/**
 * Headline text displayed at the top of an `r-popover`. Place in the `headline` slot of `r-popover`.
 *
 * Example
 * ```
 * <r-popover>
 *   <r-popover-headline>Need help?</r-popover-headline>
 * </r-popover>
 * ```
 *
 * @slot - Headline text displayed at the top of the popover
 */
export declare class PopoverHeadline {
    render(): any;
}