Create React App Babel Extend.

Add Babel presets and plugins to a create-react-app project without ejecting.

Excerpt from examples, what using decorators would look like:

import React from "react";
import { render } from "react-dom";
import { Provider, connect } from "react-redux";
import { createStore, combineReducers } from "redux";

@connect(state => ({ data: state.ExampleReducer.data }))
class ExampleComponent extends React.Component {
  render = () => <h1 children={this.props.data} />;
}

const ExampleReducer = (state = { data: "Hello world!" }) => state;
const reducers = combineReducers({ ExampleReducer });
const store = createStore(reducers);
const app = <Provider store={store} children={<ExampleComponent />} />;
const node = document.getElementById("root");

render(app, node);

Another excerpt from examples, using babel-plugin-preval:

/* global preval */
import React from "react";
import { render } from "react-dom";

const { version } = preval`
  const path = require("path");
  const fs = require("fs");
  const packageLocation = path.join(process.cwd(), "package.json");
  const { version } = JSON.parse(fs.readFileSync(packageLocation, "utf-8"));
  module.exports = {
    version
  };
`;

class ExampleComponent extends React.Component {
  render() {
    return <h1 children={`Example project version: ${version}`} />;
  }
}

render(<ExampleComponent />, document.getElementById("root"));

How to install and use.

1. $ npm install --save-dev cra-babel-extend.

2. Add cra-babel-extend && in front of the four default npm scripts found in a create-react-app project: start, build, test and eject. Like so:

   "scripts": {
     "start": "cra-babel-extend && react-scripts start",
     "build": "cra-babel-extend && react-scripts build",
     "test": "cra-babel-extend && react-scripts test --env=jsdom",
     "eject": "cra-babel-extend && react-scripts eject"
   },

3. Add a field called craBabelExtend to your package.json with two fields (optional) within it: plugins and presets. These behave exactly like those found in .babelrc. Here's how this would look:

   "craBabelExtend": {
     "presets": ["stage-0", "react-optimize"],
     "plugins": ["transform-decorators-legacy"]
   },

4. You should now be golden! npm install your babel plugins and presets while adding them to their respective field in the craBabelExtend field in your package.json. Check out the examples if something goes awry and open an issue if it persists.