npm Package Development (Bun-First)

Build and publish npm packages using Bun as the primary runtime and toolchain, producing output that works everywhere npm packages are consumed.

When to Use This Skill

Use when:

• Creating a new npm library package from scratch
• Setting up build/test/lint tooling for an existing package
• Fixing CJS/ESM interop, exports map, or TypeScript declaration issues
• Publishing a package to npm
• Reviewing or improving package configuration

Do NOT use when:

• Building an npx-executable CLI tool (use the npx-cli skill)
• Building an application (not a published package)
• Working in a monorepo (this skill targets single-package repos)

Toolchain