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Duplicate JS

Testing & Quality
duplicate-js

Duplicate JS is an Agent Skill for testing & quality published in the thedaviddias/Front-End-Checklist repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

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.

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/thedaviddias/Front-End-Checklist/blob/HEAD/skills/duplicate-js/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/duplicate-js, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

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