From ab6a2c1c501627ff23e1052a46c636b3aa8fd285 Mon Sep 17 00:00:00 2001
From: musistudio <m@musiiot.top>
Date: Thu, 9 Jul 2026 15:59:08 +0800
Subject: [PATCH] Fix USD cost formatting for large values

---
 packages/ui/src/pages/home/shared/usage.ts |  2 +-
 packages/ui/src/pages/tray/shared.tsx      |  2 +-
 tests/renderer/usage-format.test.ts        | 10 +++++++++-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/packages/ui/src/pages/home/shared/usage.ts b/packages/ui/src/pages/home/shared/usage.ts
index 040988d..ed29c9b 100644
--- a/packages/ui/src/pages/home/shared/usage.ts
+++ b/packages/ui/src/pages/home/shared/usage.ts
@@ -155,7 +155,7 @@ export function formatUsdCost(value: number | undefined): string {
   return new Intl.NumberFormat(undefined, {
     currency: "USD",
     maximumFractionDigits: normalized >= 100 ? 0 : 2,
-    minimumFractionDigits: 2,
+    minimumFractionDigits: normalized >= 100 ? 0 : 2,
     style: "currency"
   }).format(normalized);
 }
diff --git a/packages/ui/src/pages/tray/shared.tsx b/packages/ui/src/pages/tray/shared.tsx
index 1976d25..ef2cac4 100644
--- a/packages/ui/src/pages/tray/shared.tsx
+++ b/packages/ui/src/pages/tray/shared.tsx
@@ -609,7 +609,7 @@ export function formatUsdCost(value: number | undefined): string {
   return new Intl.NumberFormat(undefined, {
     currency: "USD",
     maximumFractionDigits: normalized >= 100 ? 0 : 2,
-    minimumFractionDigits: 2,
+    minimumFractionDigits: normalized >= 100 ? 0 : 2,
     style: "currency"
   }).format(normalized);
 }
diff --git a/tests/renderer/usage-format.test.ts b/tests/renderer/usage-format.test.ts
index 43eca8f..a6df6da 100644
--- a/tests/renderer/usage-format.test.ts
+++ b/tests/renderer/usage-format.test.ts
@@ -1,7 +1,8 @@
 import assert from "node:assert/strict";
 import test from "node:test";
 import { formatLogTokenSummary } from "../../packages/ui/src/pages/home/shared/logs.ts";
-import { formatCompactNumber } from "../../packages/ui/src/pages/home/shared/usage.ts";
+import { formatCompactNumber, formatUsdCost as formatHomeUsdCost } from "../../packages/ui/src/pages/home/shared/usage.ts";
+import { formatUsdCost as formatTrayUsdCost } from "../../packages/ui/src/pages/tray/shared.tsx";
 import type { RequestLogEntry } from "../../packages/core/src/contracts/app.ts";
 
 test("formatCompactNumber can be bound to the UI language locale", () => {
@@ -9,6 +10,13 @@ test("formatCompactNumber can be bound to the UI language locale", () => {
   assert.equal(formatCompactNumber(123456, "zh-CN"), "12.3万");
 });
 
+test("formatUsdCost formats large values without conflicting fraction digits", () => {
+  assert.doesNotThrow(() => formatHomeUsdCost(100));
+  assert.doesNotThrow(() => formatTrayUsdCost(100));
+  assert.doesNotMatch(formatHomeUsdCost(123.45), /[.,]45/);
+  assert.doesNotMatch(formatTrayUsdCost(123.45), /[.,]45/);
+});
+
 test("formatLogTokenSummary uses the provided locale for token counts", () => {
   const entry: RequestLogEntry = {
     cacheReadTokens: 0,