/// <reference types="node" />
import { Sources, Update } from './interfaces';
import { EventEmitter } from 'events';
export declare function createId(): any;
export declare function filter(update: Update, sources: Sources): boolean;
export declare function order(a: Update, b: Update): number;
export declare function sort(hist: Update[]): Update[];
export declare function protoIsIllegal(s: EventEmitter): void;
export declare const isUndefined: (obj: any) => obj is undefined;
export declare const isObject: (fn: any) => fn is object;
export declare const validatePath: (path?: string | undefined) => string;
export declare const isFunction: (fn: any) => boolean;
export declare const isString: (fn: any) => fn is string;
export declare const isConstructor: (fn: any) => boolean;
export declare const isNil: (obj: any) => obj is null | undefined;
export declare const isEmpty: (array: any) => boolean;
export declare const isSymbol: (fn: any) => fn is symbol;
export declare function isPromise(obj: any): boolean;