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Bun v1.0

Bun v1.0

On September 8, 2023, Bun version 1 was released as the first production-ready version of Bun, a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript.

Why a new JS runtime

You may ask, we already have Node and Deno, so why would we need another javascript runtime, Well yes we had Node for a very long time, but developers face a lot of problems with it, and maybe the first problem is because it’s there for a very long time, it has been changing a lot between different versions and one of the biggest nightmares for JavaScript developers these days is upgrading the node version. Also, Node lacks support for Typescriptt.

Zig programming language

One of the main reasons that Bun is faster than Node, is the programming language it has been built with which is Zig. Zig is a very fast programming language, even faster than C (here is some benchmarks), it focuses on performance and memory control. The reasons it’s faster than C is because of the LLVM optimizations it has, and also the way it handles the undefined behavior under the hood

Developer Experience

Bun delivers a better developer experience than Node on many levels. First, it’s almost fully compatible with Node so you can use Node packages without any issues. Also, you don’t need to worry about JS Common and ES Modules anymore, you can use both in the same file, yup you read that right, for example:

import { useState } from 'react';
const React = require('react');

Also, it has a built-in test framework similar to Jest or Vitest in the project so no need to install a different test framework with different bundler in the same project like Webpack or Vite

import { describe, expect, test, beforeAll } from "bun:test";

Also, it supports JSX out-of-the-box

bun index.tsx

Also, Bun has the fastest javascript package manager and the most efficient you can find as of the time of this post

bun install

Bun Native APIs

Bun supports the Node APIs but also they have fun and easy APIs to work with like

  • Bun.serve() : to create HTTP server
  • Bun.file() : to read and write the file system
  • Bun. password.hash(): to hash passwords
  • Bun.build(): to bundle files for the browser
  • Bun.FileSystemRouter(): a file system router

And many more features

Plugin system

Bun also has an amazing plugin system that allows developers to create their own plugins and add them to the Bun ecosystem.

import { plugin, type BunPlugin } from "bun";

const myPlugin: BunPlugin = {
  name: "Custom loader",
  setup(build) {
    // implementation
  },
};

Conclusion

Bun is a very promising project, and it’s still in the early stages, but it has a lot of potential to be the next big thing in the JavaScript world. It’s fast, easy to use, and has a lot of amazing features. I’m very excited to see what the future holds for Bun and I’m sure it will be a very successful project.

This Dot Labs is a development consultancy that is trusted by top industry companies, including Stripe, Xero, Wikimedia, Docusign, and Twilio. This Dot takes a hands-on approach by providing tailored development strategies to help you approach your most pressing challenges with clarity and confidence. Whether it's bridging the gap between business and technology or modernizing legacy systems, you’ll find a breadth of experience and knowledge you need. Check out how This Dot Labs can empower your tech journey.

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Testing a Fastify app with the NodeJS test runner cover image

Testing a Fastify app with the NodeJS test runner

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Node’s assert API has been around for a long time, this is what we are using to make our test assertions. To run this test, we can use the following command: By default the Node.js test runner uses the TAP reporter. You can configure it using other reporters or even create your own custom reporters for it to use. Testing our SQL plugin Next, let's take a look at how to test our Fastify Postgres plugin. This one is a bit more involved and gives us an opportunity to use more of the test runner features. In this example, we are using a feature called Subtests. This simply means when nested tests inside of a top-level test. In our top-level test call, we get a test parameter t` that we call methods on in our nested test structure. In this example, we use `t.beforeEach` to create a new Fastify app instance for each test, and call the `test` method to register our nested tests. Along with `beforeEach` the other methods you might expect are also available: `afterEach`, `before`, `after`. 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They are for what you would expect based on the names, skipping or only running certain tests, and work-in-progress tests. If you prefer, you also have the option of using the describe` → `it` test syntax. They both come with the same methods as `test` and I think it really comes down to a matter of personal preference. Test coverage This might be the deal breaker for some since this feature is still experimental. As popular as test coverage reporting is, I expect this API to be finalized and become stable in an upcoming version. Since this isn’t something that’s being shipped for the end user though, I say go for it. What’s the worst that could happen really? Other CLI flags —watch` - https://nodejs.org/dist/latest-v20.x/docs/api/cli.html#--watch —test-name-pattern` - https://nodejs.org/dist/latest-v20.x/docs/api/cli.html#--test-name-pattern TypeScript support You can use a loader like you would for a regular node application to execute TypeScript files. 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How to host a full-stack app with AWS CloudFront and Elastic Beanstalk cover image

How to host a full-stack app with AWS CloudFront and Elastic Beanstalk

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Next.js 13 Server Actions cover image

Next.js 13 Server Actions

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Nuxt DevTools v1.0: Redefining the Developer Experience Beyond Conventional Tools cover image

Nuxt DevTools v1.0: Redefining the Developer Experience Beyond Conventional Tools

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