export type FilterFlags<Base, Condition> = {
    [Key in keyof Base]: Base[Key] extends Condition ? Key : never;
};
export type AllowedNames<Base, Condition> = FilterFlags<Base, Condition>[keyof Base];
export type SubType<Base, Condition> = Pick<Base, AllowedNames<Base, Condition>>;
export type WithSelf<S, F extends (...a: any[]) => any> = (self: S, ...args: Parameters<F>) => ReturnType<F>;
export type FuncOrMethod<T, F extends () => any> = WithSelf<T, F> | AllowedNames<T, F>;
export type ClassOf<T> = Function & {
    prototype: T;
};
export type ConstructorOf<T> = {
    new (...args: any[]): T;
    prototype: T;
};