Keypad status for ESP32?

I'm trying to use the keypad module without success. The recommended:

require("KeyPad").connect([B2,B3,B4,B5],[B6,B7,B8,B9], function(e) {
  print("123A456B789C*0#D"[e]);
});

is never called back.

I also tried

var keypad = require("KeyPad").connect([B2,B3,B4,B5],[B6,B7,B8,B9]);

and printed output of keypad.read() in a while loop. This produced output like 38 28 08 312 212 012 etc. depending on the key pressed.

I tested the same keypad using the same pin connections on the same device in an arduino sketch where it worked perfectly.

Anyway, since there was at least some output, I was going to start hacking on the source code but in the meantime, is anyone using a keypad successfully?

Thanks for any pointers ...