chore: improve code

Author: edison1105

packages/server-renderer/__tests__/ssrSlot.spec.ts

@@ -145,12 +145,12 @@ describe('ssr: slot', () => {
         createApp({
           components: {
             one: {
-              template: `<transition><slot/></transition>`,
+              template: `<TransitionGroup tag="div"><slot/></TransitionGroup>`,
             },
           },
           template: `<one><p v-for="i in 2">{{i}}</p></one>`,
         }),
       ),
-    ).toBe(`<p>1</p><p>2</p>`)
+    ).toBe(`<div><p>1</p><p>2</p></div>`)
   })
 })

packages/server-renderer/src/helpers/ssrRenderSlot.ts

@@ -83,18 +83,16 @@ export function ssrRenderSlotInner(
         }
       } else {
         for (let i = 0; i < slotBuffer.length; i++) {
+          const buffer = slotBuffer[i]
           // #9933
           // Although we handle Transition/TransitionGroup in the transform stage
-          // without rendering them as fragments, the content passed into the slot
+          // without rendering it as a fragment, the content passed into the slot
           // may still be a fragment.
           // Therefore, here we need to avoid rendering it as a fragment again.
-          if (
-            transition &&
-            (slotBuffer[i] === '<!--[-->' || slotBuffer[i] === '<!--]-->')
-          ) {
+          if (transition && (buffer === '<!--[-->' || buffer === '<!--]-->')) {
             continue
           }
-          push(slotBuffer[i])
+          push(buffer)
         }
       }
     }