React: Original error message is swallowed in an edge case with render phase updates

[gaearon]

"Cannot set property 'memoizedState' of null"

  // Regression test
  fit('does not swallow original error when updating another component in render phase', () => {
    let {useState} = React;

    let _setState;
    function A() {
      const [, setState] = useState(0);
      _setState = setState;
      return null;
    }

    function B() {
      _setState(() => {
        throw new Error('Hello')
      });
    }

    expect(() =>
      ReactTestRenderer.create(
        <React.Fragment>
          <A />
          <B />
        </React.Fragment>,
      ),
    ).toThrow('Hello');
  });

[vldmrkl]

I'd like to work on this issue if you don't mind.

[gaearon]

I won't promise we won't fix it sooner — but if you can find the cause, it would be appreciated

[gaearon]

I found a fix but thanks for the offer.

[joshuaaguilar20]

@gaearon just curious did you find the cause?

[gaearon]

Yes I fixed it