Bun Runtime

Bun is an all-in-one JavaScript/TypeScript runtime, package manager, bundler, and test runner.

Runtime

Bun runs .ts, .tsx, .js, and .jsx files directly. No compilation step or tsconfig required.

bun run index.ts              # Run a file
bun --watch run server.ts     # Restart on file changes
bun --hot run server.ts       # Hot reload (preserves state)

Package Management

Uses a binary lockfile (bun.lockb). Commit it to version control.