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es-modules

Use when reviewing scripts, client components, bundles, or runtime behavior related to Use ES modules (import/export). Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.

skills/es-modules/SKILL.md

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# Use ES modules (import/export)

ES modules are statically analyzable — bundlers can determine at build time what code is actually used and eliminate the rest (tree-shaking). CommonJS require() is dynamic and prevents this optimization. ES modules are also the browser-native standard, reducing the need for build-time transformation.

## Quick Reference

- Use import/export syntax instead of require()/module.exports
- Named exports improve IDE autocompletion and enable tree-shaking
- Add type="module" to script tags or use a bundler to load ES modules in browsers
- Default exports are fine but named exports scale better in large codebases

## Check

Identify any use of require(), module.exports, or exports in this JavaScript file that should be converted to ES module syntax.