/bun:build

Bundle JavaScript/TypeScript or compile to standalone executable.

When to Use This Skill

Scenario	Use this skill	Alternative
Quick production bundle of an entry point	Yes	N/A
Compiling to a standalone executable	Yes	N/A
Building for a specific target (browser/bun/node)	Yes	N/A
Configuring complex build pipelines	No - use bun-development	Full build configuration guidance
Running project build scripts (bun run build)	No - use bun-development	N/A

Parameters

• entry (required): Entry point file
• --compile: Create standalone executable
• --minify: Minify output

Execution

Production bundle:

bun build $ENTRY --outdir=dist --minify --sourcemap=external

Standalone executable:

bun build --compile --minify $ENTRY --outfile={{ OUTFILE | default: "app" }}

Development bundle:

bun build $ENTRY --outdir=dist --sourcemap=inline

Build Targets

# Browser (default)
bun build $ENTRY --target=browser --outdir=dist

# Bun runtime
bun build $ENTRY --target=bun --outdir=dist

# Node.js
bun build $ENTRY --target=node --outdir=dist

Agentic Optimizations

Context	Command
Prod bundle	bun build ./src/index.ts --outdir=dist --minify --sourcemap=external
Compile to exe	bun build --compile --minify ./app.ts --outfile myapp
Dev bundle	bun build ./src/index.ts --outdir=dist --sourcemap=inline
Browser target	bun build ./src/index.ts --target=browser --outdir=dist
Node target	bun build ./src/index.ts --target=node --outdir=dist

Post-build

1. Report output file sizes
2. List generated files in output directory
3. For --compile: verify executable runs with ./app --help or similar