Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

 - configuration has an unknown property 'devSever'. These properties are valid:

   object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry, externals?, loader?, module?, name?, node?, output?, parallelism?, performance?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, stats?, target?, watch?, watchOptions? }

   For typos: please correct them.

   For loader options: webpack 2 no longer allows custom properties in configuration.

     Loaders should be updated to allow passing options via loader options in module.rules.

     Until loaders are updated one can use the LoaderOptionsPlugin to pass these options to the loader:

     plugins: [

       new webpack.LoaderOptionsPlugin({

         // test: /\.xxx$/, // may apply this only for some modules

         options: {

           devSever: ...

         }

       })

     ]

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! 01.webpack-study@1.0.0 dev2: `cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js`

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the 01.webpack-study@1.0.0 dev2 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!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2018-08-19T08_33_01_555Z-debug.log