docs/gremlint/src/components/FadeIn.tsx

/*
 * 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 React, { HTMLAttributes, useEffect, useState } from 'react';
import styled from 'styled-components';

const FadeInWrapper = styled.div<{ $opacity: number }>`
  opacity: ${({ $opacity }) => $opacity};
`;

const FadeIn = ({ children, ...props }: HTMLAttributes<HTMLDivElement>) => {
  const [opacity, setOpacity] = useState(0);

  useEffect(() => {
    setTimeout(() => setOpacity(1));
  }, []);

  return (
    <FadeInWrapper $opacity={opacity} {...props}>
      {children}
    </FadeInWrapper>
  );
};

export default FadeIn;