useIsomorphicLayoutEffect cannot pass test cases in non-web environment

[malash]

Do you want to request a feature or report a bug?

Report a bug.

What is the current behavior?

react-redux/src/hooks/useSelector.js

Lines 22 to 27 in 2eac861

	const useIsomorphicLayoutEffect =
	typeof window !== 'undefined' &&
	typeof window.document !== 'undefined' &&
	typeof window.document.createElement !== 'undefined'
	? useLayoutEffect
	: useEffect

react-redux/src/components/connectAdvanced.js

Lines 40 to 45 in 6725400

	const useIsomorphicLayoutEffect =
	typeof window !== 'undefined' &&
	typeof window.document !== 'undefined' &&
	typeof window.document.createElement !== 'undefined'
	? useLayoutEffect
	: useEffect

These two files implement the useIsomorphicLayoutEffect hook to prevent the React warning by using useEffect instead of useLayoutEffect. But it could break on non-web environment, like React Native, and etc.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to a CodeSandbox (https://codesandbox.io/s/new) or RN Snack (https://snack.expo.io/) example below:

I tested by these steps:

1. Clone the react-redux repo
2. Modify useIsomorphicLayoutEffect to const useIsomorphicLayoutEffect = useEffect
3. Run npx jest

What is the expected behavior?

1. We should add some test cases for non-web environment. For example @testing-library/react-native provides the way to test react-native in jest.
2. We should review the implement of useIsomorphicLayoutEffect and fix it if there did have some bugs.

Which versions of React, ReactDOM/React Native, Redux, and React Redux are you using? Which browser and OS are affected by this issue? Did this work in previous versions of React Redux?

react-redux@7.1.1

cc

@byunicorn

[markerikson]

No one has yet filed actual bugs reporting this doesn't work in React Native. Do you have any actual test cases that show it fails in an RN app?

[malash]

😂Bug happened here #1437

[malash]

B.T.W. I think it worth to add unit tests for RN because users did use react-redux in RN , right ?

[markerikson]

Yep, but I wasn't sure how to try to add RN unit tests at the time.

[malash]

How about @testing-library/react-native ?

[markerikson]

Fixed by #1444 .