Bundlib

Bundlib is an automatic library bundler built on top of Rollup.js, designed to streamline the process of packaging JavaScript and TypeScript libraries. The current stable version is 0.21.9, with active development indicated by frequent patch releases (0.21.9, 0.21.8, 0.21.7, etc.) that introduce new features like parallel builds and improved CLI commands, alongside bug fixes. It aims to simplify Rollup configuration for common library bundling scenarios, offering both automatic configuration derived from `package.json` and advanced programmatic or file-based configuration via `defineConfig`. A key differentiator is its focus on opinionated defaults to reduce setup complexity, while still allowing fine-grained control for various build types (ESM, CJS, UMD, types). Users should note that while powerful, the project is explicitly stated to be "under development," suggesting potential for evolving APIs or unresolved edge cases. It ships with TypeScript types and requires Node.js >=18.