From a77b5601be9d17c3f241229feef06e7083262ea1 Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Thu, 19 Feb 2026 21:09:13 +0200
Subject: [PATCH] feat(pdfjs): add script to update viewer

---
 .../pdfjs-viewer/scripts/update-viewer.ts     | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 packages/pdfjs-viewer/scripts/update-viewer.ts

diff --git a/packages/pdfjs-viewer/scripts/update-viewer.ts b/packages/pdfjs-viewer/scripts/update-viewer.ts
new file mode 100644
index 0000000000..b38af11ba5
--- /dev/null
+++ b/packages/pdfjs-viewer/scripts/update-viewer.ts
@@ -0,0 +1,52 @@
+import { join } from "path";
+import packageJson from "../package.json" with { type: "json" };
+import * as yauzl from "yauzl";
+import { createWriteStream } from "fs";
+const version = packageJson.devDependencies["pdfjs-dist"];
+const url = `https://github.com/mozilla/pdf.js/releases/download/v${version}/pdfjs-${version}-dist.zip`;
+
+const FILES_TO_COPY = [
+    "web/images/",
+    "web/locale/",
+    "web/viewer.css",
+    "web/viewer.html",
+    "web/viewer.mjs"
+];
+
+async function main() {
+    console.log(`Downloading pdfjs-dist v${version} from ${url}...`);
+    const response = await fetch(url);
+    if (!response.ok) {
+        throw new Error(`Failed to download pdfjs-dist from ${url}: ${response.status} ${response.statusText}`);
+    }
+
+    const buffer = await response.arrayBuffer();
+    yauzl.fromBuffer(Buffer.from(buffer), { lazyEntries: true }, (err, zip) => {
+        zip.readEntry();
+        zip.on("entry", (entry: yauzl.Entry) => {
+            if (entry.fileName.endsWith("/") || !FILES_TO_COPY.some(prefix => entry.fileName.startsWith(prefix))) {
+                // Directory entry or not in the list of files to copy, skip
+                console.log("Skipping", entry.fileName);
+                zip.readEntry();
+                return;
+            }
+
+            const relativePath = entry.fileName.substring("web/".length);
+            zip.openReadStream(entry, (err, readStream) => {
+                if (err) {
+                    console.error(`Failed to read ${entry.fileName} from zip:`, err);
+                    return;
+                }
+                const outPath = join(__dirname, "../viewer", relativePath);
+                const outStream = createWriteStream(outPath);
+                readStream.pipe(outStream);
+                outStream.on("finish", () => {
+                    console.log(`Extracted ${relativePath} to ${outPath}`);
+                });
+            });
+            zip.readEntry();
+        });
+    });
+};
+
+main();