use standard block.json method with ACF blocks

app/View/Composers/Blocks.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\View\Composers;
+
+use Roots\Acorn\View\Composer;
+use App\Utilities;
+
+class Blocks extends Composer
+{
+    /**
+     * List of views served by this composer.
+     *
+     * @var array
+     */
+    protected static $views = [
+        'layouts.block-acf',
+        'partials.block-*',
+    ];
+
+    /**
+     * Data to be passed to view before rendering.
+     *
+     * @return array
+     */
+    public function with()
+    {
+        return [
+            'CssClasses' => new Utilities\CssClasses,
+        ];
+    }
+}