configuration has an unknown property '__vueOptions__'

[wotermelon]

vue init webpack xxx

first time to npm run build had no problems, when continue to build it make a mistake.

webpack 2 no longer allows custom properties in configuration.

WebpackOptionsValidationError: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration has an unknown property '__vueOptions__'. These properties are valid:
   object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry, externals?, loader?, module?, name?, node?, output?, performance?, plugins?, prof
ile?, 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: {
           __vueOptions__: ...
         }
       })
     ]

[posva]

I couldn't find vueOptions on the webpack template, so you probably added that in a way that is not supported by webpack 2. You should follow the help provided in the output