feat(add): api computed

packages/runtime-core/src/apiComputed.ts

@@ -0,0 +1,20 @@
+import {
+  computed as _computed,
+  ComputedGetter,
+  ComputedRef,
+  WritableComputedOptions,
+  WritableComputedRef
+} from '@vue/reactivity'
+import { recordInstanceBoundEffect } from './component'
+
+export function computed<T>(getter: ComputedGetter<T>): ComputedRef<T>
+export function computed<T>(
+  options: WritableComputedOptions<T>
+): WritableComputedRef<T>
+export function computed<T>(
+  getterOrOptions: ComputedGetter<T> | WritableComputedOptions<T>
+) {
+  const c = _computed(getterOrOptions as any)
+  recordInstanceBoundEffect(c.effect)
+  return c
+}

packages/runtime-core/src/index.ts

@@ -35,6 +35,7 @@ export {
   flushPostFlushCbs,
   invalidateJob
 } from './scheduler'
+export { provide, inject } from './apiInject'
 export { defineComponent } from './apiDefineComponent'
 
 // Advanced API ----------------------------------------------------------------