export declare class DropdownUtils {
    private constructor();
    /**
     * Si appendTo est défini, trouver le container auquel le rattacher (element ou classe)
     * Si le container parent ne correspond ni au body ni à une modale, le placer en position relative
     *  */
    static setParentContainer(appendTo: HTMLElement | string, comboBox: HTMLElement): HTMLElement | undefined;
    /**
     * Get viewport for overlay position
     * From primeNG  */
    static getViewport(): {
        width: number;
        height: number;
    };
    /**
     * Get scroll from top for overlay position
     * From primeNG */
    static getWindowScrollTop(): number;
    static isBodyOrFixedElement(container: HTMLElement): boolean;
}