refactor(reactivity): make some expression simpler (#5131)

packages/runtime-core/src/renderer.ts

@@ -1544,11 +1544,11 @@ function baseCreateRenderer(
     // create reactive effect for rendering
     const effect = (instance.effect = new ReactiveEffect(
       componentUpdateFn,
-      () => queueJob(instance.update),
+      () => queueJob(update),
       instance.scope // track it in component's effect scope
     ))
 
-    const update = (instance.update = effect.run.bind(effect) as SchedulerJob)
+    const update: SchedulerJob = (instance.update = () => effect.run())
     update.id = instance.uid
     // allowRecurse
     // #1801, #2043 component render effects should allow recursive updates
@@ -1561,7 +1561,6 @@ function baseCreateRenderer(
       effect.onTrigger = instance.rtg
         ? e => invokeArrayFns(instance.rtg!, e)
         : void 0
-      // @ts-ignore (for scheduler)
       update.ownerInstance = instance
     }