Encoding issues - garbled japanese characters results after 'parse' function

[maksimlya]

Hi, I am having issues with my email client. Some users report garbled characters on their ends. Most of these users have non-standard text values. I have managed to reproduce the issue, but not sure how to tackle it. I saw some other tickets suggesting to use different methods, but they did not provide an example.

Here is a git with my issue:

https://github.com/maksimlya/emailjs-imap-handler-garbled-example

Can:
git clone
npm i
npm start

put a breakpoint at
console.log(res);

and see the 'Subject' text is garbled, altho I could read it correctly using TextDecoder.

This is the result I get from 'TextDecoder().decode(testVal):

* 17 FETCH (UID 27 BODY[HEADER.FIELDS (FROM TO CC BCC SUBJECT REPLY-TO MESSAGE-ID REFERENCES IN-REPLY-TO X-WELCOME X-WELCOME-EMAIL X-SSHIDE X-SSSINGLEHIDE DISPOSITION-NOTIFICATION-TO X-CONFIRM-READING-TO RETURN-RECEIPT-TO X-PRIORITY IMPORTANCE)] {81}\r\nFrom: sender@example.com\nTo: recipient@example.com\nSubject: テストメール\n\r\n)

And this is the counter-part of that value after using parse function from this lib:

From: sender@example.com\nTo: recipient@example.com\nSubject: ������\n\r\n

Any advice / solution?

I've tried to convert the Uint8Array to string, then converting it back with the 'suggested' method of using 'fromCharCode(0)', but that resulted with other errors of 'Unexpected char at position x', so I'm not quite sure what to do.