export declare type IPropertyDescriptor<T> = {
    configurable?: boolean;
    enumerable?: boolean;
    value?: T;
    writable?: boolean;
    get?(): T;
    set?(v: T): void;
};
/**
 * @ignore
 */
export declare function defineImmutable<T, K extends keyof T>(o: T, p: K, target: T[K]): any;
/**
 * @ignore
 */
export declare function defineProperties<T>(o: T, properties: {
    [K in keyof T]?: IPropertyDescriptor<T[K]>;
}): any;