refactor(runtime-core): revert setup() result reactive conversion

BREAKING CHANGE: revert setup() result reactive conversion

    Revert 6b10f0c & a840e7d. The motivation of the original change was
    avoiding unnecessary deep conversions, but that can be achieved by
    explicitly marking values non-reactive via `markNonReactive`.

    Removing the reactive conversion behavior leads to an usability
    issue in that plain objects containing refs (which is what most
    composition functions will return), when exposed as a nested
    property from `setup()`, will not unwrap the refs in templates. This
    goes against the "no .value in template" intuition and the only
    workaround requires users to manually wrap it again with `reactive()`.

    So in this commit we are reverting to the previous behavior where
    objects returned from `setup()` are implicitly wrapped with
    `reactive()` for deep ref unwrapping.

packages/runtime-core/src/component.ts

@@ -1,5 +1,6 @@
 import { VNode, VNodeChild, isVNode } from './vnode'
 import {
+  reactive,
   ReactiveEffect,
   shallowReadonly,
   pauseTracking,
@@ -398,7 +399,7 @@ export function handleSetupResult(
     }
     // setup returned bindings.
     // assuming a render function compiled from template is present.
-    instance.renderContext = setupResult
+    instance.renderContext = reactive(setupResult)
   } else if (__DEV__ && setupResult !== undefined) {
     warn(
       `setup() should return an object. Received: ${
@@ -474,10 +475,6 @@ function finishComponentSetup(
     currentInstance = null
     currentSuspense = null
   }
-
-  if (instance.renderContext === EMPTY_OBJ) {
-    instance.renderContext = {}
-  }
 }
 
 // used to identify a setup context proxy

packages/runtime-core/src/componentProxy.ts

@@ -8,14 +8,7 @@ import {
   ComputedOptions,
   MethodOptions
 } from './apiOptions'
-import {
-  ReactiveEffect,
-  isRef,
-  isReactive,
-  Ref,
-  ComputedRef,
-  unref
-} from '@vue/reactivity'
+import { ReactiveEffect, UnwrapRef } from '@vue/reactivity'
 import { warn } from './warning'
 import { Slots } from './componentSlots'
 import {
@@ -48,17 +41,11 @@ export type ComponentPublicInstance<
   $nextTick: typeof nextTick
   $watch: typeof instanceWatch
 } & P &
-  UnwrapSetupBindings<B> &
+  UnwrapRef<B> &
   D &
   ExtractComputedReturns<C> &
   M
 
-type UnwrapSetupBindings<B> = { [K in keyof B]: UnwrapBinding<B[K]> }
-
-type UnwrapBinding<B> = B extends ComputedRef<any>
-  ? B extends ComputedRef<infer V> ? V : B
-  : B extends Ref<infer V> ? V : B
-
 const publicPropertiesMap: Record<
   string,
   (i: ComponentInternalInstance) => any
@@ -115,7 +102,7 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
           case AccessTypes.DATA:
             return data[key]
           case AccessTypes.CONTEXT:
-            return unref(renderContext[key])
+            return renderContext[key]
           case AccessTypes.PROPS:
             return propsProxy![key]
           // default: just fallthrough
@@ -123,9 +110,9 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
       } else if (data !== EMPTY_OBJ && hasOwn(data, key)) {
         accessCache![key] = AccessTypes.DATA
         return data[key]
-      } else if (hasOwn(renderContext, key)) {
+      } else if (renderContext !== EMPTY_OBJ && hasOwn(renderContext, key)) {
         accessCache![key] = AccessTypes.CONTEXT
-        return unref(renderContext[key])
+        return renderContext[key]
       } else if (type.props != null) {
         // only cache other properties when instance has declared (this stable)
         // props
@@ -180,19 +167,7 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
     if (data !== EMPTY_OBJ && hasOwn(data, key)) {
       data[key] = value
     } else if (hasOwn(renderContext, key)) {
-      // context is already reactive (user returned reactive object from setup())
-      // just set directly
-      if (isReactive(renderContext)) {
       renderContext[key] = value
-      } else {
-        // handle potential ref set
-        const oldValue = renderContext[key]
-        if (isRef(oldValue) && !isRef(value)) {
-          oldValue.value = value
-        } else {
-          renderContext[key] = value
-        }
-      }
     } else if (key[0] === '$' && key.slice(1) in target) {
       __DEV__ &&
         warn(

test-dts/defineComponent.test-d.tsx

@@ -4,7 +4,6 @@ import {
   defineComponent,
   PropType,
   ref,
-  Ref,
   reactive,
   createApp
 } from './index'
@@ -65,15 +64,12 @@ describe('with object props', () => {
       // setup context
       return {
         c: ref(1),
-        d: reactive({
+        d: {
           e: ref('hi')
-        }),
+        },
         f: reactive({
           g: ref('hello' as GT)
-        }),
-        h: {
-          i: ref('hi')
-        }
+        })
       }
     },
     render() {
@@ -106,9 +102,6 @@ describe('with object props', () => {
       expectType<string>(this.d.e)
       expectType<GT>(this.f.g)
 
-      // should not unwrap refs nested under non-reactive objects
-      expectType<Ref<string>>(this.h.i)
-
       // setup context properties should be mutable
       this.c = 2