How do I catch a specific exception?

[YuMurata]

Hi.
I want to catch exceptions and handle them differently depending on the type of exception.

For example:

try {
...
} catch(err) {
  if(err instanceof UserOfflineError) {
    console.log('offline')
    return
  }
  throw err
} 

However, I can't do this because the Error class of TikTok-Live-Connector doesn't seem to be exported.

Please tell me what to do.

Thanks.