dev-npm-package

Develop npm packages with Node.js and TypeScript following modern best practices. Use when: (1) Creating a new npm package from scratch, (2) Setting up package.json exports for dual ESM/CJS, (3) Configuring TypeScript for library authoring, (4) Building and publishing npm packages, (5) Creating CLI tools with bin field, (6) Setting up testing with vitest, (7) Configuring CI/CD for npm publishing, (8) Troubleshooting ESM/CJS interop issues, (9) User mentions 'npm package', 'publish to npm', 'library development', or 'create npm module'.