gistfile1.js

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});
board.on("ready", function() {
  var button = new five.Button({
    pin: "a0",
    invert: true
  });

  board.repl.inject({
    button: button
  });

  button.on("hold", function() {
    console.log( "Button held" );
  });

  button.on("press", function() {
    console.log( "Button pressed" );
  });

  button.on("release", function() {
    console.log( "Button released" );
  });

});