import { ElementRef, TemplateRef } from '@angular/core';

declare function isUndefined(value: any): value is undefined;
declare function isNull(value: any): value is null;
declare function isUndefinedOrNull(value: any): value is undefined | null;
declare function isArray<T = any>(value: any): value is Array<T>;
declare function isEmpty(value?: any): boolean;
declare function isString(value?: any): value is string;
declare function isNumber(value: any): value is number;
declare function isObject(value: any): value is object;
declare function isFunction(value: any): value is Function;
declare function isDate(value: any): value is Date;
declare function isBoolean(value: any): value is boolean;
declare function isTemplateRef<C = any>(value: any): value is TemplateRef<C>;
declare function isHTMLElement(value: any): value is HTMLElement;
declare function isElementRef(value: any): value is ElementRef;
declare function isFormElement<T = Element>(elementOrRef: ElementRef<T> | T): boolean;
declare function isMacPlatform(userAgent?: string): boolean;

export { isArray, isBoolean, isDate, isElementRef, isEmpty, isFormElement, isFunction, isHTMLElement, isMacPlatform, isNull, isNumber, isObject, isString, isTemplateRef, isUndefined, isUndefinedOrNull };