Export from JSON always return "Blob is not defined"

Question

I want to create an excel file from my database, after that the file will be saved in the stored/client/ folder.

I use export-from-json

import exportFromJSON from "export-from-json";
import fs from "fs";
import path from "path";
import { Blob } from "buffer";

import db from "./dbConnect";
import Client from "../models/Clients";

function isRealValue(obj) {
  return obj && obj !== "null" && obj !== "undefined";
}

async function exportData(client, time) {

  const postsDirectory = path.join(process.cwd(), `stored/client/${client}`);
  
  await db.dbConnect();

  const result = await Client.findOne({ client: client }).lean();
  await db.dbDisconnect();
  const exportType = exportFromJSON.types.xls;

  if (isRealValue(result)) {
    fs.writeFile(
      postsDirectory,
      exportFromJSON({ data: result.message, fileName: client, exportType }),
      function (err) {
        if (err) throw err;
        console.log("Results Received");
      }
    );
  }
}

const dataFn = { exportData };
export default dataFn;

but the result always "Blob is not defined". I have tried to change into simple data like export-from-json did and the result still the same.