wip: watcher callback handling inside suspense

packages/runtime-core/src/apiLifecycle.ts

@@ -39,7 +39,11 @@ function injectHook(
     warn(
       `${apiName} is called when there is no active component instance to be ` +
         `associated with. ` +
-        `Lifecycle injection APIs can only be used during execution of setup().`
+        `Lifecycle injection APIs can only be used during execution of setup().` +
+        (__FEATURE_SUSPENSE__
+          ? ` If you are using async setup(), make sure to register lifecycle ` +
+            `hooks before the first await statement.`
+          : ``)
     )
   }
 }