From 95b456faf75569c3a04cdee7d90b97e6c685d480 Mon Sep 17 00:00:00 2001
From: MarkLo <yao920127@gmail.com>
Date: Sat, 20 Dec 2025 08:00:14 +0800
Subject: [PATCH] fix: TypeScript error in PriceChart Tooltip formatter

---
 frontend/components/analysis/PriceChart.tsx | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/frontend/components/analysis/PriceChart.tsx b/frontend/components/analysis/PriceChart.tsx
index 6829915c..3b347a5b 100644
--- a/frontend/components/analysis/PriceChart.tsx
+++ b/frontend/components/analysis/PriceChart.tsx
@@ -154,7 +154,10 @@ export function PriceChart({ priceData, priceStats, ticker }: PriceChartProps) {
                   tickFormatter={(value) => `$${value.toFixed(0)}`}
                 />
                 <Tooltip 
-                  formatter={(value: number) => [`$${formatNumber(value)}`, '收盤價']}
+                  formatter={(value: number | undefined) => [
+                    value !== undefined ? `$${formatNumber(value)}` : '-', 
+                    '收盤價'
+                  ]}
                   labelFormatter={(label) => `日期: ${label}`}
                 />
                 <Line 
@@ -242,7 +245,10 @@ export function PriceChart({ priceData, priceStats, ticker }: PriceChartProps) {
                 }}
               />
               <Tooltip 
-                formatter={(value: number) => [value.toLocaleString(), '交易量']}
+                formatter={(value: number | undefined) => [
+                  value !== undefined ? value.toLocaleString() : '-', 
+                  '交易量'
+                ]}
                 labelFormatter={(label) => `日期: ${label}`}
               />
               <Bar dataKey="Volume" fill="#93c5fd" name="交易量" />