esbuild achieves 10-100x faster builds than Webpack and Parcel by being written in Go with heavy parallelization. A full application bundle that takes 60 seconds in Webpack completes in under a second.
Handles JavaScript, TypeScript, JSX, and CSS without additional loaders or configuration. Tree shaking, code splitting, source maps, and minification are built in. Used as the production bundler inside Vite.
Plugin API enables custom transformations and resolution. Single Go binary with zero JavaScript dependencies makes installation instant and reproducible.
Ideal as a fast build tool for libraries, CLI tools, and server-side code. For full-featured application bundling with HMR and dev server, Vite (which uses esbuild internally) is typically preferred.