Function cached

packages/react-aria/src/utils/platform.ts:31–43

(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;
  };
}

export const isMac: () => boolean = cached(function () {
  return testPlatform(/^Mac/i);