chore: fix devServer

packages/client/src/setupUpdateHead.ts

@@ -29,9 +29,11 @@ export const setupUpdateHead = (): void => {
 
   // load current head tags from DOM
   const loadHead = (): void => {
-    managedHeadElements.push(
-      ...(head.value.map(queryHeadElement).filter(Boolean) as HTMLElement[]),
-    )
+    head.value.map(queryHeadElement).forEach((el) => {
+      if (el && managedHeadElements.every((head) => !head.isEqualNode(el))) {
+        managedHeadElements.push(el)
+      }
+    })
   }
 
   // update html lang attribute and head tags to DOM
@@ -53,11 +55,11 @@ export const setupUpdateHead = (): void => {
         (newEl) => newEl?.isEqualNode(el ?? null),
       )
 
-      if (matchedIndex !== -1) {
-        delete newHeadElements[matchedIndex]
-      } else {
+      if (matchedIndex === -1) {
         el?.remove()
         delete managedHeadElements[index]
+      } else {
+        delete newHeadElements[matchedIndex]
       }
     })
 
@@ -70,7 +72,14 @@ export const setupUpdateHead = (): void => {
 
   onMounted(() => {
     loadHead()
-    watch(() => head.value, updateHead)
+    if (__VUEPRESS_DEV__) updateHead()
+    watch(
+      () => head.value,
+      () => {
+        if (__VUEPRESS_DEV__) loadHead()
+        updateHead()
+      },
+    )
   })
 }