Add all files

app/Observers/InvoiceItemObserver.php

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+<?php
+
+namespace App\Observers;
+
+use App\Events\InvoiceItem as InvoiceItemEvent;
+use App\Models\InvoiceItem;
+
+class InvoiceItemObserver
+{
+    /**
+     * Handle the InvoiceItem "creating" event.
+     */
+    public function creating(InvoiceItem $invoice): void
+    {
+        event(new InvoiceItemEvent\Creating($invoice));
+    }
+
+    /**
+     * Handle the InvoiceItem "created" event.
+     */
+    public function created(InvoiceItem $invoice): void
+    {
+        event(new InvoiceItemEvent\Created($invoice));
+    }
+
+    /**
+     * Handle the InvoiceItem "updating" event.
+     */
+    public function updating(InvoiceItem $invoice): void
+    {
+        event(new InvoiceItemEvent\Updating($invoice));
+    }
+
+    /**
+     * Handle the InvoiceItem "updated" event.
+     */
+    public function updated(InvoiceItem $invoice): void
+    {
+        event(new InvoiceItemEvent\Updated($invoice));
+    }
+
+    /**
+     * Handle the InvoiceItem "deleted" event.
+     */
+    public function deleted(InvoiceItem $invoice): void
+    {
+        event(new InvoiceItemEvent\Deleted($invoice));
+    }
+}