module "pages/index/wx-server-sdk" is not defined

1、错误描述

VM542:1 thirdScriptError
module "pages/index/wx-server-sdk" is not defined; [Component] Event Handler Error @ pages/index/index#bound submitData
Error: module "pages/index/wx-server-sdk" is not defined
    at require (WAService.js:1:1353304)
    at WAService.js:1:1353055
    at ye.submitData (http://127.0.0.1:37728/appservice/pages/index/index.js:61:17)
    at Object.r.safeCallback (WAService.js:1:1088665)
    at WAService.js:1:1280762
    at r (WAService.js:1:1213062)
    at WAService.js:1:1213184
    at WAService.js:1:392894
    at n (http://127.0.0.1:37728/appservice/appservice?t=1567391947377:4092:27790)
    at e.exports.<anonymous> (http://127.0.0.1:37728/appservice/appservice?t=1567391947377:4092:28132)

2、错误原因

     在调用微信小程序中的模块，生成二维码；需要用到wx-server-sdk模块，但是这个模块没有安装

const cloud = require('wx-server-sdk')
    cloud.init()
    exports.main = async (event, context) => {
      try {
        const result = await cloud.openapi.wxacode.createQRCode({
          path: 'page/index/index',
          width: 430
        })
        console.log(result)
        return result
      } catch (err) {
        console.log(err)
        return err
      }
    }

3、解决办法

      使用npm安装wx-server-sdk

npm install --save wx-server-sdk@latest

     但是问题是，本地微信小程序项目下没有package.json文件，无法安装

Administrator@USER-0GUONPPBHK MINGW64 /f/wio
$ npm install --save wx-server-sdk@latest

> protobufjs@6.8.8 postinstall F:\wio\node_modules\protobufjs
> node scripts/postinstall

npm WARN saveError ENOENT: no such file or directory, open 'F:\wio\package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open 'F:\wio\package.json'
npm WARN wio No description
npm WARN wio No repository field.
npm WARN wio No README data
npm WARN wio No license field.

+ wx-server-sdk@0.8.1
added 77 packages from 157 contributors in 22.044s