Upgrade to Laravel Mix 6

package.json

@@ -1,7 +1,18 @@
 {
-  "private": true,
-  "devDependencies": {
-    "gulp": "^3.8.8",
-    "laravel-elixir": "*"
-  }
+    "private": true,
+    "scripts": {
+        "dev": "npm run development",
+        "development": "mix",
+        "watch": "mix watch",
+        "watch-poll": "mix watch -- --watch-options-poll=1000",
+        "hot": "mix watch --hot",
+        "prod": "npm run production",
+        "production": "mix --production"
+    },
+    "devDependencies": {
+        "axios": "^0.21",
+        "laravel-mix": "^6.0.6",
+        "lodash": "^4.17.19",
+        "postcss": "^8.1.14"
+    }
 }

webpack.mix.js

@@ -0,0 +1,17 @@
+const mix = require('laravel-mix');
+
+/*
+ |--------------------------------------------------------------------------
+ | Mix Asset Management
+ |--------------------------------------------------------------------------
+ |
+ | Mix provides a clean, fluent API for defining some Webpack build steps
+ | for your Laravel applications. By default, we are compiling the CSS
+ | file for the application as well as bundling up all the JS files.
+ |
+ */
+
+mix.js('resources/js/app.js', 'public/js')
+    .postCss('resources/css/app.css', 'public/css', [
+        //
+    ]);