export declare type Target = {
    [key: string]: any;
} | Array<any> | Map<any, any>;
export declare type Value = {
    prop: string;
    value: any;
    obj: {
        [key: string]: any;
    };
};
export declare type Observer = {
    properties?: Array<string>;
    next: (value: Value) => void;
};
export declare type Observable = {
    subscribe: (observer: Observer) => void;
    unsubscribe: (observer?: any) => void;
    destroy: () => void;
    closed: () => boolean;
    proxy: Target;
};
export declare function observe(obj: Target, interval?: number, properties?: Array<string>): Observable;