From 0d581403c192da63fb1a459caf3bc0ab072694fb Mon Sep 17 00:00:00 2001
From: kkapsner <github@mail.kkapsner.de>
Date: Sat, 6 Mar 2021 11:08:55 +0100
Subject: [PATCH] toBlob is not a constructor

---
 lib/modifiedCanvasAPI.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/modifiedCanvasAPI.js b/lib/modifiedCanvasAPI.js
index 42797af..3dac897 100644
--- a/lib/modifiedCanvasAPI.js
+++ b/lib/modifiedCanvasAPI.js
@@ -359,6 +359,11 @@
 			object: "HTMLCanvasElement",
 			fakeGenerator: function(checker){
 				return function toBlob(callback){
+					if (this instanceof toBlob){
+						throw new extension.getWrapped(window).TypeError(
+							"HTMLCanvasElement.prototype.toBlob is not a constructor"
+						);
+					}
 					return checkerWrapper(checker, this, arguments, useFakeCanvasCallback);
 				};
 			},