/**
 * @hidden
 */
export declare class IgxExpansionPanelTitleDirective {
    cssClass: string;
}
/**
 * @hidden
 */
export declare class IgxExpansionPanelDescriptionDirective {
    cssClass: string;
}
/**
 * @hidden
 */
export declare class IgxExpansionPanelIconDirective {
}