You can't open serial monitor without network connection

[HughGrant]

Because the extension will check the circuitpython bundle and download it, if this doesn't happen, you can't even open serial monitor. To reproduce this, you just close vscode, turn off wifi or network on your system, and reopen vscode.

Another issue is that I can't use command: "Show Available Libraries", it always prompt this error: cannot read property name of 'undefined'.

[RobCranfill]

I believe it's more than that - nothing in this plugin works if there is no network connection. Kind of a bummer for when I'm working away from an internet connection (yes, that's still a thing!).