memory-leak-detector

To prevent memory leaks in React useEffect hooks, return a cleanup function that removes event listeners, clears timers, or cancels active subscriptions when the component unmounts. This ensures resources are released properly.

Memory leaks in JavaScript applications are typically caused by unremoved event listeners, uncleared intervals and timeouts, uncancelled fetch requests, and active subscriptions that continue running after components unmount or are no longer needed.

Cancel fetch requests to avoid memory leaks by utilizing an AbortController. Pass the controller's signal to the fetch call, then invoke abort() within the useEffect cleanup function to terminate in-flight network requests when the component unmounts.

Clean up event listeners in JavaScript by calling removeEventListener within a useEffect cleanup function. Store the listener handler in a variable and ensure it matches the exact event type and callback used during the addEventListener registration.

Yes, this memory leak detection approach works with TypeScript. The cleanup patterns for timers, subscriptions, and event listeners within component lifecycles apply directly to TypeScript and JavaScript asynchronous operations.

AbortController is limited to canceling fetch requests and specific asynchronous operations. It does not automatically clean up event listeners, intervals, or subscriptions, which still require manual removal within the useEffect cleanup function.