fix(schema): show `payloadExtraction` warning only when unset (#18516)

Co-authored-by: Daniel Roe <daniel@roe.dev>

packages/nuxi/src/commands/build.ts

@@ -27,11 +27,6 @@ export default defineNuxtCommand({
         cwd: rootDir,
         fileName: args.dotenv
       },
-      defaults: {
-        experimental: {
-          payloadExtraction: args.prerender ? true : undefined
-        }
-      },
       overrides: {
         logLevel: args['log-level'],
         _generate: args.prerender

packages/nuxt/src/core/nuxt.ts

@@ -243,6 +243,10 @@ async function initNuxt (nuxt: Nuxt) {
   }
 
   // Add prerender payload support
+  if (nuxt.options._generate && nuxt.options.experimental.payloadExtraction === undefined) {
+    console.warn('Using experimental payload extraction for full-static output. You can opt-out by setting `experimental.payloadExtraction` to `false`.')
+    nuxt.options.experimental.payloadExtraction = true
+  }
   if (!nuxt.options.dev && nuxt.options.experimental.payloadExtraction) {
     addPlugin(resolve(nuxt.options.appDir, 'plugins/payload.client'))
   }

packages/schema/src/config/experimental.ts

@@ -117,15 +117,7 @@ export default defineUntypedSchema({
     /**
      * When this option is enabled (by default) payload of pages generated with `nuxt generate` are extracted
      */
-    payloadExtraction: {
-      async $resolve(enabled, get) {
-        enabled = enabled ?? false
-        if (enabled) {
-          console.warn('Using experimental payload extraction for full-static output. You can opt-out by setting `experimental.payloadExtraction` to `false`.')
-        }
-        return enabled
-      }
-    },
+    payloadExtraction: undefined,
 
     /**
      * Whether to enable the experimental `<NuxtClientFallback>` component for rendering content on the client