From 32a9024938382f400c070ddc6e899ee37b74d4b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9A=D0=B8=D1=80=D0=B8=D0=BB=D0=BB=20=D0=92=D0=B5=D1=82?=
 =?UTF-8?q?=D1=80=D0=BE=D0=B2?= <vetrovk@gmail.com>
Date: Thu, 25 Jun 2026 14:11:19 +0300
Subject: [PATCH] fix: harden generate image mode validation

---
 src/core/operations/GenerateImage.mjs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/core/operations/GenerateImage.mjs b/src/core/operations/GenerateImage.mjs
index 56b5798a..c276213d 100644
--- a/src/core/operations/GenerateImage.mjs
+++ b/src/core/operations/GenerateImage.mjs
@@ -74,12 +74,12 @@ class GenerateImage extends Operation {
             Bits: 1 / 8,
         };
 
-        const bytesPerPixel = bytePerPixelMap[mode];
-
-        if (bytesPerPixel === undefined) {
+        if (!Object.hasOwn(bytePerPixelMap, mode)) {
             throw new OperationError(`Unsupported Mode: (${mode})`);
         }
 
+        const bytesPerPixel = bytePerPixelMap[mode];
+
         if (bytesPerPixel > 0 && input.length % bytesPerPixel !== 0) {
             throw new OperationError(
                 `Number of bytes is not a divisor of ${bytesPerPixel}`,