sentry/static/app/utils/guid.tsx

export function uniqueId(): string {
  const s4 = (): string =>
    Math.floor((1 + Math.random()) * 0x10000)
      .toString(16)
      .substring(1);
  return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
}