Wanting to solve these problems, Ryan Dahl returned in 2020 with Deno, which solved all the problems and flaws of NodeJs. However, there are common issues in both NodeJs and Deno, which still remain unresolved. To address both issues and due to frustration with the speed of NodeJs when developing a NextJs project, Jarred Summer introduced Bun in 2022.
Bun wants to be the evolution of the transport system which alleviates the city congestion of the metropolis which has now become Node.js, making things more fluid and simple.
What is Bun
Its main advantages are three:
- Speed. Bun starts fast and runs fast.
V8 and JSC use very different architectures and optimization strategies: JSC prioritizes faster startup times and reduced memory usage with a slightly slower execution time, while V8 prioritizes fast execution with greater runtime optimization which can lead to increased memory usage. Thanks to this, Bun was 2 times faster than Deno and 4 times faster than Node. As computing moves to the edge, this is a critical point.
- Elegant APIs. Bun provides a minimal set of highly optimized APIs for performing common tasks, such as starting an HTTP server and writing files.
Bun makes this simpler and more immediate by offering integrated support for standard Web APIs. Developers do not have to resort to additional third-party packages, which, in comparison, are also less fast and reliable than those offered by Bun.
Another important feature of Bun is that it gives the possibility to use ES and CommonJs modules together within the same file, which is impossible in Node.js.
Bundler and test runner
Testing is a crucial step in software development, as it ensures that the code behaves as expected, while identifying potential problems before they emerge in production. While Node.js developers rely on third parties for their testing needs, Bun integrates a test runner that ensures speed, compatibility, and a range of features suited to modern development workflows.
Bun is quickly conquering the audience. It is optimized for MacOS and Linux, with everything it offers, Bun is definitely a toolkit worth trying.