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React 20 ref Cleanup Functions: The Return Value That Finally Fixes Your Event Listener Leaks

React 20 ref Cleanup Functions: The Return Value That Finally Fixes Your Event Listener Leaks

September 19, 2026

React 20's ref cleanup return value eliminates the useEffect boilerplate that caused most DOM event listener memory leaks. Learn when ref cleanup replaces useEffect and when it does not.

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