小编Whj*_*Whj的帖子

“ @ types / react”：“ ^ 16.7.17”
“ @ types / react-dom”：“ ^ 16.0.11”
“ typescript ”：“ ^ 3.2.2”

function ArryElement() {
  return [
    <div key='1'>1</div>,
    <div key='2'>2</div>
  ];
}

function App() {
  return <ArryElement />
}

• 反应:16.3.0-alpha.1
• 开玩笑:"22.3.0"
• 酶:3.3.0
• 打字稿:2.7.1

码:

class Foo extends React.PureComponent<undefined,undefined>{
   bar:number;
   async componentDidMount() {
     this.bar = 0;
     let echarts = await import('echarts'); // async import
     this.bar = 100;
   }
}

测试:

describe('...', () => {
  test('...', async () => {
    const wrapper = shallow(<Foo/>);
    const instance = await wrapper.instance();
    expect(instance.bar).toBe(100);
  });
});

错误:

Expected value to be:
  100
Received:
  0