import { NgZone } from '@angular/core';
import { OperatorFunction } from 'rxjs';
export declare function toInteger(value: any): number;
export declare function toString(value: any): string;
export declare function getValueInRange(value: number, max: number, min?: number): number;
export declare function isString(value: any): value is string;
export declare function isNumber(value: any): value is number;
export declare function isInteger(value: any): value is number;
export declare function isDefined(value: any): boolean;
export declare function padNumber(value: number): string;
export declare function regExpEscape(text: string): string;
export declare function closest(element: HTMLElement, selector?: string): HTMLElement | null;
export declare function runInZone<T>(zone: NgZone): OperatorFunction<T, T>;