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react/packages
Sophie AlpertandGitHub 293fed8993 Warn for bad useEffect return value (#14069)
Mostly to catch this:

```js
useEffect(async () => {
  // ...
  return cleanup;
});
```

Is this too restrictive? Not sure if you would want to do like

```js
useEffect(() => ref.current.style.color = 'red');
```

which would give a false positive here. We can always relax it to only warn on Promises if people complain.
2018-11-02 14:43:45 -07:00
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