AsyncComponent.js

import React from 'react'

const { func, bool } = React.PropTypes

export default class AsyncComponent extends React.Component {

    static propTypes = {
        resolve: func.isRequired,
        showProcess: bool
    }

    static defaultProps = {
        showProcess: true
    }

    state = { component: null }

    componentWillMount() {
        this.props.resolve((err, content) => {
            this.setState({ component: content.default })
        })
    }

    render() {
        const { component: Component } = this.state
        const { showProcess, ...restProps } = this.props

        return Component ? <Component {...restProps} /> : (showProcess && <div>Loading...</div>)
    }
}