npm Library Setup with ESM

This skill provides comprehensive guidance on setting up an npm library with package.json, with a preference for ES Modules (ESM).

Overview

This skill helps you create npm packages that:

• Use ES Modules (ESM) with "type": "module"
• Configure modern exports field (no deprecated module field)
• Use bunchee for zero-config bundling
• Use vitest for modern testing
• Support TypeScript and React component libraries

When to Use This Skill