From dcace7e1a031c0cd48823e033dab3883d8ad0cd2 Mon Sep 17 00:00:00 2001
From: Kristiyan Kostadinov <crisbeto@abv.bg>
Date: Fri, 23 Aug 2024 14:02:09 +0200
Subject: [PATCH] fix(cdk/drag-drop): error if ngDevMode is undefined

Fixes that the drag&drop module wasn't checking for `ngDevMode` correctly.

Fixes #29633.
---
 src/cdk/drag-drop/drag-ref.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cdk/drag-drop/drag-ref.ts b/src/cdk/drag-drop/drag-ref.ts
index 3d79211636d4..a8c138a05d37 100644
--- a/src/cdk/drag-drop/drag-ref.ts
+++ b/src/cdk/drag-drop/drag-ref.ts
@@ -829,7 +829,10 @@ export class DragRef<T = any> {
       const parent = element.parentNode as HTMLElement;
       const placeholder = (this._placeholder = this._createPlaceholderElement());
       const anchor = (this._anchor =
-        this._anchor || this._document.createComment(ngDevMode ? 'cdk-drag-anchor' : ''));
+        this._anchor ||
+        this._document.createComment(
+          typeof ngDevMode === 'undefined' || ngDevMode ? 'cdk-drag-anchor' : '',
+        ));
 
       // Insert an anchor node so that we can restore the element's position in the DOM.
       parent.insertBefore(anchor, element);