react-app-shell/activity/src/router/async-component.js

react打包脚本和example, 这里的版本请忽略

import React, { Component } from 'react';

function asyncComponent(importComponent) {
  class AsyncComponent extends Component {
    state = {
      component: null
    };

    async componentDidMount() {
      const { default: component } = await importComponent();

      !this.isCancelled &&
        this.setState({
          component: component
        });
    }

    componentWillUnmount() {
      this.isCancelled = true;
    }

    render() {
      const C = this.state.component;

      return C ? <C {...this.props} /> : null;
    }
  }

  return AsyncComponent;
}

export default asyncComponent;