Migrating shared-operations to TS (WIP)

shared-operations/functions/scalePage.ts

@@ -0,0 +1,32 @@
+
+import { PDFDocument, ParseSpeeds } from 'pdf-lib';
+
+export async function scalePage(snapshot: string | Uint8Array | ArrayBuffer, pageSize: {width:number,height:number}): Promise<Uint8Array> {
+    // Load the original PDF file
+    const pdfDoc = await PDFDocument.load(snapshot, {
+        parseSpeed: ParseSpeeds.Fastest,
+    });
+
+    const new_size = pageSize;
+
+    const pages = pdfDoc.getPages();
+
+    pages.forEach(page => {
+        // Change page size
+        page.setSize(new_size.width, new_size.height);
+    });
+
+    // Serialize the modified document
+    return pdfDoc.save();
+};
+
+export const PageSize = {
+    a4: {
+        width: 594.96,
+        height: 841.92
+    },
+    letter: {
+        width: 612,
+        height: 792
+    }
+};