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Jun 25th, 2019
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  1. import { useEffect, useRef } from 'react';
  2.  
  3. function usePrevious<T>(value: T) {
  4. const ref = useRef<T>();
  5. useEffect(() => {
  6. ref.current = value;
  7. });
  8. return ref.current;
  9. }
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