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 skill) - Building an application (not a published package) -…