csv to stream doesn't work

[Imperat]

Hi, guys! Thank you for you open source library. In the last week I had task to export some data in excel document. I use this small code:

const Excel = require('exceljs');
const Readable = require('stream').Readable;
const Writable = require('stream').Writable;

const stream2n = new Writable();
stream2n.result = [];
stream2n._write = function (chunk, enc, next) {
  this.result.push(chunk);
};

const stream1n = new Readable();
stream1n._read = function () {
  stream1n.push(stream2n.result.shift() || null);
};

const workbook = new Excel.Workbook();
const pageName = 'Page name';
workbook.addWorksheet(pageName);

workbook.getWorksheet(pageName).addRow([1, 2, 3, 4, 5]);
let promise2 = new Promise((resolve, reject) => {
  
  workbook.xlsx.write(stream2n).then(() => {
    setTimeout(() => console.log('RESOLVED!'), 500);
    resolve(true);
  });
});

console.log('AT THE END');

It works nice, but now I have task to import doc as csv file. I change just one line:
workbook.xlsx.write(stream2n).then(() => { I change with:
workbook.csv.write(stream2n).then(() => {
But now read stream will never closed. Have you any advice how I can fix it? It seems that this is the bug of exceljs. Thanks!