Speed. Elegant APIs. Bun provides a minimal set of highly-optimimized APIs for performing common tasks, like starting an HTTP server and writing files.
Bun is designed as a drop-in replacement for Node.js. It natively implements hundreds of Node.js and Web APIs, including fs, path, Buffer and more.
Benefits of Bun
- Bun takes only 0.36 seconds to compile your code, whereas it takes about 6.44 seconds in the case of pnpm, 10.58 seconds with npm, and 12.08 seconds with yarn.
The difference in speed is magnified when running a TypeScript file as Node.js requires a transpilation step before it can be run.
Bun Supports Hot Reloading
Bun takes hot reloading a step further. By running Bun with the –hot flag, hot reloading is enabled:
bun –hot index.ts
Unlike the Node.js methods that might require a full process restart, Bun reloads your code in-place without terminating the old process. This ensures that HTTP and WebSocket connections remain uninterrupted and the application state is preserved, providing a smoother development experience.
- Parcel, .parcelrc
Bun has both ESM and CommonJS Compatibility
Another great feature about Bun is that we can use ES Modules and CommonJs together in the same file, which was not possible in Node.js.
You can use import and require() in the same file:
When transitioning to a new runtime or environment, compatibility is often a primary concern for developers. Bun addresses this by positioning itself as a drop-in replacement for Node.js. This means that existing Node.js applications and npm packages can seamlessly integrate with Bun without any modifications.
Why is Bun so fast?
If you want to get things done faster, you should consider replacing Node.js with Bun.
Now you are all set. To install a npm package, do this:
To start a Next.js app, do this:
bun run dev
All you need to do is replace npm with bun.
For more information you can check out their official web site and documentation https://bun.sh/