Bun is an all-in-one toolkit for JavaScript and TypeScript apps. It ships as a single executable. At its core is the Bun runtime, a fast JavaScript runtime designed as a drop-in replacement for Node.js. It is a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, from a single file to a full-stack application.
Bun is considered to be 5x faster than NodeJS. It has inbuilt support for reading .env files, Node monitoring, Http fetch, Web sockets. Bun transpiler can run <code>.js</code>, <code>.ts</code>, <code>.cjs</code>, <code>.mjs</code>, <code>.jsx</code>, and <code>.tsx</code> files.&nbsp; It supports both CommonJS to ES modules.
Bun is built using Apple's <a href="https://webkit.org/" target="_blank" rel="noopener">WebKit</a> engine. WebKit is the engine that powers Safari and is used by billions of devices every day. It's fast, efficient, and has been battle-tested for decades.
Bun is orders of magnitude faster than npm, yarn, and pnpm. It uses a global module cache to avoid redundant downloads from the npm registry and uses the fastest system calls available on each operating system.
You can run Bun with --hot to enable hot reloading, which reloads your application when files change.
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Bun is incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one 

Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

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