var es = new EventState({
    // Define an initial state with default value
    'initial': { data: ['foo'] }
  });

  // Emit a ready state with data of `null`
  es.emitState('ready');

  // Emit an "initial" state with data
  es.emitState('initial', { data: ['foo'] });

  es.once('ready', function() {
    // Run once ready / already ready
  });

  es.addListener('initial', function(value) {
    // Get the value and have it kept updated on changes
  });

  // Removes all listeners for event `ready`
  es.removeAllListeners('ready');

  // Empty value map
  es.clearState('ready');

  // Removes all listeners
  es.removeAllListeners();

  // Empty value map
  es.clearState();