How to use the intl-messageformat/src/main.js function in intl-messageformat

var key = arguments[0];
      if (!key || !resources || !language || !resources[language]) return;

      // Cache the key/value pairs for the same language, so that we don't
      // do extra work if we're just reusing strings across an application.
      var translatedValue = resources[language][key];

      if (!translatedValue) {
        return this.useKeyIfMissing ? key : "";
      }

      var messageKey = key + translatedValue;
      var translatedMessage = proto.__localizationCache.messages[messageKey];

      if (!translatedMessage) {
        translatedMessage = new IntlMessageFormat(
          translatedValue,
          language,
          formats
        );
        proto.__localizationCache.messages[messageKey] = translatedMessage;
      }

      var args = {};
      for (var i = 1; i < arguments.length; i += 2) {
        args[arguments[i]] = arguments[i + 1];
      }

      return translatedMessage.format(args);
    }.bind(this);
  },

var key = arguments[0];
    if (!key || !window.localeResources || !(this.language && window.language) || !window.localeResources[this.language])
      return key;

    var translatedValue = window.localeResources[this.language || window.language][key];

    if (!translatedValue) {
      return key;
    }

    var messageKey = key + translatedValue;
    var translatedMessage = window.__localizationCache.messages[messageKey];

    if (!translatedMessage) {
      translatedMessage =
          new IntlMessageFormat(translatedValue, this.language, {});
      window.__localizationCache.messages[messageKey] = translatedMessage;
    }

    var args = {};
    for (var i = 1; i < arguments.length; i += 2) {
      args[arguments[i]] = arguments[i + 1];
    }

    return translatedMessage.format(args);
  }