我有一些问题，当我使用代理与 puppet 库。
这是类定义

const puppeteer = require("puppeteer");

class CustomPage {
  static async build() {
    const browser = await puppeteer.launch({ headless: false });
    const page = await browser.newPage();
    const customPage = new CustomPage(page);
    const superPage = new Proxy(customPage, {
      get: function (target, property) {
        //pay attention to the order between browser and page because of an issue
        return customPage[property] || browser[property] || page[property];
      }
    });
    console.log("superPage in CustomPage class definition", superPage);
    return superPage;
  }
  constructor(page) {
    this.page = page;
  }
}

module.exports = CustomPage;

这是我运行它时得到的错误

TypeError: Cannot read private member from an object whose class did not declare it

       7 | beforeEach(async () => {
       8 |   page = await Page.build();
    >  9 |   await page.goto("localhost:3000");
         |              ^
      10 | });

你能帮我一下吗？