export declare class CardHeader {
    /**
     * The image'#39;s type (e.g. square border or circular border).
     */
    private imageStyle?;
    /**
     * The URL of the image in the card header.
     */
    private imageUrl?;
    /**
     * The subtitle of the card header.
     */
    private subtitle?;
    /**
     * The title must be specified. The header has a fixed height: if both a
     * title and subtitle is specified, each will take up 1 line. If only the
     * title is specified, it will take up both lines.
     */
    private title?;
    getImageStyle(): string;
    setImageStyle(value: string): CardHeader;
    getImageUrl(): string;
    setImageUrl(value: string): CardHeader;
    getSubtitle(): string;
    setSubtitle(value: string): CardHeader;
    getTitle(): string;
    setTitle(value: string): CardHeader;
}