ListenerMixin.js

module.exports = function(events, R) {

  return {
    listeners: {},

    addListener: function(key, fn) {
      events.on(key, fn);
      this.listeners[key] = fn;
    },

    componentWillUnmount: function() {
      R.forEach(function(key) {
        events.off(key, this.listeners[key]);
      }.bind(this), R.keys(this.listeners));
    }

  };

}