(function(root){var module={exports:{}};(function(require,exports,module){"use strict";function createAction(spec,base){function action(data){return action.emit(data)}action._listeners=[];if(spec)ext(action,spec);return ext(action,base)}function axn(spec){return createAction(spec,axn.methods)}function aaxn(spec){return ext(createAction(spec,aaxn.methods),axn.methods)}function ext(obj,src){for(var key in src){if(src.hasOwnProperty(key)){if(obj.hasOwnProperty(key))continue;obj[key]=src[key]}}return obj}axn.methods={_cb:function(fn,ctx){return function(data,result){return fn.call(ctx,data,result)}},_listen:function(fn,ctx,once){var cb=this._cb(fn,ctx);this._listeners.push(cb);cb.ctx=ctx;cb.fn=fn;cb.once=once;var self=this;return function(){var i=self._listeners.indexOf(cb);if(i===-1)return false;self._listeners.splice(i,1);return true}},listenOnce:function(fn,ctx){return this._listen(fn,ctx,true)},listen:function(fn,ctx){return this._listen(fn,ctx,false)},unlisten:function(fn,ctx){for(var i=0;i<this._listeners.length;i++){var listener=this._listeners[i];if(listener.fn===fn&&listener.ctx===ctx){this._listeners.splice(i,1);return true}}return false},shouldEmit:function(){return true},beforeEmit:function(data){return data},_beforeEmit:function(data){return data},_afterEmit:function(result){return result},emit:function(){var data=Array.prototype.slice.call(arguments);if(data.length<2)data=data[0];data=this.beforeEmit(data);var initial=this._beforeEmit(data);var result=initial;if(!this.shouldEmit(data))return result;for(var i=0;i<this._listeners.length;i++){var listener=this._listeners[i];result=listener(data,result,initial);if(listener.once){this._listeners.splice(i,1);i-=1}}result=this._afterEmit(result,initial);return result}};aaxn.methods={_cb:function(fn,ctx){return function(data,p,p0){return p.then(function(result){if(p0._cancelled)return Promise.reject(new Error(p0._cancelled));return fn.call(ctx,data,result)})}},_beforeEmit:function(data){return ext(Promise.resolve(data),{_cancelled:false})},_afterEmit:function(p,p0){return ext(p.then(function(value){if(p0._cancelled)return Promise.reject(new Error(p0._cancelled));return value}),{cancel:function(reason){p0._cancelled=reason||"cancelled"},cancelled:function(){return Boolean(p0._cancelled)}})}};axn.async=aaxn;module.exports=axn})(function(key){return root[key]},module.exports,module);root.axn=module.exports})(this);