superset-frontend/src/hooks/useMemoCompare.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { useEffect, useRef } from 'react';
import { isDefined } from '@superset-ui/core';

export const useMemoCompare = <T>(
  next: T,
  compare: (prev: T | undefined, next: T) => boolean,
) => {
  const previousRef = useRef<T>();
  const previous = previousRef.current;
  const isEqual = compare(previous, next);
  useEffect(() => {
    if (!isEqual) {
      previousRef.current = next;
    }
  });
  if (!isDefined(previous)) {
    return next;
  }
  return isEqual ? previous : next;
};