CODEWITHSUNDEEP
javascriptreactjsreact-reduxreact-hooksuse-effect
Ignacio
Ignacio

Reputation: 83

How to fix React Redux and React Hook useEffect has a missing dependency: 'dispatch'

React Hook useEffect has a missing dependency: 'dispatch'. Either include it or remove the dependency array react-hooks/exhaustive-deps

I use useDispatch() Hook from React Redux on a functional component like this: 

const Component = () => {
  const dispatch = useDispatch();
  const userName = useSelect(state => state.user.name);

  useEffect(() => {
    dispatch(getUserInformation());
  }, [userId]);

  return (
    <div>Hello {userName}</div>
  );
};

export default Component;

How to remove this warning without removing the dependency array react-hooks/exhaustive-deps which can be useful to avoid other errors.

Upvotes: 6

Views: 3183

Answers (2)

Ritik Banger
Ritik Banger

Reputation: 2748

Simply add dispatch to your dependency array or make the dependency array empty.

First Case:

const Component = () => {
  const dispatch = useDispatch();
  const userName = useSelect(state => state.user.name);

  useEffect(() => {
    dispatch(getUserInformation());
  }, [userId, dispatch]);

  return (
    <div>Hello {userName}</div>
  );
};

export default Component;

Second Case:

const Component = () => {
  const dispatch = useDispatch();
  const userName = useSelect(state => state.user.name);

  useEffect(() => {
    dispatch(getUserInformation());
  }, []);

  return (
    <div>Hello {userName}</div>
  );
};

export default Component;

By adding these dependencies, your useEffect may cause re-rendering or not re-render at all. It all depends on your data and the context in which you use it.

Anyways, if you do not wish to follow both the above methods then //ts-ignore can work but I will not recommend this as this may create bugs in the long run.

Upvotes: 0

Muhammad Zeeshan
Muhammad Zeeshan

Reputation: 4748

To avoid that warning simply add dispatch to the dependency array. That will not invoke re-renders because dispatch value will not change.

const Component = () => {
  const dispatch = useDispatch();
  const userName = useSelect(state => state.user.name);

  useEffect(() => {
    dispatch(getUserInformation());
  }, [userId, dispatch]);

  return (
    <div>Hello {userName}</div>
  );
};

export default Component;

Upvotes: 8

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