你好，云函数 puppeteer 不需要安装，直接 require 使用即可。参考：

// 云函数入口文件
const cloud = require('wx-server-sdk')


cloud.init()


// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
  const puppeteer = require('puppeteer');


  const browser = await puppeteer.launch({
    args: ['--no-sandbox']
  });
  const page = await browser.newPage();
  await page.goto('https://example.com');
  const buf = await page.screenshot();


  await browser.close();


  return {
    event,
    buf,
    openid: wxContext.OPENID,
    appid: wxContext.APPID,
    unionid: wxContext.UNIONID,
  }
}