function addressOrThrow(value: unknown) {
  if (typeof value !== "object" || value == null) throw new TypeError();

  if (!("street" in value) || typeof value.street !== "string")
    throw new TypeError();

  if (!("houseNumber" in value) || typeof value.houseNumber !== "number")
    throw new TypeError();

  return value;
}

function addressOrThrowTG(value: unknown): value is Address {
  addressOrThrow(value);
  return true;
}

function personOrThrow(value: unknown) {
  if (typeof value !== "object" || value == null) throw new TypeError();

  if (!("firstName" in value) || typeof value.firstName !== "string")
    throw new TypeError();

  if (!("lastName" in value) || typeof value.lastName !== "string")
    throw new TypeError();

  if ("middleName" in value && typeof value.middleName !== "string")
    throw new TypeError();

  if (!("addresses" in value) || !Array.isArray(value.addresses))
    throw new TypeError();

  if (!value.addresses.every(addressOrThrowTG))
    throw new TypeError();

  return value;
}

type Address = ReturnType<typeof addressOrThrow>;

type Person = ReturnType<typeof personOrThrow>;