react.dev/docs/09-tooling-integration.md

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Every project uses a different system for building and deploying JavaScript. We've tried to make React as environment-agnostic as possible.

React

CDN-hosted React

We provide CDN-hosted versions of React on our download page. These pre-built files use the UMD module format. Dropping them in with a simple <script> tag will inject a React global into your environment. It should also work out-of-the-box in CommonJS and AMD environments.

Using master

We have instructions for building from master in our GitHub repository. We build a tree of CommonJS modules under build/modules which you can drop into any environment or packaging tool that supports CommonJS.

JSX

In-browser JSX Transform

If you like using JSX, Babel provides an in-browser ES6 and JSX transformer for development called browser.js that can be included from a babel-core npm release or from CDNJS. Include a <script type="text/babel"> tag to engage the JSX transformer.

Note:

The in-browser JSX transformer is fairly large and results in extraneous computation client-side that can be avoided. Do not use it in production — see the next section.

Productionizing: Precompiled JSX

If you have npm, you can run npm install -g babel. Babel has built-in support for React v0.12 and v0.13. Tags are automatically transformed to their equivalent React.createElement(...), displayName is automatically inferred and added to all React.createClass calls.

This tool will translate files that use JSX syntax to plain JavaScript files that can run directly in the browser. It will also watch directories for you and automatically transform files when they are changed; for example: babel --watch src/ --out-dir lib/.

By default JSX files with a .js extension are transformed. Run babel --help for more information on how to use Babel.

Example output:

$ cat test.jsx
var HelloMessage = React.createClass({
  render: function() {
    return <div>Hello {this.props.name}</div>;
  }
});

ReactDOM.render(<HelloMessage name="John" />, mountNode);
$ babel test.jsx
"use strict";

var HelloMessage = React.createClass({
  displayName: "HelloMessage",

  render: function render() {
    return React.createElement(
      "div",
      null,
      "Hello ",
      this.props.name
    );
  }
});

ReactDOM.render(React.createElement(HelloMessage, { name: "John" }), mountNode);

Helpful Open-Source Projects

The open-source community has built tools that integrate JSX with several editors and build systems. See JSX integrations for the full list.