Add bun topic

Author: n1ckoates

topics/bun/bun.png

@@ -0,0 +1,19 @@
+---
+display_name: Bun
+topic: bun
+github_url: https://github.com/oven-sh/bun
+aliases: bunjs
+logo: bun.png
+related: javascript, nodejs, typescript, webkit, npm, deno, zig
+url: https://bun.sh
+wikipedia_url: https://en.wikipedia.org/wiki/Bun_(software)
+created_by: Oven
+released: September 2021
+short_description: All-in-one JavaScript runtime & toolkit
+---
+
+**Bun** is an all-in-one JavaScript toolkit, including a runtime, package manager, test runner, and bundler.
+
+-   [**Runtime**](https://bun.sh/docs/cli/run): Bun is a JavaScript runtime built on top of JavaScriptCore, the engine that powers WebKit. It's designed to be a drop-in replacement for Node.js, while being faster and improving developer experience. It also includes built-in support for TypeScript and JSX.
+-   [**Package manager**](https://bun.sh/docs/cli/install): Bun includes a package manager that's vastly quicker than npm and Yarn, and is compatible with existing Node.js projects.
+-   [**Test runner**](https://bun.sh/docs/cli/test): Bun includes a Jest-compatible test runner that uses the Bun runtime. It supports TypeScript and JSX, lifecycle hooks, and UI/DOM testing.