chore: update

Author: yangchangtao

packages/runtime-core/src/scheduler.ts

@@ -63,13 +63,14 @@ export function nextTick<T = void, R = void>(
   const p = currentFlushPromise || resolvedPromise
   let wrapperFn: ((this: T) => R | Promise<R> | undefined) | undefined = fn
   if (!currentFlushPromise) {
-    wrapperFn = function () {
-      if (!fn) return
-      if (currentFlushPromise) {
-        return currentFlushPromise.then(fn.bind(this))
-      }
-      return fn.call(this)
-    }
+    wrapperFn = fn
+      ? function () {
+          if (currentFlushPromise) {
+            return currentFlushPromise.then(fn.bind(this))
+          }
+          return fn.call(this)
+        }
+      : void 0
   }
   return wrapperFn ? p.then(this ? wrapperFn.bind(this) : wrapperFn) : p
 }