import { MaybeArray } from "../helper-types";
export type FilterPredicate = (value: any, key?: any, target?: any, source?: any) => boolean;
export type IterateCallback = (value: any, key: any) => void;
export type IterateRecursiveCallback = (value: any, key: any, path: string, obj: any) => void;
export declare function defaultPredicate(value: any, key?: any, target?: any, source?: any): boolean;
export declare function shouldCopyDefault(key: any, value: any): boolean;
export declare class ObjectUtils {
    static compare(a: any, b: any): number;
    static getProperties(obj: any): string[];
    static equals(a: any, b: any, visited?: Set<any>): boolean;
    static evaluate(expr: string, context?: any, res?: any): any;
    static empty(obj: any): boolean;
    static iterate(obj: any, cb: IterateCallback): void;
    static iterateRecursive(obj: any, cb: IterateRecursiveCallback, path?: string): void;
    static getValue(obj: Object, key: string, defaultValue?: any, treeFallback?: boolean): any;
    static mapToPath(target: any, source: any, path: string[]): any;
    static filter(obj: any, predicate: FilterPredicate): any;
    static copy<T>(obj: T): T;
    static assign<T>(target: T, source: any, predicate?: FilterPredicate): T;
    static getType(obj: any): string;
    static isPrimitive(value: any): boolean;
    static isObject(value: any): boolean;
    static isDefined(value: any): boolean;
    static isNullOrUndefined(value: any): boolean;
    static isString(value: any): value is string;
    static isStringWithValue(value: any): value is string;
    static isFunction(value: any): value is Function;
    static isDate(value: any): value is Date;
    static isBlob(value: any): value is Blob;
    static isBoolean(value: any): value is boolean;
    static isNumber(value: any): value is number;
    static isArray<T, U>(value: MaybeArray<T> | ReadonlyArray<T> | U): value is T[];
    static isSet(value: any): value is Set<any>;
    static isConstructor(value: any): boolean;
    static checkInterface(obj: any, interFaceObject: any): boolean;
    static isInterface(obj: any, interFaceObject: any): boolean;
    static pad(obj: any, width: number, chr?: string): string;
    private static copyRecursive;
}