fix(reactivity): rely on dirty check only when computed has deps (vuejs#11931)

close vuejs#11929

Author: jh-leong

packages/reactivity/__tests__/computed.spec.ts

@@ -23,6 +23,7 @@ import {
   ref,
   shallowRef,
   toRaw,
+  triggerRef,
 } from '../src'
 import { EffectFlags, pauseTracking, resetTracking } from '../src/effect'
 import type { ComputedRef, ComputedRefImpl } from '../src/computed'
@@ -1004,4 +1005,10 @@ describe('reactivity/computed', () => {
     await nextTick()
     expect(serializeInner(root)).toBe(`<button>Step</button><p>Step 2</p>`)
   })
+
+  it('manual trigger computed', () => {
+    const cValue = computed(() => 1)
+    triggerRef(cValue)
+    expect(cValue.value).toBe(1)
+  })
 })

packages/reactivity/src/effect.ts

@@ -352,7 +352,12 @@ export function refreshComputed(computed: ComputedRefImpl): undefined {
   // and therefore tracks no deps, thus we cannot rely on the dirty check.
   // Instead, computed always re-evaluate and relies on the globalVersion
   // fast path above for caching.
-  if (dep.version > 0 && !computed.isSSR && !isDirty(computed)) {
+  if (
+    dep.version > 0 &&
+    !computed.isSSR &&
+    computed.deps &&
+    !isDirty(computed)
+  ) {
     computed.flags &= ~EffectFlags.RUNNING
     return
   }