From 35e3eb9ce645a78a9dc93492077be62143fcc990 Mon Sep 17 00:00:00 2001
From: Guy Sartorelli <36352093+GuySartorelli@users.noreply.github.com>
Date: Thu, 22 Aug 2024 12:30:09 +1200
Subject: [PATCH] API Deprecate extension to be replaced with config (#1243)

---
 src/Extensions/ElementalLeftAndMainExtension.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/Extensions/ElementalLeftAndMainExtension.php b/src/Extensions/ElementalLeftAndMainExtension.php
index 81d8ba0e..a98c6fa3 100644
--- a/src/Extensions/ElementalLeftAndMainExtension.php
+++ b/src/Extensions/ElementalLeftAndMainExtension.php
@@ -4,13 +4,23 @@
 
 use SilverStripe\Admin\LeftAndMain;
 use SilverStripe\Core\Extension;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\View\Requirements;
 
 /**
  * @extends Extension<LeftAndMain>
+ * @deprecated 5.3.0 Will be replaced with YAML configuration
  */
 class ElementalLeftAndMainExtension extends Extension
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(
+            fn () => Deprecation::notice('5.3.0', 'Will be replaced with YAML configuration', Deprecation::SCOPE_CLASS)
+        );
+        parent::__construct();
+    }
+
     public function init()
     {
         Requirements::add_i18n_javascript('dnadesign/silverstripe-elemental:client/lang');