esbuild

esbuild is an extremely fast JavaScript and CSS bundler and minifier written in Go. Current stable version is 0.14.47, released monthly. It outperforms Webpack, Rollup, and Parcel by 10-100x by leveraging parallelism and Go's speed. Key differentiators include built-in TypeScript and JSX support, CSS bundling, and a plugin API. It supports ESM and CJS outputs, and ships TypeScript type definitions. esbuild is designed as a build tool core, not a full-featured replacement for Webpack/Rollup; it lacks HMR and code splitting for dynamic imports (under development).