Error: Cannot find module ‘vue-l

前段时间接到一个朋友帮助，在启动vue3.0项目时候一直报错，网上搜了一堆没有解决问题，究其原因在于环境的配置；

先说一下遇到的问题：

拿到项目直接cnpm install，运行命令npm run serve报错：Cannot find module ‘vue-loader-v16/package.json‘

INFO Starting development server...

ERROR  Error: Cannot find module 'vue-loader-v16/package.json'

Error: Cannot find module 'vue-loader-v16/package.json'

    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:613:15)

    at Function.Module._load (internal/modules/cjs/loader.js:539:25)

    at Module.require (internal/modules/cjs/loader.js:667:17)

    at require (internal/modules/cjs/helpers.js:20:18)

    at api.chainWebpack.webpackConfig (/home/riyad/Desktop/todo_wedevs/todo/node_modules/@vue/cli-service/lib/config/base.js:114:23)

    at webpackChainFns.forEach.fn (/home/riyad/Desktop/todo_wedevs/todo/node_modules/@vue/cli-service/lib/Service.js:236:40)

    at Array.forEach (<anonymous>)

    at Service.resolveChainableWebpackConfig (/home/riyad/Desktop/todo_wedevs/todo/node_modules/@vue/cli-service/lib/Service.js:236:26)

    at Service.resolveWebpackConfig (/home/riyad/Desktop/todo_wedevs/todo/node_modules/@vue/cli-service/lib/Service.js:240:48)

    at PluginAPI.resolveWebpackConfig (/home/riyad/Desktop/todo_wedevs/todo/node_modules/@vue/cli-service/lib/PluginAPI.js:132:25)

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! todo@0.1.0 serve: `vue-cli-service serve`

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the todo@0.1.0 serve script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

npm ERR!    /home/riyad/.npm/_logs/2020-08-20T11_40_44_196Z-debug.log

我以为是少安装了什么包，于是删除nodemoudels，从新安装，然后还是这样；

然后各种网上查阅文档，终于在一篇老外的文档中发现二楼解决办法：

首先删除nodemodels：

更新npm： npm install npm@latest -g

然后：npm i --save-dev vue-loader-v16

删除错误日志

从新cnpm install

然后运行npm run serve

奇迹的事情发生了，没有报错直接运行；