From 9e24a1660e4a1816c159f806e18ab169a3792852 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Wed, 8 Jun 2022 22:10:59 +0200
Subject: [PATCH] Polyfill `Array.prototype.at` with core-js (PR 14976
 follow-up)

This Array-method is a fairly new addition to the ECMAScript specification, hence we need a polyfill to avoid the library/viewer breaking in older browsers.

Please find additional information at:
 - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at
 - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at#browser_compatibility
---
 src/shared/compatibility.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index 79385f2a80749..4bd1f4885dac2 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -80,6 +80,14 @@ if (
     ).ReadableStream;
   })();
 
+  // Support: Firefox<90, Chrome<92, Safari<15.4, Node.js<16.6.0
+  (function checkArrayAt() {
+    if (Array.prototype.at) {
+      return;
+    }
+    require("core-js/es/array/at.js");
+  })();
+
   // Support: Firefox<94, Chrome<98, Safari<15.4, Node.js<17.0.0
   (function checkStructuredClone() {
     if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {