⚡ Bolt: [성능 개선]

.jules/bolt.md

@@ -61,3 +61,4 @@
 ## 2026-07-13 - Array.from mapping optimization
 **Learning:** Using `Array.from({ length: N }).map(...)` creates an intermediate array of `undefined` values which requires memory allocation and garbage collection, adding O(N) unnecessary overhead in frequently re-rendered UI components.
 **Action:** Use `Array.from({ length: N }, (_, index) => ...)` to map elements directly during array creation, avoiding intermediate allocations.
+## 2026-11-23 - Avoid .every() for large array validation\n**Learning:** Using `Array.prototype.every()` for validating large byte arrays allocates an intermediate callback function repeatedly in a hot path, causing O(N) allocation overhead.\n**Action:** Use a standard `for` loop with an early `break` to keep memory usage at O(1) and improve execution speed.

apps/desktop/src/features/score/scoreStorage.test.ts

@@ -16,6 +16,15 @@ describe("scoreStorage bridge resolution", () => {
     delete tauriWindow.__TAURI_INVOKE__;
   });
 
+  it("fails closed when readScorePdf receives an invalid array (early exit for non-number)", async () => {
+    const tauriWindow = window as TauriWindow;
+    tauriWindow.__TAURI_INVOKE__ = vi.fn().mockResolvedValue([1, 2, "not-a-number", 4]);
+
+    await expect(readScorePdf("project-1", "score-1")).rejects.toThrow(
+      "Invalid score bridge response"
+    );
+  });
+
   it("fails closed on every command when there is no window (non-browser runtime)", async () => {
     // Simulate a runtime without a DOM window (e.g. SSR / bundler prerender):
     // getInvoke() must take the `typeof window === "undefined"` branch and

apps/desktop/src/features/score/scoreStorage.ts

@@ -91,8 +91,18 @@ export async function readScorePdf(projectId: string, scoreId: string): Promise<
   if (response instanceof ArrayBuffer) {
     return new Uint8Array(response);
   }
-  if (Array.isArray(response) && response.every((byte) => typeof byte === "number")) {
-    return Uint8Array.from(response as number[]);
+  if (Array.isArray(response)) {
+    // Performance: Avoid O(N) callback invocation overhead from .every()
+    let isDense = true;
+    for (let i = 0; i < response.length; i++) {
+      if (typeof response[i] !== "number") {
+        isDense = false;
+        break;
+      }
+    }
+    if (isDense) {
+      return Uint8Array.from(response as number[]);
+    }
   }
 
   throw new Error(INVALID_RESPONSE_MESSAGE);