esbuild is a modern JavaScript and TypeScript bundler, minifier, and transpiler built using the Go programming language. It helps developers bundle files, reduce code size, and speed up web app builds. Its biggest advantage is performance, making it one of the fastest build tools available today.
The biggest reason developers choose esbuild is speed. Because it is written in Go and uses parallel processing, it can build projects 10–100 times faster than traditional tools like Webpack or Rollup. Large applications often compile in under a second.
esbuild works with JavaScript, TypeScript, JSX, CSS, JSON, and other file types without requiring multiple tools. Developers can build React, Vue, and other modern frontend projects with minimal configuration and fewer dependencies.
It includes many important features by default. esbuild supports tree shaking to remove unused code, code minification for smaller bundles, source maps for debugging, and both ES Modules and CommonJS, making project setup simple and efficient.
TypeScript and JSX are supported out of the box, but esbuild focuses on speed instead of type validation. It removes TypeScript types during the build process, so developers should still run the TypeScript compiler (tsc) separately for complete type checking.
esbuild also improves the development experience with watch mode for automatic rebuilds and a built-in local server for testing projects. It offers both a command-line interface and APIs, making it suitable for automation, scripts, and CI/CD workflows.
Many popular tools, including Vite, Remix, Astro, and SvelteKit, use esbuild to deliver faster builds. While its plugin ecosystem is smaller than Webpack's, it is an excellent choice for developers who want simple configuration, lightning-fast performance, and modern web development workflows.