fix typecheck error that i missed

Author: BIGjuevos

src/__tests__/fullscreen.test.ts

@@ -3,7 +3,7 @@ import { isFullscreenEnabled, requestFullscreen, exitFullscreen, isFullscreenAct
 
 describe("fullscreen utils", () => {
   beforeEach(() => {
-    // Reset document properties by setting to undefined
+    // Reset document properties by deleting them
     const doc = document as Document & {
       fullscreenEnabled?: boolean;
       webkitFullscreenEnabled?: boolean;
@@ -12,12 +12,25 @@ describe("fullscreen utils", () => {
       exitFullscreen?: () => Promise<void>;
       webkitExitFullscreen?: () => Promise<void>;
     };
-    doc.fullscreenEnabled = undefined;
-    doc.webkitFullscreenEnabled = undefined;
-    doc.fullscreenElement = undefined;
-    doc.webkitFullscreenElement = undefined;
-    doc.exitFullscreen = undefined;
-    doc.webkitExitFullscreen = undefined;
+    // Use delete with type assertion to avoid TypeScript errors
+    if ('fullscreenEnabled' in doc) {
+      delete (doc as any).fullscreenEnabled;
+    }
+    if ('webkitFullscreenEnabled' in doc) {
+      delete (doc as any).webkitFullscreenEnabled;
+    }
+    if ('fullscreenElement' in doc) {
+      delete (doc as any).fullscreenElement;
+    }
+    if ('webkitFullscreenElement' in doc) {
+      delete (doc as any).webkitFullscreenElement;
+    }
+    if ('exitFullscreen' in doc) {
+      delete (doc as any).exitFullscreen;
+    }
+    if ('webkitExitFullscreen' in doc) {
+      delete (doc as any).webkitExitFullscreen;
+    }
   });
 
   it("detects fullscreen support via fullscreenEnabled", () => {