import { ChangeDetectorRef } from '@angular/core';
export declare function trimString(value: string | null | undefined): string;
/**
 * CSS transition duration as defined in CSS
 */
export declare const TRANSITION_DURATION: {
    superfast: number;
    fast: number;
    moderate: number;
    slow: number;
};
export declare const Keys: {
    enter: string;
    space: string;
    backspace: string;
    esc: string;
    tab: string;
    arrowRight: string;
    arrowLeft: string;
};
export type Size = 'small' | 'medium' | 'large' | 'xlarge' | 'xxlarge';
export type Aspect = 'solid' | 'basic';
export type Kind = 'primary' | 'secondary' | 'inverted' | 'destructive';
export declare class PositionStyle {
    position?: string;
    left?: string;
    right?: string;
    top?: string;
    bottom?: string;
    width?: string;
    transform?: string;
}
export declare const markForCheck: (cdr: ChangeDetectorRef) => void;
export declare const detectChanges: (cdr: ChangeDetectorRef) => void;
export declare const getPositionedParent: (element: HTMLElement) => HTMLElement;
export declare function getFixedRootParent(element: HTMLElement): HTMLElement;
export declare function getFixedRootParentIfAny(element: HTMLElement): HTMLElement | undefined;
export declare function hasPositionFixedParent(element: HTMLElement): boolean;
export declare function getScrollableParent(element: HTMLElement): HTMLElement;
export declare const getRealPosition: (element: HTMLElement) => {
    top: number;
    left: number;
};
export declare const getVirtualScrollParentPosition: (element: HTMLElement) => {
    bottom: number;
    right: number;
} | null;
export declare function cssAsNumber(css: string): number;
export declare function isVisibleInViewport(element?: HTMLElement): boolean;