cdn-usage
About
This Claude Skill provides CDN selection guidance when adding external browser dependencies. It recommends jsDelivr as the default choice with npm syntax for automatic semver resolution, and includes reliability tips like avoiding integrity hashes that LLMs often get wrong. Use this skill whenever you need to load scripts via CDN to ensure robust dependency loading.
Quick Install
Claude Code
Recommended/plugin add https://github.com/dave1010/toolsgit clone https://github.com/dave1010/tools.git ~/.claude/skills/cdn-usageCopy and paste this command in Claude Code to install this skill
Documentation
CDNs (if needed)
- UMD is probably best, unkess you're composing multiple modern packages and know they expose export syntax.
- Skip integrity hashes (LLMs get them wrong)
- LLM training data may get URLs wrong. Add
onerror="alert('Failed to load: ' + this.src)"
jsDelivr
- Use npm syntax: https://cdn.jsdelivr.net/npm/package@1 (auto-resolves latest 1.x)
- Works for ESM and UMD; safe default when unsure.
Example:
<script type="module">
import duckdbduckdbWasm from 'https://cdn.jsdelivr.net/npm/@duckdb/duckdb-wasm@1.30.0/+esm'
</script>
cdnjs
- Only for very well-known libraries
- Eg https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js
- Explicit versions (@1.0.0) since it lacks semver resolution.
esm.sh
- Use for live ESM transforms, not static files. Transforms TS/TSX on the fly.
- Eg
import * as THREE from "https://esm.sh/three@0.180.0"; - tsx mode: load https://esm.sh/tsx as a module → inline <script type="text/tsx">
GitHub Repository
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