fix(ssr): make computed inactive during ssr, fix memory leak

fix #5208

packages/reactivity/src/computed.ts

@@ -36,7 +36,8 @@ class ComputedRefImpl<T> {
   constructor(
     getter: ComputedGetter<T>,
     private readonly _setter: ComputedSetter<T>,
-    isReadonly: boolean
+    isReadonly: boolean,
+    isSSR: boolean
   ) {
     this.effect = new ReactiveEffect(getter, () => {
       if (!this._dirty) {
@@ -44,6 +45,7 @@ class ComputedRefImpl<T> {
         triggerRefValue(this)
       }
     })
+    this.effect.active = !isSSR
     this[ReactiveFlags.IS_READONLY] = isReadonly
   }
 
@@ -73,7 +75,8 @@ export function computed<T>(
 ): WritableComputedRef<T>
 export function computed<T>(
   getterOrOptions: ComputedGetter<T> | WritableComputedOptions<T>,
-  debugOptions?: DebuggerOptions
+  debugOptions?: DebuggerOptions,
+  isSSR = false
 ) {
   let getter: ComputedGetter<T>
   let setter: ComputedSetter<T>
@@ -91,9 +94,9 @@ export function computed<T>(
     setter = getterOrOptions.set
   }
 
-  const cRef = new ComputedRefImpl(getter, setter, onlyGetter || !setter)
+  const cRef = new ComputedRefImpl(getter, setter, onlyGetter || !setter, isSSR)
 
-  if (__DEV__ && debugOptions) {
+  if (__DEV__ && debugOptions && !isSSR) {
     cRef.effect.onTrack = debugOptions.onTrack
     cRef.effect.onTrigger = debugOptions.onTrigger
   }