refactor: remove link pool

Author: johnsoncodehk

packages/reactivity/src/system.ts

@@ -35,7 +35,6 @@ export const enum SubscriberFlags {
 let batchDepth = 0
 let queuedEffects: Effect | undefined
 let queuedEffectsTail: Effect | undefined
-let linkPool: Link | undefined
 
 export function startBatch(): void {
   ++batchDepth
@@ -238,22 +237,12 @@ function linkNewDep(
   nextDep: Link | undefined,
   depsTail: Link | undefined,
 ): Link {
-  let newLink: Link
-
-  if (linkPool !== undefined) {
-    newLink = linkPool
-    linkPool = newLink.nextDep
-    newLink.nextDep = nextDep
-    newLink.dep = dep
-    newLink.sub = sub
-  } else {
-    newLink = {
-      dep,
-      sub,
-      nextDep,
-      prevSub: undefined,
-      nextSub: undefined,
-    }
+  const newLink: Link = {
+    dep,
+    sub,
+    nextDep,
+    prevSub: undefined,
+    nextSub: undefined,
   }
 
   if (depsTail === undefined) {
@@ -400,25 +389,16 @@ function clearTracking(link: Link): void {
 
     if (nextSub !== undefined) {
       nextSub.prevSub = prevSub
-      link.nextSub = undefined
     } else {
       dep.subsTail = prevSub
     }
 
     if (prevSub !== undefined) {
       prevSub.nextSub = nextSub
-      link.prevSub = undefined
     } else {
       dep.subs = nextSub
     }
 
-    // @ts-expect-error
-    link.dep = undefined
-    // @ts-expect-error
-    link.sub = undefined
-    link.nextDep = linkPool
-    linkPool = link
-
     if (dep.subs === undefined && 'deps' in dep) {
       const depFlags = dep.flags
       if (!(depFlags & SubscriberFlags.Dirty)) {