docs(samples-webpack): updated config and dependencies (#8184)

docs/samples/webpack-getting-started/webpack.config.js

@@ -1,6 +1,6 @@
 const path = require('path');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
-const CleanWebpackPlugin = require('clean-webpack-plugin');
+const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 
 const outputPath = path.resolve(__dirname, 'dist');
@@ -19,7 +19,7 @@ module.exports = {
         test: /\.yaml$/,
         use: [
           { loader: 'json-loader' },
-          { loader: 'yaml-loader' }
+          { loader: 'yaml-loader', options:{ asJSON: true } }
         ]
       },
       {
@@ -32,17 +32,15 @@ module.exports = {
     ]
   },
   plugins: [
-    new CleanWebpackPlugin([
-      outputPath
-    ]),
-    new CopyWebpackPlugin([
+    new CleanWebpackPlugin(),
+    new CopyWebpackPlugin({patterns:[
       {
         // Copy the Swagger OAuth2 redirect file to the project root;
         // that file handles the OAuth2 redirect after authenticating the end-user.
         from: require.resolve('swagger-ui/dist/oauth2-redirect.html'),
         to: './'
       }
-    ]),
+    ]}),
     new HtmlWebpackPlugin({
       template: 'index.html'
     })