import { Observable } from 'rxjs';
import { DeferredPromise } from './interfaces';
export declare const noop: () => void;
export declare const isEmpty: (array: any[]) => boolean;
export declare function isPromise(val: any): val is Promise<any>;
export declare function isObservable(val: any): val is Observable<any>;
export declare function isSymbol(val: any): val is symbol;
export declare function isNum(val: any): val is number;
export declare function isObj(val: any): val is Object;
export declare function isNil(val: any): val is undefined | null;
export declare function isString(val: any): val is string;
export declare function isBool(val: any): val is boolean;
export declare function isIterable(val: any): val is Iterable<any>;
export declare function isFunc(val: any): val is Function;
export declare function isUndef(val: any): val is undefined;
export declare function runSeries<T>(promises: Promise<T>[]): Promise<void>;
export declare function concat(...props: any[]): any[];
export declare function createDeferredPromise<T>(): DeferredPromise<T>;
export declare function transformResult<T>(resultOrDeferred: T | Promise<T> | Observable<T>): Promise<T>;
export declare function getEntryValues<T, S = string>(entries: IterableIterator<[S, T]> | Array<[S, T]>): T[];
export declare function promisify<T, F extends Function>(fn: F): (...args: any[]) => Promise<T>;
export declare function flatten<T>(arr: any[]): T[];
export declare function pick<T>(from: any[], by: any[]): T[];
export declare function omit<T>(from: any[], by: any[]): T[];
export declare function isNode(): boolean;
export declare function getDeferred<T>(value: any): Promise<T>;
export declare function toArrayPromise<T>(source$: Observable<T>): Promise<T[]>;