From 4afce6114b347ce57e95f59dc67f6483b249a383 Mon Sep 17 00:00:00 2001
From: gwansikk <gwansik.kim@gwansik.dev>
Date: Thu, 8 Jan 2026 07:55:04 +0900
Subject: [PATCH 1/4] perf(store): improve batch flush performance for large
 forms

---
 packages/store/src/scheduler.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/store/src/scheduler.ts b/packages/store/src/scheduler.ts
index da36dda..89f6ebb 100644
--- a/packages/store/src/scheduler.ts
+++ b/packages/store/src/scheduler.ts
@@ -26,7 +26,7 @@ export const __derivedToStore = new WeakMap<
 >()
 
 export const __depsThatHaveWrittenThisTick = {
-  current: [] as Array<Derived<unknown> | Store<unknown>>,
+  current: new Set<Derived<unknown> | Store<unknown>>(),
 }
 
 let __isFlushing = false
@@ -37,11 +37,11 @@ const __initialBatchValues = new Map<Store<unknown>, unknown>()
 
 function __flush_internals(relatedVals: ReadonlyArray<Derived<unknown>>) {
   for (const derived of relatedVals) {
-    if (__depsThatHaveWrittenThisTick.current.includes(derived)) {
+    if (__depsThatHaveWrittenThisTick.current.has(derived)) {
       continue
     }
 
-    __depsThatHaveWrittenThisTick.current.push(derived)
+    __depsThatHaveWrittenThisTick.current.add(derived)
     derived.recompute()
 
     const stores = __derivedToStore.get(derived)
@@ -109,7 +109,7 @@ export function __flush(store: Store<unknown>) {
         const derivedVals = __storeToDerived.get(store)
         if (!derivedVals) continue
 
-        __depsThatHaveWrittenThisTick.current.push(store)
+        __depsThatHaveWrittenThisTick.current.add(store)
         __flush_internals(derivedVals)
       }
 
@@ -125,7 +125,7 @@ export function __flush(store: Store<unknown>) {
     }
   } finally {
     __isFlushing = false
-    __depsThatHaveWrittenThisTick.current = []
+    __depsThatHaveWrittenThisTick.current.clear()
     __initialBatchValues.clear()
   }
 }

From 7efb1566f15482a2815ca2f3fd828c23ec6aeab5 Mon Sep 17 00:00:00 2001
From: gwansikk <gwansik.kim@gwansik.dev>
Date: Thu, 8 Jan 2026 23:13:19 +0900
Subject: [PATCH 2/4] docs: update type definition for
 `__depsThatHaveWrittenThisTick`

---
 docs/reference/variables/depsThatHaveWrittenThisTick.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/reference/variables/depsThatHaveWrittenThisTick.md b/docs/reference/variables/depsThatHaveWrittenThisTick.md
index c48d0df..f5c6d57 100644
--- a/docs/reference/variables/depsThatHaveWrittenThisTick.md
+++ b/docs/reference/variables/depsThatHaveWrittenThisTick.md
@@ -18,5 +18,5 @@ Defined in: [scheduler.ts:28](https://github.com/TanStack/store/blob/main/packag
 ```ts
 current: (
   | Derived<unknown, readonly any[]>
-  | Store<unknown, (cb) => unknown>)[];
+  | Set<Store<unknown, (cb: unknown) => unknown>)[];
 ```

From 5f9ee84cf11cb34f1a3c9dfa4768397b8f502583 Mon Sep 17 00:00:00 2001
From: gwansikk <gwansik.kim@gwansik.dev>
Date: Thu, 8 Jan 2026 23:33:55 +0900
Subject: [PATCH 3/4] chore: add changeset

---
 .changeset/orange-carrots-listen.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/orange-carrots-listen.md

diff --git a/.changeset/orange-carrots-listen.md b/.changeset/orange-carrots-listen.md
new file mode 100644
index 0000000..3dbfea0
--- /dev/null
+++ b/.changeset/orange-carrots-listen.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/store': minor
+---
+
+refactor(store): replace array with set in \_\_depsThatHaveWrittenThisTick

From 610fa0aadf07ca7bcf31ef381c338737e26969d0 Mon Sep 17 00:00:00 2001
From: Gwansik Kim <gwansik.kim@gwansik.dev>
Date: Thu, 8 Jan 2026 23:35:12 +0900
Subject: [PATCH 4/4] Apply suggestion from @gwansikk

---
 .changeset/orange-carrots-listen.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.changeset/orange-carrots-listen.md b/.changeset/orange-carrots-listen.md
index 3dbfea0..20f3f92 100644
--- a/.changeset/orange-carrots-listen.md
+++ b/.changeset/orange-carrots-listen.md
@@ -1,5 +1,5 @@
 ---
-'@tanstack/store': minor
+'@tanstack/store': patch
 ---
 
 refactor(store): replace array with set in \_\_depsThatHaveWrittenThisTick