Migrating shared-operations to TS (WIP)

shared-operations/functions/splitPDF.ts

@@ -0,0 +1,28 @@
+
+import { PDFDocument } from 'pdf-lib';
+
+import { createSubDocument } from "./createSubDocument.js";
+
+export async function splitPDF(snapshot: string | Uint8Array | ArrayBuffer, splitAfterPageArray: number[]): Promise<Uint8Array[]> {
+
+    const pdfDoc = await PDFDocument.load(snapshot)
+
+    const numberOfPages = pdfDoc.getPages().length;
+
+    let pagesArray = [];
+    let splitAfter = splitAfterPageArray.shift();
+    const subDocuments = [];
+
+    for (let i = 0; i < numberOfPages; i++) {
+        if(splitAfter && i > splitAfter && pagesArray.length > 0) {
+            subDocuments.push(await createSubDocument(pdfDoc, pagesArray));
+            splitAfter = splitAfterPageArray.shift();
+            pagesArray = [];
+        }
+        pagesArray.push(i);
+    }
+    subDocuments.push(await createSubDocument(pdfDoc, pagesArray));
+    pagesArray = [];
+
+    return subDocuments;
+};