reactjs - React TypeScript 16.8 如何使 useEffect() 异步

Question

为什么不能useEffect()使用异步等待？

const Home: React.FC = () => {
    
    useEffect(async () => {
        console.log(await ecc.randomKey())
    }, [])
    
    return (
    ...

我得到的错误是

Argument of type '() => Promise' is not assignable to parameter of type 'EffectCallback'.

Type 'Promise' is not assignable to type 'void | (() => void | undefined)'.

Type 'Promise' is not assignable to type '() => void | undefined'.

Type 'Promise' provides no match for the signature '(): void | undefined'.ts(2345)

Answer 1

不建议将效果声明为异步函数。
但是您可以在效果中调用异步函数，如下所示:

useEffect(() => {
  const genRandomKey = async () => {
    console.log(await ecc.randomKey())
  };

  genRandomKey();
}, []);

更多信息: React Hooks Fetch Data