loader: () => import("../containers/HomeAContainer")

import React, { Component } from 'react';

const asyncComponent = ( importComponent ) => {
    return class extends Component{
        state = { component: null }

        componentDidMount(){
            importComponent().then(cmp =>{
                this.setState({component: cmp.default});
            });
        }

        render (){
            const C = this.state.component;
            return C ? <C {...this.props} /> : null;
        }
    }
}

export default asyncComponent;

import Exemple from './example/example';

Import asyncComponent from './asyncComponent';
    const asyncExample = asyncComponent(()=>{
    return import('./example/example');
});