From 3e255fa6473cfdd84d51f3a9d77d265d24fb9b6e Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Mon, 29 Dec 2025 10:15:15 +0200
Subject: [PATCH] feat(client/pdf): add debouncing

---
 packages/pdfjs-viewer/src/custom.mjs | 29 +++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/packages/pdfjs-viewer/src/custom.mjs b/packages/pdfjs-viewer/src/custom.mjs
index 48d73e719..1f75add44 100644
--- a/packages/pdfjs-viewer/src/custom.mjs
+++ b/packages/pdfjs-viewer/src/custom.mjs
@@ -5,19 +5,30 @@ async function main() {
     }
 
     const app = PDFViewerApplication;
-    await app.initializedPromise;
-    
+    await app.initializedPromise;    
+
     app.eventBus.on("documentloaded", () => {
         const storage = app.pdfDocument.annotationStorage;
+        let timeout = null;
+
+        function debouncedSave() {
+            if (timeout) {
+                clearTimeout(timeout);
+            }
+            timeout = setTimeout(async () => {
+                console.log("Triggered debounce save");
+                const data = await app.pdfDocument.saveDocument();
+                window.parent.postMessage({
+                    type: "pdfjs-viewer-document-modified",
+                    data: data 
+                }, "*");
+                storage.resetModified();
+                timeout = null;
+            }, 2_000);
+        }
         
         storage.onSetModified = async () => {
-            console.log("Document modified");
-            const data = await app.pdfDocument.saveDocument();
-            window.parent.postMessage({
-                type: "pdfjs-viewer-document-modified",
-                data: data 
-            }, "*");
-            storage.resetModified();
+            debouncedSave();
         };
     });
 };