Microbundle

Microbundle is a zero-configuration bundler for small JavaScript libraries, currently at version 0.15.1. Powered by Rollup, it simplifies the build process by automatically generating optimized bundles in multiple formats: CommonJS (CJS), ECMAScript Modules (ESM), Universal Module Definition (UMD), and a 'modern' ESM bundle for contemporary browsers. It supports ESnext features, async/await, multiple entry points, TypeScript out-of-the-box, built-in Terser compression, and gzipped bundle size tracking. While not adhering to a strict release cadence, it receives frequent updates, often in the form of patch releases, indicating active maintenance. Key differentiators include its minimal setup (often just `package.json` configuration) and focus on producing tiny, performant outputs with modern browser targets by default.