Update with-hashed-statics example (#5100)

* Add file-loader to webpack config

* Fix lint problems

examples/with-hashed-statics/.babelrc

@@ -1,13 +0,0 @@
-{
-  "presets": ["next/babel"],
-  "plugins": [
-    [
-      "transform-assets",
-      {
-        "extensions": ["txt", "svg", "png"],
-        "regExp": ".*/static/(.+)",
-        "name": "/static/[1]?[sha512:hash:base64:7]"
-      }
-    ]
-  ]
-}

examples/with-hashed-statics/next.config.js

@@ -0,0 +1,19 @@
+module.exports = {
+  webpack: config => {
+    config.module.rules.push({
+      test: /\.(txt|jpg|png|svg)$/,
+      use: [
+        {
+          loader: 'file-loader',
+          options: {
+            context: '',
+            emitFile: true,
+            name: '[path][name].[hash].[ext]'
+          }
+        }
+      ]
+    })
+
+    return config
+  }
+}

examples/with-hashed-statics/package.json

@@ -9,5 +9,8 @@
     "next": "latest",
     "react": "16.2.0",
     "react-dom": "16.2.0"
+  },
+  "devDependencies": {
+    "file-loader": "2.0.0"
   }
 }