ant-design/site/theme/template/utils.jsx

// matchMedia polyfill for
// https://github.com/WickyNilliams/enquire.js/issues/82
let enquire;
if (typeof window !== 'undefined') {
  const matchMediaPolyfill = (mediaQuery: string): MediaQueryList => {
    return {
      media: mediaQuery,
      matches: false,
      addListener() {
      },
      removeListener() {
      },
    };
  };
  window.matchMedia = window.matchMedia || matchMediaPolyfill;
  enquire = require('enquire.js');
}

export function getMenuItems(moduleData, locale) {
  const menuMeta = moduleData.map(item => item.meta);
  const menuItems = {};
  menuMeta.sort(
    (a, b) => (a.order || 0) - (b.order || 0)
  ).forEach((meta) => {
    const category = (meta.category && meta.category[locale]) || meta.category || 'topLevel';
    if (!menuItems[category]) {
      menuItems[category] = {};
    }

    const type = meta.type || 'topLevel';
    if (!menuItems[category][type]) {
      menuItems[category][type] = [];
    }

    menuItems[category][type].push(meta);
  });
  return menuItems;
}

export function isZhCN(pathname) {
  return /-cn\/?$/.test(pathname);
}

export function getLocalizedPathname(path, zhCN) {
  const pathname = path.startsWith('/') ? path : `/${path}`;
  if (!zhCN) { // to enUS
    return /\/?index-cn/.test(pathname) ? '/' : pathname.replace('-cn', '');
  } else if (pathname === '/') {
    return '/index-cn';
  } else if (pathname.endsWith('/')) {
    return pathname.replace(/\/$/, '-cn/');
  }
  return `${pathname}-cn`;
}

export function ping(callback) {
  // eslint-disable-next-line
  const url = 'https://private-a' + 'lipay' + 'objects.alip' + 'ay.com/alip' + 'ay-rmsdeploy-image/rmsportal/RKuAiriJqrUhyqW.png';
  const img = new Image();
  let done;
  const finish = (status) => {
    if (!done) {
      done = true;
      img.src = '';
      callback(status);
    }
  };
  img.onload = () => finish('responded');
  img.onerror = () => finish('error');
  img.src = url;
  return setTimeout(() => finish('timeout'), 1500);
}

export function isLocalStorageNameSupported() {
  const testKey = 'test';
  const storage = window.localStorage;
  try {
    storage.setItem(testKey, '1');
    storage.removeItem(testKey);
    return true;
  } catch (error) {
    return false;
  }
}

export function loadScript(src) {
  return new Promise((resolve, reject) => {
    const script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = src;
    script.onload = resolve;
    script.onerror = reject;
    document.head.appendChild(script);
  });
}

export function enquireScreen(cb) {
  /* eslint-disable no-unused-expressions */
  // and (min-width: 320px)
  enquire.register('only screen and (max-width: 768px)', {
    match: () => {
      cb && cb(true);
    },
    unmatch: () => {
      cb && cb();
    },
  });
  /* eslint-enable no-unused-expressions */
}