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// mock external library class method
class Page {
  goto = () => console.log('go to town');
  setCookie = () => console.log('setting a cookie');
}

// extend external library classes with proxy
// proxy is a new global constructor function in es16
// new Proxy(target, handler);

class CustomPageProxy {
  // use the static function to set up the proxy
  static build() {
    const page = new Page();
    const customPageProxy = new CustomPageProxy(page);
    const superPage = new Proxy(customPageProxy, {
      get: function(target, property) {
        return target[property] || page[property]; // check if method exists on extended class else use the method on parent class
      }
    });
    return superPage;
  }
  
  constructor(page) {
    this.page = page;
  }
  sendText = () => {
    this.page.goto();
    this.page.setCookie();
  }
}

const superPage = CustomPageProxy.build();

superPage.sendText();
superPage.goto();