feat(ssr): renderToStream (#1197)

packages/server-renderer/src/helpers/ssrRenderComponent.ts

@@ -0,0 +1,15 @@
+import { Component, ComponentInternalInstance, createVNode, Slots } from 'vue'
+import { Props, renderComponentVNode, SSRBuffer } from '../render'
+import { SSRSlots } from './ssrRenderSlot'
+
+export function ssrRenderComponent(
+  comp: Component,
+  props: Props | null = null,
+  children: Slots | SSRSlots | null = null,
+  parentComponent: ComponentInternalInstance | null = null
+): SSRBuffer | Promise<SSRBuffer> {
+  return renderComponentVNode(
+    createVNode(comp, props, children),
+    parentComponent
+  )
+}