Tips on organizing eventListener cleanup utilizing event subscription within useEffect?

Question

Tips on organizing eventListener cleanup utilizing event subscription within useEffect?

I am currently using React.useEffect() to add an event listener and remove it on unmount:

React.useEffect(() => {
    const myFn = () => {
      // do something
    };

    AppState.addEventListener('change', myFn);

    return () => {
      AppState.removeEventListener('change', myFn);
    };
  }, []);

This approach works fine, but I have noticed that with the latest version of react-native, removeEventListener() is deprecated. The new recommended way is to use the 'remove()' method on the event subscription returned by 'addEventListener()'.

So, how can we implement this change? One possible solution could be to use a ref to store the event subscription. This would allow us to call the 'remove' method when needed.

typescript react-native

Answer 1

Answer №1

The information you need can be found in the documentation related to removeEventListener():

removeEventListener()
removeEventListener(eventType, listener);
This method is no longer recommended. It is advised to use the remove() function on the EventSubscription object obtained from addEventListener().

To implement this new approach based on the example code provided, follow these steps:

useEffect(() => {
  const myFunction = () => {
    // perform an action
  };

  const eventSubscription = AppState.addEventListener('change', myFunction);

  return () => eventSubscription.remove();
}, []);

Answer 2

The information you need can be found in the documentation related to removeEventListener():

removeEventListener()
removeEventListener(eventType, listener);
This method is no longer recommended. It is advised to use the remove() function on the EventSubscription object obtained from addEventListener().

To implement this new approach based on the example code provided, follow these steps:

useEffect(() => {
  const myFunction = () => {
    // perform an action
  };

  const eventSubscription = AppState.addEventListener('change', myFunction);

  return () => eventSubscription.remove();
}, []);

Answer 3

Answer №2

According to the provided documentation, the recommended approach is to store the result of the addEventListener function, which includes its own remove method instead of directly using the myFn handler:

React.useEffect(() => {
    const myFn = () => {
      // do something
    };

    const event = AppState.addEventListener('change', myFn);

    return () => {
      event.remove();
    };
  }, []);

Answer 4

According to the provided documentation, the recommended approach is to store the result of the addEventListener function, which includes its own remove method instead of directly using the myFn handler:

React.useEffect(() => {
    const myFn = () => {
      // do something
    };

    const event = AppState.addEventListener('change', myFn);

    return () => {
      event.remove();
    };
  }, []);

Tips on organizing eventListener cleanup utilizing event subscription within useEffect?

Answer №1

`removeEventListener()`

Answer №2

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