From e21f68140c13c294a1a5a1bd4641e6c0bf3d1066 Mon Sep 17 00:00:00 2001
From: xjccc <546534045@qq.com>
Date: Mon, 15 Jul 2024 23:26:30 +0800
Subject: [PATCH] fix(nuxt): only warn when `useAsyncData` returns undefined
 (#28154)

---
 packages/nuxt/src/app/composables/asyncData.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/nuxt/src/app/composables/asyncData.ts b/packages/nuxt/src/app/composables/asyncData.ts
index 2a68ac0932..80ad7c4756 100644
--- a/packages/nuxt/src/app/composables/asyncData.ts
+++ b/packages/nuxt/src/app/composables/asyncData.ts
@@ -253,16 +253,16 @@ export function useAsyncData<
   }
 
   // TODO: make more precise when v4 lands
-  const hasCachedData = () => options.getCachedData!(key, nuxtApp) != null
+  const hasCachedData = () => options.getCachedData!(key, nuxtApp) !== undefined
 
   // Create or use a shared asyncData entity
   if (!nuxtApp._asyncData[key] || !options.immediate) {
     nuxtApp.payload._errors[key] ??= asyncDataDefaults.errorValue
 
     const _ref = options.deep ? ref : shallowRef
-
+    const cachedData = options.getCachedData!(key, nuxtApp)
     nuxtApp._asyncData[key] = {
-      data: _ref(options.getCachedData!(key, nuxtApp) ?? options.default!()),
+      data: _ref(typeof cachedData !== 'undefined' ? cachedData : options.default!()),
       pending: ref(!hasCachedData()),
       error: toRef(nuxtApp.payload._errors, key),
       status: ref('idle'),
@@ -311,9 +311,9 @@ export function useAsyncData<
           result = pick(result as any, options.pick) as DataT
         }
 
-        if (import.meta.dev && import.meta.server && !result) {
+        if (import.meta.dev && import.meta.server && typeof result === 'undefined') {
           // @ts-expect-error private property
-          console.warn(`[nuxt] \`${options._functionName || 'useAsyncData'}\` must return a truthy value (for example, it should not be \`undefined\`, \`null\` or empty string) or the request may be duplicated on the client side.`)
+          console.warn(`[nuxt] \`${options._functionName || 'useAsyncData'}\` must return a value (it should not be \`undefined\`) or the request may be duplicated on the client side.`)
         }
 
         nuxtApp.payload.data[key] = result