sentry/static/app/utils/guid.tsx

const s4 = (): string =>
  Math.floor((1 + Math.random()) * 0x10000)
    .toString(16)
    .substring(1);

export function uniqueId(): string {
  return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
}