NodeJs- How to use persian text in PdfKit module?

Question

This is my code :

 var doc = new PDFDocument();

 var stream = doc.pipe(blobStream());

 doc.fontSize(25)

     .text(سلام به همه', 100, 80');


 doc.end();

 stream.on('finish', function() {

     iframe.src = stream.toBlobURL('application/pdf');

 });

See image below :

PdfKit module has a problem with unicode.

How can I build pdf with persian character ?