wip: make computed implementation consistent

packages/runtime-core/src/apiReactivity.ts

@@ -23,11 +23,11 @@ export {
 import {
   computed as _computed,
   ComputedRef,
+  ComputedOptions,
   ReactiveEffect
 } from '@vue/reactivity'
 
 import { currentInstance } from './component'
-import { isFunction } from '@vue/shared'
 
 // record effects created during a component's setup() so that they can be
 // stopped when the component unmounts
@@ -37,20 +37,10 @@ export function recordEffect(effect: ReactiveEffect) {
   }
 }
 
-interface ComputedOptions<T> {
-  get: () => T
-  set: (v: T) => void
-}
-
 export function computed<T>(
   getterOrOptions: (() => T) | ComputedOptions<T>
 ): ComputedRef<T> {
-  let c: ComputedRef<T>
-  if (isFunction(getterOrOptions)) {
-    c = _computed(getterOrOptions)
-  } else {
-    c = _computed(getterOrOptions.get, getterOrOptions.set)
-  }
+  const c = _computed(getterOrOptions)
   recordEffect(c.effect)
   return c
 }