Fixed the deletion of a file

src/FieldCollection.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Eminiarts\Tabs;
+
+use Illuminate\Support\Arr;
+use Laravel\Nova\Fields\FieldCollection as NovaFieldCollection;
+
+class FieldCollection extends NovaFieldCollection
+{
+    /**
+     * Retrieve the field match matches the instance.
+     *
+     * @param  string  $type
+     * @return \Eminiarts\Tabs\FieldCollection
+     */
+    public function whereInstanceOf($type)
+    {
+        return $this->flatMap(function ($tab) use ($type) {
+            return collect(Arr::get($tab, 'fields'))->whereInstanceOf($type);
+        });
+    }
+
+    public function findFieldByAttribute($attribute, $default = null)
+    {
+        foreach ($this->items as $field) {
+            if (isset($field->attribute) && $field->attribute === $attribute) {
+                return $field;
+            }
+
+            // Search the fields inside tabs.
+            if (is_array($field) && isset($field['component']) && $field['component'] === 'tabs') {
+                return static::make($field['fields'])->findFieldByAttribute($attribute, $default);
+            }
+        }
+
+        return null;
+    }
+}

src/TabsOnEdit.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace Eminiarts\Tabs;
 
 use Laravel\Nova\Fields\FieldCollection;