@babel/standalone provides a standalone build of Babel for use in browsers and other non-Node.js environments.If you're using Babel in production, you should normally not use @babel/standalone. Instead, you should use a build system running on Node.js, such as Webpack, Rollup, or Parcel, to transpile your JS ahead of time.

However, there are some valid use cases for @babel/standalone: * It provides an easy, convenient way to prototype with Babel. Using @babel/standalone, you can get started using Babel with just a simple script tag in your HTML. * Sites that compile user-provided JavaScript in real-time, like JSFiddle, JS Bin, the REPL on the Babel site, JSitor, etc. * Apps that embed a JavaScript engine such as V8 directly, and want to use Babel for compilation * Apps that want to use JavaScript as a scripting language for extending the app itself, including all the goodies that ES2015 provides. * Other non-Node.js environments (ReactJS.NET, ruby-babel-transpiler, php-babel-transpiler, etc).