crypto.randomUUID의 Polyfill

type UUID = `${string}-${string}-${string}-${string}-${string}`;

const FN_NAME = "randomUUID";
const BASE_STR = [1e7, 1e3, 4e3, 8e3, 1e11].join("-");

/**
 * UUID v4 생성
 * 브라우저가 randomUUID를 지원하지 않으면 폴리필 구현 실행
 */
export function randomUUID(): UUID {
  const api = crypto;
  if (FN_NAME in api) return api[FN_NAME]();

  return BASE_STR.replace(/[018]/g, replacer) as UUID;
}

function replacer(char: string): string {
  const random = crypto.getRandomValues(new Uint8Array(1))[0];
  const int = Number.parseInt(char);
  return (int ^ (random & (15 >> (int / 4)))).toString(16);
}