From 47a9d38280fc54d156c77ad89e7ac1b2b4bcc4ec Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 5 Jun 2018 20:29:42 +0200
Subject: [PATCH] Add more validation in `PDFWorker.fromPort`

The signature of the `PDFWorker.fromPort` method, in addition to the `PDFWorker` constructor, was changed in PR 9480.
Hence it's probably a good idea to add a bit more validation to `PDFWorker.fromPort`, to ensure that it won't fail silently for an API consumer that updates to version 2.0 of the PDF.js library.
---
 src/display/api.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/display/api.js b/src/display/api.js
index 92b842eba..cce2704b0 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -1593,6 +1593,9 @@ var PDFWorker = (function PDFWorkerClosure() {
    * @param {PDFWorkerParameters} params - The worker initialization parameters.
    */
   PDFWorker.fromPort = function(params) {
+    if (!params || !params.port) {
+      throw new Error('PDFWorker.fromPort - invalid method signature.');
+    }
     if (pdfWorkerPorts.has(params.port)) {
       return pdfWorkerPorts.get(params.port);
     }