type ObjToKeyValUnion<T> = {
  [K in keyof T]: { key: K; value: T[K] };
}[keyof T];

type ObjToKeyValArray<T> = {
  [K in keyof T]: [K, T[K]];
}[keyof T];

type ObjToSelectedValueUnion<T> = {
  [K in keyof T]: T[K];
}[keyof T];

type Optional<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;

type GetOptional<T> = {
  [P in keyof T as T[P] extends Required<T>[P] ? never : P]: T[P];
};