Creating npm packages lets you share code across projects. Here's how to build professional packages.
Project Setup
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TypeScript Configuration
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Build Configuration
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Source Code Structure
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Testing
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Documentation
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Versioning with Changesets
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Publishing
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Package.json Best Practices
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Best Practices
Structure:
✓ Clear entry points
✓ Proper exports field
✓ TypeScript declarations
✓ Minimal dependencies
Quality:
✓ Comprehensive tests
✓ Good documentation
✓ Semantic versioning
✓ Changelog maintained
Publishing:
✓ Automate releases with CI
✓ Use changesets for versioning
✓ Test before publishing
✓ Tag releases properly
Conclusion
Building npm packages involves proper project setup, TypeScript configuration, testing, and automated publishing. Use modern build tools like tsup, maintain good documentation, and automate releases with changesets for a professional package development workflow.