How to add Cyrillic support to PDF-LIB?

Question

JavaScript

There is an excellent library for generating PDF in JS, everything would be fine, but it does not support Cyrillic, or I could not figure it out. Tell me how to add Cyrillic support.

Library example

Answer 1

The library has documentation and it sounds like a refrain:

IMPORTANT : The default font used to update appearance streams is StandardFonts.Helvetica. Note that this is a WinAnsi font. This means that encoding errors will be thrown if this field contains any options with characters outside the WinAnsi character set (the latin alphabet).
Embedding a custom font and passing it to PDFForm.updateFieldAppearances or PDFOptionList.updateAppearances allows you to generate appearance streams with characters outside the latin alphabet (assuming the custom font supports them).