAdd

thedaviddias/front-end-checklist

duplicate-js

Use when auditing slow page loads, heavy assets, or rendering delays related to Remove duplicate JavaScript libraries. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.

First seen Jun 8, 2026

Installation

$ npx skills add thedaviddias/front-end-checklist --skill duplicate-js
View on skills.sh ↗ GitHub repository ↗

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Also in this package

Other skills from thedaviddias/front-end-checklist · top by installs.

npx skills add thedaviddias/front-end-checklist
frontend-checklist-global 96 color-contrast 22 animation-performance 22 https 19 pdf-size 18 word-count 18 image-optimization 18 cumulative-layout-shift 18 mobile-testing 18 quality 17

Browse all from thedaviddias/front-end-checklist

More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 74.1K
License MIT
Default branch main
Open issues 5
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

More metadata
category
performance
priority
medium
difficulty
intermediate
estimatedTime
15
source
frontendchecklist.io
url
https://frontendchecklist.io/en/rules/performance/duplicate-js

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 1,698 B
  • docs SUMMARY.md 235 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 8 installs

SKILL.md

Remove duplicate JavaScript libraries

Duplicate libraries increase bundle size and memory usage, and can lead to unexpected behavior or conflicts between different versions of the same code.

Quick Reference

  • Detect and remove multiple versions of the same library
  • Use a single version across the entire application
  • Audit third-party scripts for bundled dependencies

Check

Identify duplicate JavaScript libraries or multiple versions of the same library being loaded using Lighthouse or bundle analysis tools.

Fix

Consolidate dependencies to use a single version and ensure third-party scripts don't bring in redundant libraries.

Explain

Explain the risks of loading duplicate JavaScript libraries and how it impacts performance and stability.

Code Review

Review the routes, assets, and loading behavior that affect Remove duplicate JavaScript libraries. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/performance/duplicate-js