How to create react class components without ES6?

If you don’t use ES6 then you may need to use the create-react-class module instead. For default props, you need to define getDefaultProps() as a function on the passed object. Whereas for initial state, you have to provide a separate getInitialState method that returns the initial state.

var Greeting = createReactClass({
  getDefaultProps: function () {
    return {
      name: 'Jhohn',
    };
  },
  getInitialState: function () {
    return { message: this.props.message };
  },
  handleClick: function () {
    console.log(this.state.message);
  },
  render: function () {
    return <h1>Hello, {this.props.name}</h1>;
  },
});

Note: If you use createReactClass then auto binding is available for all methods. i.e, You don't need to use .bind(this) with in constructor for event handlers.