react-native-flip-book/lib/module/hooks/useWhyDidYouUpdate.js

Page Flipper

"use strict";

/* eslint-disable */
// @ts-nocheck

import { useEffect, useRef } from 'react';
function useWhyDidYouUpdate(name, props) {
  // Get a mutable ref object where we can store props ...
  // ... for comparison next time this hook runs.
  const previousProps = useRef();
  useEffect(() => {
    if (previousProps.current) {
      // Get all keys from previous and current props
      const allKeys = Object.keys({
        ...previousProps.current,
        ...props
      });
      // Use this object to keep track of changed props
      const changesObj = {};
      // Iterate through keys
      allKeys.forEach(key => {
        // If previous is different from current
        if (previousProps.current[key] !== props[key]) {
          // Add to changesObj
          changesObj[key] = {
            from: previousProps.current[key],
            to: props[key]
          };
        }
      });
      // If changesObj not empty then output to console
      if (Object.keys(changesObj).length) {
        console.log('[why-did-you-update]', name, changesObj);
      }
    }
    // Finally update previousProps with current props for next hook call
    previousProps.current = props;
  });
}
export default useWhyDidYouUpdate;
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