ERROR in Entry module not found: Error: Can't resolve 'webpack-dev-server --open' in 'D:\study\webpack-demo'

ERROR in (webpack)-dev-server/client?http://localhost:8080
Module build failed: Error: ENOENT: no such file or directory, open 'D:\study\webpack-demo\node_modules\webpack-dev-server\client\index.js'
 @ multi (webpack)-dev-server/client?http://localhost:8080 ./src/index.js app[0]

ERROR in multi (webpack)-dev-server/client?http://localhost:8080 webpack-dev-server --open
Module not found: Error: Can't resolve 'webpack-dev-server --open' in 'D:\study\webpack-demo'
 @ multi (webpack)-dev-server/client?http://localhost:8080 webpack-dev-server --open start[1]

当你运行得项目中出现以上报错，看看webpack.config.js 文件中 配置是否出错？

 derServer: {
     	contentBase: './dist' 
  },

解决方法：本地出错得原因是 ， 键盘敲错了！或者 改正重新运行即可

devServer: { // 此处配置名称写错了
contentBase: ‘./dist’
},

entry: {
    app: './src/index.js',
    print: './src/print.js',
    "start": "webpack-dev-server --open" //  或者此处引用错误
  },

总结： 是webpack 原生结构的配置写错了