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看到一段代码， setTimeout(resolve, 0), 不是很明白用意？

 3 years ago
source link: https://www.v2ex.com/t/799308
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V2EX  ›  React

看到一段代码， setTimeout(resolve, 0), 不是很明白用意？

  yazoox · 47 分钟前 · 323 次点击 
const whenStable = async () =>
  await act(async () => {
    await new Promise((resolve) => setTimeout(resolve, 0));
  });

原帖地址： https://stackoverflow.com/questions/60137762/how-can-i-test-a-react-hooks-component-by-changing-usestate?rq=1 只有一个回复，回复里面的测试文件，里面用到了这个

不是很理解这个的用意。如果说需要延时，那为什么 setTimeout 的参数是 0? 还是说，作者只是举个例子？应该设为比如 500，etc.?

以及，这个貌似有 warning

Warning: The callback passed to ReactTestUtils.act(...) function must not return anything.

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