export type DeepPartial<T> = {
  [P in keyof T]?: T[P] extends Array<infer U>
    ? Array<DeepPartial<U>>
    : T[P] extends ReadonlyArray<infer U>
      ? ReadonlyArray<DeepPartial<U>>
      : DeepPartial<T[P]>
};

export type KeysOfType<T, TProp> = { [P in keyof T]: T[P] extends TProp? P : never}[keyof T];

export type FunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? K : never }[keyof T];
export type FunctionProperties<T> = Pick<T, FunctionPropertyNames<T>>;

export type NonFunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? never : K }[keyof T];
export type NonFunctionProperties<T> = Pick<T, NonFunctionPropertyNames<T>>;
export type DeepWriteable<T> = { -readonly [P in keyof T]: DeepWriteable<T[P]> };