Quick example of connecting with publicKey?

Hi, I've seen that there is another similar question, but I still hope you as the creator of this very useful tool can help.

Basically I'm creating a small tool which would allow me to connect to my servers using one or another SSH key, and do some minot things there (file read/write).

While it's pretty obvious how to connect with a privateKey, and it works well, I see nowhere any docs on publicKey.

I've tried simply replacing privateKey with publicKey, but it seems like it's ignoring it.

Fails with: error {"level":"client-authentication"} Error: All configured authentication methods failed

So, do you have any quick tips maybe, if it's possible to easily tell ssh to use public key instead of private key? I mean, not sure if it should make a big difference...

Start by reviewing the node-ssh authentication documentation and the SSH2 authentication options referenced by the publicKey and privateKey examples. Determine whether publicKey-only authentication is supported, then document the correct configuration or clearly state the limitation, including the authentication failure shown in the issue.