original.js

import { Component } from "react";

const Enhance = Target => class extends Component {
  state = {
    data: null
  }
  
  constructor() {
    super()
  }
  
  componentDidMount() {
    this.setState({ data: 'Hello' })
  }
  
  render() {
    return <Target {...this.props} data={this.state.data} />
  }
}

@Enhance
export class Button extends Component {

  static propTypes = {
    width: number
  }

  static defaultProps = {
    width: 100
  }


  // Initial State
  state = {
    counter: Math.round(this.props.width / 10)
  }

  _handleClick = (event) => {
    event.preventDefault();
    this.setState({ counter: this.state.counter + 1 });
  }

  render() {
    return (
      <div>
        This button has been clicked: {this.state.counter} times
        Some cool data: {this.props.data}
        <button 
          onClick={this._handleClick.bind(this)} 
          style={{ width: this.props.width }} />
      </div>
    )
  }
}

transpiled.js

"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(object, property, receiver) { var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { return get(parent, property, receiver); } } else if ("value" in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } };

var _inherits = function (subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) subClass.__proto__ = superClass; };

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _Component3 = require("react");

var Enhance = function Enhance(Target) {
  return (function (_Component) {
    var _class = function () {
      _classCallCheck(this, _class);

      _get(Object.getPrototypeOf(_class.prototype), "constructor", this).call(this);
      this.state = {
        data: null
      };
    };

    _inherits(_class, _Component);

    _createClass(_class, [{
      key: "componentDidMount",
      value: function componentDidMount() {
        this.setState({ data: "Hello" });
      }
    }, {
      key: "render",
      value: function render() {
        return React.createElement(Target, _extends({}, this.props, { data: this.state.data }));
      }
    }]);

    return _class;
  })(_Component3.Component);
};

var Button = (function (_Component2) {
  function Button() {
    var _this = this;

    _classCallCheck(this, Button);

    if (_Component2 != null) {
      _Component2.apply(this, arguments);
    }

    this.state = {
      counter: Math.round(this.props.width / 10)
    };

    this._handleClick = function (event) {
      event.preventDefault();
      _this.setState({ counter: _this.state.counter + 1 });
    };
  }

  _inherits(Button, _Component2);

  _createClass(Button, [{
    key: "render",
    value: function render() {
      return React.createElement(
        "div",
        null,
        "This button has been clicked: ",
        this.state.counter,
        " times Some cool data: ",
        this.props.data,
        React.createElement("button", {
          onClick: this._handleClick.bind(this),
          style: { width: this.props.width } })
      );
    }
  }], [{
    key: "propTypes",
    enumerable: true,
    value: {
      width: number
    }
  }, {
    key: "defaultProps",
    enumerable: true,
    value: {
      width: 100
    }
  }]);

  exports.Button = Button = Enhance(Button) || Button;
  return Button;
})(_Component3.Component);

exports.Button = Button;

// Initial State