gistfile1.js

builder
    .on('building', console.log.bind(console, 'building...'))
    .on('built', console.log.bind(console, 'built.'))
    .on('ready', console.log.bind(console, 'ready.'))
    .on('change', console.log.bind(console, 'changed:'))
    .on('watching', function(files) {
      console.log('watching', files.length, 'files.');
    })
    .build();