Show warning when manifest is outdated

resources/views/layout.blade.php

@@ -22,6 +22,22 @@
             <sidebar-menu></sidebar-menu>
 
             <main class="md:flex-1 md:overflow-x-hidden">
+                @if (! $assetsAreCurrent)
+                    <div class="bg-blue-100 text-blue-900 px-4 py-3" role="alert">
+                        <div class="flex">
+                            <div class="py-1">
+                                <svg class="fill-current h-6 w-6 text-blue-500 mr-4" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20">
+                                    <path d="M2.93 17.07A10 10 0 1 1 17.07 2.93 10 10 0 0 1 2.93 17.07zm12.73-1.41A8 8 0 1 0 4.34 4.34a8 8 0 0 0 11.32 11.32zM9 11V9h2v6H9v-4zm0-6h2v2H9V5z" />
+                                </svg>
+                            </div>
+                            <div>
+                                <p class="font-medium">The published Compass assets are not up-to-date with the installed version.</p>
+                                <p class="text-sm">To update, run: <code class="ml-2">php artisan compass:publish</code></p>
+                            </div>
+                        </div>
+                    </div>
+                @endif
+
                 <router-view :key="$route.path"></router-view>
             </main>
         </div>

src/Compass.php

@@ -5,6 +5,7 @@
 use Illuminate\Support\Str;
 use Illuminate\Routing\Route;
 use Illuminate\Support\Collection;
+use Illuminate\Support\Facades\File;
 use Illuminate\Support\Facades\Route as RouteFacade;
 
 final class Compass
@@ -140,4 +141,23 @@ public static function ignoreMigrations()
 
         return new static;
     }
+
+    /**
+     * Check if assets are up-to-date.
+     *
+     * src: https://github.com/laravel/telescope/pull/729
+     *
+     * @throws \Illuminate\Contracts\Filesystem\FileNotFoundException
+     * @return bool
+     */
+    public static function assetsAreCurrent()
+    {
+        $publishedPath = public_path('vendor/compass/mix-manifest.json');
+
+        if (! File::exists($publishedPath)) {
+            throw new \RuntimeException('The Compass assets are not published. Please run: php artisan compass:publish');
+        }
+
+        return File::get($publishedPath) === File::get(__DIR__.'/../public/mix-manifest.json');
+    }
 }

src/Http/Controllers/HomeController.php

@@ -15,6 +15,7 @@ public function __invoke()
     {
         return view('compass::layout', [
             'compassScriptVariables' => Compass::scriptVariables(),
+            'assetsAreCurrent' => Compass::assetsAreCurrent(),
         ]);
     }
 }