import { AnyWidget } from '../decorators/construct';
export declare type TypedMap<T> = {
    [key: string]: T;
};
export declare type Callback = () => void;
export declare type PropertyCallback = (property: string) => void;
export declare type WidgetClass<T extends AnyWidget> = {
    new (...args: any[]): T;
};
export declare const pathCallbacks: WeakMap<any, TypedMap<Callback[]>>;
export declare const getSubset: (keys: string[], obj: {}) => {};
export declare const isObject: (obj: any) => boolean;
export declare const deepValue: (obj: {}, path?: string) => any;
export declare const merge: (a: any, b: any) => any;
export declare const ensure: <T>(map: WeakMap<{}, T> | Map<{}, T>, obj: any, defaultValue: any) => T;
export declare const propertyCallbacks: WeakMap<object, TypedMap<PropertyCallback[]>>;
export declare const addPropertyListener: (obj: object, property: string, callback: PropertyCallback) => void;
export declare const createObjectPropertyListener: (obj: object, pathStr: string, callback: Callback) => void;