From 94bd99be5c3a7eed4d004dddfeea13db0ff8128b Mon Sep 17 00:00:00 2001
From: James Chen <dumganhar@gmail.com>
Date: Thu, 12 Dec 2024 15:38:02 +0800
Subject: [PATCH 1/2] fixed #3d-tasks/18679: Invoke toLowerCase of undefined.
 Enum should be used instead of ccenum to generate reverse key.

---
 cocos/primitive/primitive.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/cocos/primitive/primitive.ts b/cocos/primitive/primitive.ts
index 9455de24558..8d616eeacce 100644
--- a/cocos/primitive/primitive.ts
+++ b/cocos/primitive/primitive.ts
@@ -26,7 +26,7 @@ import { ccclass, type, serializable, editable } from 'cc.decorator';
 import { createMesh } from '../3d/misc';
 import { Mesh } from '../3d/assets/mesh';
 import * as primitives from '.';
-import { ccenum, cclegacy } from '../core';
+import { Enum, cclegacy } from '../core';
 
 enum PrimitiveType {
     BOX = 0,
@@ -38,7 +38,7 @@ enum PrimitiveType {
     PLANE = 6,
     QUAD = 7,
 }
-ccenum(PrimitiveType);
+Enum(PrimitiveType);
 
 /**
  * @en
@@ -81,7 +81,8 @@ export class Primitive extends Mesh {
      * 根据`type`和`info`构建相应的网格。
      */
     public onLoaded (): void {
-        createMesh(primitives[PrimitiveType[this.type].toLowerCase()](this.info), this);
+        const factory = primitives[PrimitiveType[this.type].toLowerCase()] as (arg: typeof this.info) => primitives.IGeometry;
+        createMesh(factory(this.info), this);
     }
 }
 

From 6c4257938f335123c68e9bac6550a9d4d5eefb74 Mon Sep 17 00:00:00 2001
From: James Chen <dumganhar@gmail.com>
Date: Fri, 13 Dec 2024 09:26:12 +0800
Subject: [PATCH 2/2] Add a comment for  PrimitiveType.

---
 cocos/primitive/primitive.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cocos/primitive/primitive.ts b/cocos/primitive/primitive.ts
index 8d616eeacce..84a09ad8926 100644
--- a/cocos/primitive/primitive.ts
+++ b/cocos/primitive/primitive.ts
@@ -38,7 +38,7 @@ enum PrimitiveType {
     PLANE = 6,
     QUAD = 7,
 }
-Enum(PrimitiveType);
+Enum(PrimitiveType); // Need reversed keys in Primitive.onLoaded, so use Enum to generate reversed keys.
 
 /**
  * @en