docusaurus/packages/docusaurus-theme-bootstrap/src/theme/ThemedImage/index.tsx

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import React from 'react';
import clsx from 'clsx';

import useIsBrowser from '@docusaurus/useIsBrowser';
import useThemeContext from '@theme/hooks/useThemeContext';
import type {Props} from '@theme/ThemedImage';

import styles from './styles.module.css';

const ThemedImage = (props: Props): JSX.Element => {
  const isBrowser = useIsBrowser();
  const {isDarkTheme} = useThemeContext();
  const {sources, className, alt = '', ...propsRest} = props;

  type SourceName = keyof Props['sources'];

  const clientThemes: SourceName[] = isDarkTheme ? ['dark'] : ['light'];

  const renderedSourceNames: SourceName[] = isBrowser
    ? clientThemes
    : // We need to render both images on the server to avoid flash
      // See https://github.com/facebook/docusaurus/pull/3730
      ['light', 'dark'];

  return (
    <>
      {renderedSourceNames.map((sourceName) => {
        return (
          <img
            key={sourceName}
            src={sources[sourceName]}
            alt={alt}
            className={clsx(
              styles.themedImage,
              styles[`themedImage--${sourceName}`],
              className,
            )}
            {...propsRest}
          />
        );
      })}
    </>
  );
};

export default ThemedImage;