bun-build

Bundle JavaScript/TypeScript file

$ bun build [./src/index.ts] --outdir [./dist]

$ bun build [./server.ts] --compile --outfile [server]

$ bun build [./src/index.ts] --outdir [./dist] --minify

$ bun build [./src/index.ts] --outdir [./dist] --sourcemap

$ bun build [./src/index.ts] --outdir [./dist] --target [node]

$ bun build [./src/index.ts] --outdir [./dist] --external [react]

$ bun build [./src/index.ts] [./src/worker.ts] --outdir [./dist]

bun build entrypoints [options]

bun build is Bun's fast native bundler for JavaScript and TypeScript. It bundles code for production, generates standalone executables, and supports both server and client code in a single command.
The bundler automatically performs tree-shaking to eliminate unused code. It can target multiple runtimes including browsers, Node.js, and Bun itself. The --compile flag creates self-contained executables with the Bun runtime embedded, enabling distribution without requiring users to install Bun. Code splitting, source maps, and minification are supported through command-line flags or the equivalent JavaScript API via Bun.build().

--outdir directory

Output directory for bundled files

Output file path (for single output)

Create standalone executable with embedded Bun runtime

Enable minification

Generate source maps (external, inline, or none)

Target runtime: browser, bun, or node

Exclude package from bundle

Enable code splitting

Output format: esm or cjs

Define global constants

Configure file type loaders

Standalone executables include a copy of the Bun runtime, increasing file size. Tree-shaking is always enabled. Some npm packages may not bundle correctly due to dynamic imports.

bun(1), bun-run(1), esbuild(1), webpack(1)