cache-component.js

function PromiseComponent(initializeComponent, loadingComponent) {
  let cachedComponent;
  return class PromiseComponent extends React.Component {
	  state = { Component: cachedComponent || loadingComponent || () => null };
	  componentDidMount() {
		  if (!cachedComponent) {
			initializeComponent.then(component => {
				cachedComponent = component.default;
				this.setState({ Component: cachedComponent });
		 	});		  
		  }
	  }
	  render() {
		  const { Component } = this.state;
		  return <Component {...this.props} />
	  }
  }
}