spark-io-wave.js

var five = require("johnny-five");
var Spark = require("spark-io");

var board = new five.Board({
  io: new Spark({
    token: "a81cf99a8c1fe45b74d749d521a32671eb443d5e",
    deviceId: "53ff6f065067544840551187"
  })
});

board.on("ready", function() {
  var dir = 0;
  var servo = new five.Servo("D0");

  setInterval(function() {
    var pos = 120;
    if (dir ^= 1) {
      pos = 60;
    }
    servo.to(pos);
  }, 750);
});

I editied the require just to require all of johnny-five.

Directions:

1. have node installed: http://nodejs.org/download/ Or you can install it via homebrew

2. copy the above into a folder, name it spark-io-wave.js

3. In terminal, cd into that folder and run:
   npm install spark-io
   npm install johnny-five

4. Now make that robot dance by running:
   node spark-io-wave.js