Cancelling a Redux Thunk 3.0 Async Action

Provide an example of how to cancel an asynchronous action created by Redux Thunk 3.0 using AbortController to prevent setting state on an unmounted component.

// Action for fetching some data
const fetchData = () => {
  // This will hold the AbortController instance
  let abortController = new AbortController();
  return async (dispatch) => {
    try {
      // Signal to the fetch API that it supports aborting
      const response = await fetch('https://api.example.com/data', {
        signal: abortController.signal
      });
      // Only proceed if response is successful
      if (response.ok) {
        const data = await response.json();
        dispatch({ type: 'FETCH_SUCCESS', payload: data });
      } else {
        dispatch({ type: 'FETCH_FAILURE' });
      }
    } catch (error) {
      if (error.name === 'AbortError') {
        // Ignore because the fetch was cancelled
        console.log('Fetch aborted');
      } else {
        // Handle other errors
        dispatch({ type: 'FETCH_ERROR', error });
      }
    }
  };
};

This snippet creates an asynchronous Redux action using Thunk middleware. It uses AbortController to cancel the fetch request when needed.

// Usage in a React component
import React, { useEffect } from 'react';
import { useDispatch } from 'react-redux';
import { fetchData } from './pathToYourActions';

const MyComponent = () => {
  const dispatch = useDispatch();
  let abortController = new AbortController();

  useEffect(() => {
    dispatch(fetchData(abortController));

    // Clean up function that aborts the fetch when the component unmounts
    return () => abortController.abort();
  }, [dispatch]);

  // ... component logic
};

This snippet shows how to use the fetchData action within a React component. It handles the component's lifecycle with useEffect to ensure the fetch operation is aborted when the component unmounts.