bun-runtime
Bun Runtime
Bun is a fast all-in-one JavaScript runtime and toolkit: runtime, package manager, bundler, and test runner.
When to Use
- Prefer Bun for: new JS/TS projects, scripts where install/run speed matters, Vercel deployments with Bun runtime, and when you want a single toolchain (run + install + test + build).
- Prefer Node for: maximum ecosystem compatibility, legacy tooling that assumes Node, or when a dependency has known Bun issues.
Use when: adopting Bun, migrating from Node, writing or debugging Bun scripts/tests, or configuring Bun on Vercel or other platforms.
How It Works
- Runtime: Drop-in Node-compatible runtime (built on JavaScriptCore, implemented in Zig).
- Package manager:
bun installis significantly faster than npm/yarn. Lockfile isbun.lock(text) by default in current Bun; older versions usedbun.lockb(binary). - Bundler: Built-in bundler and transpiler for apps and libraries.
- Test runner: Built-in
bun testwith Jest-like API.
Migration from Node: Replace node script.js with bun run script.js or bun script.js. Run bun install in place of npm install; most packages work. Use bun run for npm scripts; bun x for npx-style one-off runs. Node built-ins are supported; prefer Bun APIs where they exist for better performance.
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