Changing Order of Pages in PDF file using Google Apps Script

/**
 * ### Description
 * Changing order of pages in a PDF file.
 *
 * @param {Object} fileId is file ID of PDF file. newOrderOfpages is new order of pages. About "ignoreSkippedPages", if this is false, when the PDF has 5 pages and "newOrderOfpages" is "[3, 2]", the exported PDF file has 5 pages of 3, 2, 1, 4, 5. If this is true, when the PDF has 5 pages and "newOrderOfpages" is "[3, 2]", the exported PDF file has only 2 pages of 3 and 2.
 * @return {void}
 */
async function changeOrderOfPDFPages_({
  fileId,
  newOrderOfpages,
  ignoreSkippedPages,
}) {
  // Load pdf-lib
  const cdnjs = "https://cdn.jsdelivr.net/npm/pdf-lib/dist/pdf-lib.min.js";
  eval(UrlFetchApp.fetch(cdnjs).getContentText()); // Load pdf-lib
  const setTimeout = function (f, t) {
    Utilities.sleep(t);
    return f();
  };

  const blob = DriveApp.getFileById(fileId).getBlob();
  const pdfData = await PDFLib.PDFDocument.load(
    new Uint8Array(blob.getBytes())
  );
  const numberOfPages = pdfData.getPageCount();
  const maxPage = Math.max(...newOrderOfpages);
  if (numberOfPages < maxPage || numberOfPages < newOrderOfpages.length) {
    throw new Error(
      "Maximum page in the order of pages is over than the maximum page of the original PDF file."
    );
  }
  let skippedPages = [];
  if (!ignoreSkippedPages && numberOfPages > newOrderOfpages.length) {
    skippedPages = [...Array(numberOfPages)]
      .map((_, i) => i + 1)
      .filter((e) => !newOrderOfpages.includes(e));
  }
  const pdfDoc = await PDFLib.PDFDocument.create();
  const pages = await pdfDoc.copyPages(
    pdfData,
    [...Array(numberOfPages)].map((_, i) => i)
  );
  [...newOrderOfpages, ...skippedPages].forEach((e) =>
    pdfDoc.addPage(pages[e - 1])
  );
  const bytes = await pdfDoc.save();
  return Utilities.newBlob(
    [...new Int8Array(bytes)],
    MimeType.PDF,
    "sample.pdf"
  );
}

function main() {
  const fileId = "###"; // Please set a file ID of your a PDF file or a file ID of Google Docs files (Document, Spreadsheet, Slide).
  const newOrderOfpages = [3, 1, 2, 5, 4]; // Please set new order of the pages in a PDF file. In this sample, the order of pages of the original PDF file is changed to 3, 1, 2, 5, 4.
  const ignoreSkippedPages = false; // If this is false, when the PDF has 5 pages and "newOrderOfpages" is "[3, 2]", the exported PDF file has 5 pages of 3, 2, 1, 4, 5. If this is true, when the PDF has 5 pages and "newOrderOfpages" is "[3, 2]", the exported PDF file has only 2 pages of 3 and 2.

  changeOrderOfPDFPages_({ fileId, newOrderOfpages, ignoreSkippedPages }).then(
    (blob) => {
      DriveApp.createFile(blob.setName("sample.pdf"));
    }
  );
}