What is esbuild?

esbuild is an ultra-fast bundler and transpiler for JavaScript and TypeScript, written in Go. It is used for building, transforming, and minifying frontend code, and is known primarily for its high performance: tens of times faster than JavaScript-based tools (for example, Babel or Webpack loaders).

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#What esbuild can do

• transpile JS/TS into code supported by browsers
• bundle a project into bundles
• minify and optimize JS and CSS
• act as a replacement for Babel + Terser in a single tool
• support ESM, CommonJS, tree shaking, and source maps

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#Why it is so fast

• written in Go, it runs as compiled binary code, not through an interpreter
• effectively uses multithreading
• does not repeat work when it is not needed (optimizations inside the pipeline)

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#Where it is used

• as a standalone bundler (CLI or API)
• inside other tools: Vite, Turbopack, Snowpack, Nx, and others

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#Summary

esbuild is a fast, low-level tool for building and transforming JS/TS code that delivers speed and optimizations unattainable for JavaScript-based bundlers.