(function (open) {
    XMLHttpRequest.prototype.open = function (method, url, async, user, password) {
      this.addEventListener("load", function () {
        if (method === "PUT") {
          window.top.postMessage('jupytermessage', '*');
        }
      });
      open.call(this, method, url, async, user, password);
    };
  })(XMLHttpRequest.prototype.open);
  
  (function (fetch) {
    window.fetch = function (url, options) {
      options = options || {}
      return fetch.apply(this, arguments).then(function (response) {
        try {
          if (options.method === "PUT" || (typeof url === "object" && url.method === "PUT")) {
            window.top.postMessage('jupytermessage', '*');
          }
        } catch (error) {
  
        }
        return response; 
      });
    };
  
  })(window.fetch);
  
  function saveCode() {
    var saveEvent = new KeyboardEvent('keydown', {
      key: 's',
      ctrlKey: true
    });
  
    document.dispatchEvent(saveEvent);
  }
  
  function onReceiveMessage(e) {
    try {
      if (mes.type === 'saveCode') {
        saveCode()
      }
    } catch (error) {
      console.log('error:', error, e);
    }
  }
  
  (function () {
    setInterval(() => {
      saveCode()
    }, 5000)
  })();
  window.addEventListener('message', onReceiveMessage);