Поправки параметров CopyWebpackPlugin

build/webpack.dev.config.js

@@ -39,6 +39,6 @@ module.exports = merge(baseWpConfig, {
             template: `${clientDir}/index.html.template`,
             filename: `${publicDir}/index.html`
         }),
-        new CopyWebpackPlugin({patterns: [{from: `${clientDir}/assets/*`, to: `${publicDir}/`}]})
+        new CopyWebpackPlugin({patterns: [{context: `${clientDir}/assets`, from: `${clientDir}/assets/*`, to: `${publicDir}/`}]})
     ]
 });

build/webpack.prod.config.js

@@ -52,7 +52,7 @@ module.exports = merge(baseWpConfig, {
             filename: `${publicDir}/index.html`
         }),
         new CopyWebpackPlugin({patterns: 
-            [{from: `${clientDir}/assets/*`, to: `${publicDir}/`, context: `${clientDir}/assets` }]
+            [{context: `${clientDir}/assets`, from: `${clientDir}/assets/*`, to: `${publicDir}/` }]
         }),
     ]
 });