Bun 1.0 is finally out! Know about what it is in under 2 minutes.

Bun js 1.0.0 is released and people are going crazy! Below are some of the tweets that praise and criticize the runtime.

Before enjoying the recent tweets, let’s first understand what is Bun js.

Looks like it is many things. Let’s unfold them one at a time.

1. Bun is a javascript runtime

(Taking from the website directly)

Bun is a new JavaScript runtime built from scratch to serve the modern JavaScript ecosystem. It has three major design goals:

• Speed. Bun starts fast and runs fast. It extends JavaScriptCore, the performance-minded JS engine built for Safari. As computing moves to the edge, this is critical.

• Elegant APIs. Bun provides a minimal set of highly optimized APIs for performing common tasks, like starting an HTTP server and writing files.

• Cohesive DX. Bun is a complete toolkit for building JavaScript apps, including a package manager, test runner, and bundler.

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.

2. Bun is an npm-compatible package manager.

Well, they claim to be the fastest package manager.

It still uses node_modules. Meaning, installing via yarn / npm is still going to build dependencies into the node_modules folder.

3. Bun is a test runner that makes the rest look like test walkers.

It supports a lot of widely used frameworks/practices out of the box. This makes it easier to get up and running with unit tests without needing to set up much of the dependencies.

Again, they claim to be faster than most of the test runners out there.

Other notable things include:

1. Baked in Typescript/JSX support.

2. ESM & CommonJS compatibility.

3. Node.js compatibility.

4. Web APIs.

5. Hot Reloading.

6. Bun APIs, Plugins, …

You can read more about the launch announcement here - https://bun.sh/blog/bun-v1.0.

If you have already tried out Bun, please share your thoughts in the comments or reply to this email directly.

I’m yet to try it out. I will come out with a new article on how I felt about Bun after trying with a small project.

Hope this summary helped you understand the Bun and its offerings.

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