From c23153d82eb2aa57d254dd362a78383defec3968 Mon Sep 17 00:00:00 2001
From: edison <daiwei521@126.com>
Date: Thu, 15 Jul 2021 23:37:11 +0800
Subject: [PATCH] fix(compiler-core): fix forwarded slots detection on template
 slots (#4124)

fix #4123
---
 packages/compiler-core/__tests__/transforms/vSlot.spec.ts | 7 +++++++
 packages/compiler-core/src/transforms/vSlot.ts            | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/packages/compiler-core/__tests__/transforms/vSlot.spec.ts b/packages/compiler-core/__tests__/transforms/vSlot.spec.ts
index beddd212..bb26d668 100644
--- a/packages/compiler-core/__tests__/transforms/vSlot.spec.ts
+++ b/packages/compiler-core/__tests__/transforms/vSlot.spec.ts
@@ -771,6 +771,13 @@ describe('compiler: transform component slots', () => {
       const { slots } = parseWithSlots(`<Comp><slot v-for="a in b"/></Comp>`)
       expect(slots).toMatchObject(toMatch)
     })
+
+    test('<slot> tag w/ template', () => {
+      const { slots } = parseWithSlots(
+        `<Comp><template #default><slot/></template></Comp>`
+      )
+      expect(slots).toMatchObject(toMatch)
+    })
   })
 
   describe('errors', () => {
diff --git a/packages/compiler-core/src/transforms/vSlot.ts b/packages/compiler-core/src/transforms/vSlot.ts
index 327bac44..1e784c82 100644
--- a/packages/compiler-core/src/transforms/vSlot.ts
+++ b/packages/compiler-core/src/transforms/vSlot.ts
@@ -384,7 +384,8 @@ function hasForwardedSlots(children: TemplateChildNode[]): boolean {
       case NodeTypes.ELEMENT:
         if (
           child.tagType === ElementTypes.SLOT ||
-          (child.tagType === ElementTypes.ELEMENT &&
+          ((child.tagType === ElementTypes.ELEMENT ||
+            child.tagType === ElementTypes.TEMPLATE) &&
             hasForwardedSlots(child.children))
         ) {
           return true