Function cached

packages/@react-aria/test-utils/src/utils.ts:24–36

(fn: () => boolean)

}

function cached(fn: () => boolean) {
  if (process.env.NODE_ENV === 'test') {
    return fn;
  }

  let res: boolean | null = null;
  return () => {
    if (res == null) {
      res = fn();
    }
    return res;
  };
}

const isMac = cached(function () {
  return testPlatform(/^Mac/i);