fix(ssr): watchEffect onInvalidate runner initialization (#3323)

close #3322

packages/server-renderer/__tests__/render.spec.ts

@@ -8,9 +8,10 @@ import {
   defineComponent,
   createTextVNode,
   createStaticVNode,
-  KeepAlive,
   withCtx,
-  Transition
+  KeepAlive,
+  Transition,
+  watchEffect
 } from 'vue'
 import { escapeHtml } from '@vue/shared'
 import { renderToString } from '../src/renderToString'
@@ -775,5 +776,15 @@ function testRender(type: string, render: typeof renderToString) {
       const html = await render(app)
       expect(html).toBe(`<div>hello</div>`)
     })
+
+    // https://github.com/vuejs/vue-next/issues/3322
+    test('effect onInvalidate does not error', async () => {
+      const noop = () => {}
+      const app = createApp({
+        setup: () => watchEffect(onInvalidate => onInvalidate(noop)),
+        render: noop,
+      })
+      expect(await render(app)).toBe('<!---->')
+    })
   })
 }