유니온 없앴는데 맞게 한건가요??

interface Generic<T> {
  value: T;
  selected: boolean;
}

const emails: Generic<string>[] = [
  { value: "naver.com", selected: true },
  { value: "gmail.com", selected: false },
  { value: "hanmail.net", selected: false },
];


const numberOfProducts: Generic<number>[] = [
  { value: 1, selected: true },
  { value: 2, selected: false },
  { value: 3, selected: false },
];

function createDropdownItem(item : Generic<string>):HTMLOptionElement {
  const option = document.createElement("option");
  option.value = item.value.toString();
  option.innerText = item.value.toString();
  option.selected = item.selected;
  return option;
}

// NOTE: 이메일 드롭 다운 아이템 추가
emails.forEach(function (email : Generic<string>): void {
  const item = createDropdownItem(email);
  const selectTag = document.querySelector("#email-dropdown");
  selectTag.appendChild(item);
});