export declare type Optional<T> = {
    [P in keyof T]+?: T[P];
};
export declare type Map<V = any> = {
    [key: string]: V;
};
export declare type Constructor<T> = {
    new (...params: any[]): T;
};
export declare type Callback<T> = (value: T) => void;
export declare type ErrorHandler = (error: Error) => void;
export declare type AllowExtra<T> = {
    [K in keyof T]: T[K];
} & {
    [key: string]: any;
};