Migrating shared-operations to TS (WIP)

shared-operations/functions/scaleContent.ts

@@ -0,0 +1,30 @@
+
+import { PDFDocument, ParseSpeeds } from 'pdf-lib';
+
+export async function scaleContent(snapshot: string | Uint8Array | ArrayBuffer, scaleFactor: number): Promise<Uint8Array> {
+    // Load the original PDF file
+    const pdfDoc = await PDFDocument.load(snapshot, {
+        parseSpeed: ParseSpeeds.Fastest,
+    });
+
+    const pages = pdfDoc.getPages();
+
+    pages.forEach(page => {
+        const width = page.getWidth();
+        const height = page.getHeight();
+        
+        // Scale content
+        page.scaleContent(scaleFactor, scaleFactor);
+        const scaled_diff = {
+            width: Math.round(width - scaleFactor * width),
+            height: Math.round(height - scaleFactor * height),
+        };
+
+        // Center content in new page format
+        page.translateContent(Math.round(scaled_diff.width / 2), Math.round(scaled_diff.height / 2));
+
+    });
+
+    // Serialize the modified document
+    return pdfDoc.save();
+};