in src/common/channel.js [63:76]
var Channel = function (type, sticky) {
this.type = type;
// Map of guid -> function.
this.handlers = {};
// 0 = Non-sticky, 1 = Sticky non-fired, 2 = Sticky fired.
this.state = sticky ? 1 : 0;
// Used in sticky mode to remember args passed to fire().
this.fireArgs = null;
// Used by onHasSubscribersChange to know if there are any listeners.
this.numHandlers = 0;
// Function that is called when the first listener is subscribed, or when
// the last listener is unsubscribed.
this.onHasSubscribersChange = null;
};