From dc4eb997d49befa16054fa3b1565ec7a79cedb21 Mon Sep 17 00:00:00 2001
From: Christopher Bisom <cbisom@flexion.us>
Date: Mon, 18 Nov 2024 15:24:54 -0500
Subject: [PATCH 1/2] conditionally load pdfjs legacy build

---
 web-client/src/applicationContext.ts | 44 ++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/web-client/src/applicationContext.ts b/web-client/src/applicationContext.ts
index a9cf426f7de..fc114a43ab4 100644
--- a/web-client/src/applicationContext.ts
+++ b/web-client/src/applicationContext.ts
@@ -362,6 +362,34 @@ const reduce = ImageBlobReduce({
 
 let user;
 let broadcastChannel;
+const clientSupportsES2022 = (() => {
+  try {
+    // Check Object.hasOwn (introduced in ES2022)
+    // @ts-ignore
+    if (typeof Object.hasOwn !== 'function') {
+      return false;
+    }
+
+    // Check private fields
+    class TestPrivateFields {
+      #privateField: boolean;
+      constructor() {
+        this.#privateField = true;
+      }
+      hasPrivateField() {
+        return this.#privateField;
+      }
+    }
+    const instance = new TestPrivateFields();
+    if (!instance.hasPrivateField()) {
+      return false;
+    }
+
+    return true;
+  } catch (e) {
+    return false; // Any failure indicates lack of support
+  }
+})();
 
 let forceRefreshCallback: () => {};
 
@@ -669,9 +697,19 @@ const applicationContext = {
     },
   }),
   getPdfJs: async () => {
-    const pdfjsLib = (await import('pdfjs-dist')).default;
-    const pdfjsWorker = (await import('pdfjs-dist/build/pdf.worker.entry'))
-      .default;
+    const pdfjsLib = (
+      await import(
+        clientSupportsES2022 ? 'pdfjs-dist' : 'pdfjs-dist/legacy/build/pdf'
+      )
+    ).default;
+    const pdfjsWorker = (
+      await import(
+        clientSupportsES2022
+          ? 'pdfjs-dist/build/pdf.worker.entry'
+          : 'pdfjs-dist/legacy/build/pdf.worker.entry'
+      )
+    ).default;
+
     pdfjsLib.GlobalWorkerOptions.workerSrc = pdfjsWorker;
     return pdfjsLib;
   },

From e435a56499f29584d7cbeb36d6dd4b994661e580 Mon Sep 17 00:00:00 2001
From: Christopher Bisom <cbisom@flexion.us>
Date: Thu, 21 Nov 2024 11:32:24 -0500
Subject: [PATCH 2/2] load-legacy-pdfjs-conditionally: add another feature in
 the feature check list

---
 web-client/src/applicationContext.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/web-client/src/applicationContext.ts b/web-client/src/applicationContext.ts
index fc114a43ab4..905ee493393 100644
--- a/web-client/src/applicationContext.ts
+++ b/web-client/src/applicationContext.ts
@@ -370,6 +370,11 @@ const clientSupportsES2022 = (() => {
       return false;
     }
 
+    // Check Array.prototype.at
+    if (!Array.prototype.at) {
+      return false;
+    }
+
     // Check private fields
     class TestPrivateFields {
       #privateField: boolean;