From eabedab38ec27e519d34aa0d5adf5cf8ac6cec36 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 6 Oct 2019 14:07:53 +0200
Subject: [PATCH] [MessageHandler] Add a non-PRODUCTION/TESTING check to ensure
 that `wrapReason` is called with a valid `reason`

There shouldn't be any situation where `reason` isn't either an `Error`, or a cloned "Error" sent via `postMessage`.
---
 src/shared/message_handler.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/shared/message_handler.js b/src/shared/message_handler.js
index 451152dd2..2a3178255 100644
--- a/src/shared/message_handler.js
+++ b/src/shared/message_handler.js
@@ -31,7 +31,13 @@ const StreamKind = {
 };
 
 function wrapReason(reason) {
-  if (typeof reason !== 'object') {
+  if (typeof PDFJSDev === 'undefined' ||
+      PDFJSDev.test('!PRODUCTION || TESTING')) {
+    assert(reason instanceof Error ||
+           (typeof reason === 'object' && reason !== null),
+           'wrapReason: Expected "reason" to be a (possibly cloned) Error.');
+  }
+  if (typeof reason !== 'object' || reason === null) {
     return reason;
   }
   switch (reason.name) {