Evan Wallace's blazingly fast JS bundler in Go. Underpins Vite, tsx, and many tooling chains; reset the speed bar for JS tooling.
From Wikipedia
esbuild is a free and open-source module bundler and minifier for JavaScript and CSS written by Evan Wallace. Written in Go instead of JavaScript, esbuild claims to be "10 to 100 times" faster than other bundlers by using parallelism and shared memory usage. It supports TypeScript, JSX, tree-shaking and is extensible through plugins.