text: import * as React from 'react';
  import PropTypes from 'prop-types';
  import clsx from 'clsx';
  import withStyles from '../styles/withStyles';
  import Typography from '../Typography';
  
  export const styles = {
    /* Styles applied to the root element. */
    root: {
      display: 'flex',
      alignItems: 'center',
      padding: 16,
    },
    /* Styles applied to the avatar element. */
    avatar: {
      flex: '0 0 auto',
      marginRight: 16,
    },
    /* Styles applied to the action element. */
    action: {
      flex: '0 0 auto',
      alignSelf: 'flex-start',
      marginTop: -8,
      marginRight: -8,
    },
    /* Styles applied to the content wrapper element. */
    content: {
      flex: '1 1 auto',
    },
    /* Styles applied to the title Typography element. */
    title: {},
    /* Styles applied to the subheader Typography element. */
    subheader: {},
  };
  
  const CardHeader = React.forwardRef(function CardHeader(props, ref) {
    const {
      action,
      avatar,
      classes,
      className,
      component: Component = 'div',
      disableTypography = false,
      subheader: subheaderProp,
      subheaderTypographyProps,
      title: titleProp,
      titleTypographyProps,
      ...other
    } = props;
  
    let title = titleProp;
    if (title != null && title.type !== Typography && !disableTypography) {
      title = (
        <Typography
          variant={avatar ? 'body2' : 'h5'}
          className={classes.title}
          component="span"
          display="block"
          {...titleTypographyProps}
        >
          {title}
        </Typography>
      );
    }
  
    let subheader = subheaderProp;
    if (subheader != null && subheader.type !== Typography && !disableTypography) {
      subheader = (
        <Typography
          variant={avatar ? 'body2' : 'body1'}
          className={classes.subheader}
          color="textSecondary"
          component="span"
          display="block"
          {...subheaderTypographyProps}
        >
          {subheader}
        </Typography>
      );
    }
  
    return (
      <Component className={clsx(classes.root, className)} ref={ref} {...other}>
        {avatar && <div className={classes.avatar}>{avatar}</div>}
        <div className={classes.content}>
          {title}
          {subheader}
        </div>
        {action && <div className={classes.action}>{action}</div>}
      </Component>
    );
  });
  
  CardHeader.propTypes = {
    /**
     * The action to display in the card header.
     */
    action: PropTypes.node,
    /**
     * The Avatar for the Card Header.
     */
    avatar: PropTypes.node,
    /**
     * Override or extend the styles applied to the component.
     * See [CSS API](#css) below for more details.
     */
    classes: PropTypes.object.isRequired,
    /**
     * @ignore
     */
    className: PropTypes.string,
    /**
     * The component used for the root node.
     * Either a string to use a HTML element or a component.
     */
    component: PropTypes /* @typescript-to-proptypes-ignore */.elementType,
    /**
     * If `true`, `subheader` and `title` won't be wrapped by a Typography component.
     * This can be useful to render an alternative Typography variant by wrapping
     * the `title` text, and optional `subheader` text
     * with the Typography component.
     */
    disableTypography: PropTypes.bool,
    /**
     * The content of the component.
     */
    subheader: PropTypes.node,
    /**
     * These props will be forwarded to the subheader
     * (as long as disableTypography is not `true`).
     */
    subheaderTypographyProps: PropTypes.object,
    /**
     * The content of the Card Title.
     */
    title: PropTypes.node,
    /**
     * These props will be forwarded to the title
     * (as long as disableTypography is not `true`).
     */
    titleTypographyProps: PropTypes.object,
  };
  
  export default withStyles(styles, { name: 'MuiCardHeader' })(CardHeader);
  