【已解决】运行webpack-dev-server时提示Error: Cannot find module ‘webpack-cli/bin/config-yargs‘

1.问题：

module.js:538
    throw err;
    ^

Error: Cannot find module 'webpack/bin/config-yargs'
    at Function.Module._resolveFilename (module.js:536:15)
    at Function.Module._load (module.js:466:25)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object. (D:\saic\dev\expressVue\node_modules\[email protected]@webpack-dev-server\bin\webpack-dev-server.js:54:1)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)

2.原因

当webpack与webpack-dev-server版本不匹配时，会出现如上错误。具体版本如下：

webpack-dev-server与webpack应该成对匹配使用，webpack4.x匹配webpack-dev-server3.x，webpack5.x匹配webpack-dev-server2.x，博主用的时候是最新版本5.x，无法与webpack-dev-server3.x兼容(图中已删除webpack-dev-server3.x)

3.解决方法

3.1 卸载本地旧包

cnpm uninstall webpack-dev-server --save-dev 

3.2 重新下载一对匹配的依赖，这里举个跑通了的例子

cnpm install --save-dev [email protected]
cnpm install --save-dev [email protected]

重启webpack-dev-server，成功跑通