import { Observable } from 'rxjs/Observable';
import { isArray } from 'rxjs/util/isArray';
import { isFunction } from 'rxjs/util/isFunction';
import { JsonMap } from '../json/json.utils';
declare function _isString(aValue: any): aValue is string;
/**
 * Tests if a value is a number value
 *
 * @param aValue    the value
 * @return true if the value is number, else false
 */
declare function _isNumber(aValue: any): aValue is number;
/**
 * Tests if a value is a date
 *
 * @param aValue    the value
 * @return true if the value is date, else false
 */
declare function _isDate(aValue: any): aValue is Date;
/**
 * Tests if a value is a boolean value
 *
 * @param aValue    the value
 * @return true if the value is boolean, else false
 */
declare function _isBoolean(aValue: any): aValue is boolean;
declare function _isUndefined(aObject: any): aObject is undefined;
declare function _isNil(aObject: any): aObject is null | undefined;
declare function _isNotNil(aObject: any): boolean;
declare function _isPlainObject(aObject: any): aObject is JsonMap;
declare function _isObservable(aValue: any): aValue is Observable<any>;
/**
 * Tests if a URL is an absolute URL
 *
 * @param aUrl  the URL string
 * @return true if the URL is absolute, else false
 */
declare function _isAbsoluteUrl(aUrl: string): boolean;
export declare type IsPredicate<T> = (aValue: any) => aValue is T;
/**
 * Tests if all elements of the array are of a particular type
 *
 * @param aValue the value to test
 * @param aPredicate the predicate to test each element with
 *
 * @return true if the value is an array and all elements are of the specific type
 */
declare function _isArrayOf<T>(aValue: any, aPredicate: IsPredicate<T>): aValue is T[];
/**
 * Tests if all elements of the array are of type string
 *
 * @param aValue the value to test
 * @param aPredicate the predicate to test each element with
 *
 * @return true if the value is an array and all elements are of the specific type
 */
declare function _isStringArray(aValue: any): aValue is string[];
/**
 * Tests if all fields of an object are of a particular type
 *
 * @param aValue the value to test
 * @param aPredicate the predicate to test each element with
 *
 * @return true if the value is an array and all elements are of the specific type
 */
declare function _isObjectOf<T>(aValue: any, aPredicate: IsPredicate<T>): aValue is {
    [key: string]: T;
};
/**
 * Tests if all fields of an object are of a particular type
 *
 * @param aValue the value to test
 * @param aPredicate the predicate to test each element with
 *
 * @return true if the value is an array and all elements are of the specific type
 */
declare function _isParseableAsDate(aValue: any): aValue is string | number | Date;
export declare type Predicate<T> = (aValue: T) => boolean;
export declare type EqualsPredicate<T> = (aLeft: T, aRight: T) => boolean;
export { _isNil as isNil, _isNotNil as isNotNil, _isUndefined as isUndefined, _isString as isString, _isNumber as isNumber, _isBoolean as isBoolean, _isObservable as isObservable, _isAbsoluteUrl as isAbsoluteURL, isArray, isFunction, _isDate as isDate, _isParseableAsDate as isParseableAsDate, _isPlainObject as isPlainObject, _isStringArray as isStringArray, _isArrayOf as isArrayOf, _isObjectOf as isObjectOf };