From 9bd174cc56d25e9073210ac2a0d4bcda263e602f Mon Sep 17 00:00:00 2001
From: HIsheR <shawn1440982358@163.com>
Date: Fri, 16 Oct 2026 15:43:23 +0800
Subject: [PATCH] =?UTF-8?q?feat(stock-count):=20=E6=96=B0=E5=A2=9E?=
 =?UTF-8?q?=E7=9B=A4=E9=BB=9E=E5=B7=AE=E7=95=B0=E8=A8=88=E7=AE=97?=
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提供帳面與實盤差異的計算邏輯
---
 src/modules/stock-count.ts | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/modules/stock-count.ts

diff --git a/src/modules/stock-count.ts b/src/modules/stock-count.ts
new file mode 100644
index 0000000..a5f7444
--- /dev/null
+++ b/src/modules/stock-count.ts
@@ -0,0 +1,20 @@
+/**
+ * 盤點差異模組（沙盤推演示意）
+ */
+
+/** 單一物料的盤點差異 */
+export interface StockCountDiff {
+  /** 物料識別碼 */
+  materialId: string;
+  /** 帳面數量 */
+  bookQty: number;
+  /** 實盤數量 */
+  countedQty: number;
+}
+
+/**
+ * 計算盤點差異數量
+ * @param diff - 單一物料的盤點資料
+ * @returns 實盤減帳面的差異值
+ */
+export const diffQty = (diff: StockCountDiff): number => diff.countedQty - diff.bookQty;