55 lines
2.4 KiB
JavaScript
55 lines
2.4 KiB
JavaScript
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Object.defineProperty(exports,"__esModule",{value:true});var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor);}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor;};}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function");}}// A basic, minimalist EventEmitter
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// Subscription { remove() {} }
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var
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EventEmitter=function(){
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function EventEmitter(){_classCallCheck(this,EventEmitter);
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this.registry={};
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}_createClass(EventEmitter,[{key:"addListener",value:function addListener(
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eventType,listener){var _this=this;
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if(!this.registry[eventType]){
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this.registry[eventType]=[];
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}
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this.registry[eventType].push(listener);
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return{remove:function remove(){return _this.removeListener(eventType,listener);}};
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}},{key:"once",value:function once(
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eventType,listener,context){
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var h=function h(){for(var _len=arguments.length,args=Array(_len),_key=0;_key<_len;_key++){args[_key]=arguments[_key];}
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result.remove();
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listener.apply(context,args);
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};
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var result=this.addListener(eventType,h);
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return result;
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}},{key:"removeAllListeners",value:function removeAllListeners(
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eventType){
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this.registry[eventType]=[];
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}
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// eslint-disable-next-line class-methods-use-this
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},{key:"removeSubscription",value:function removeSubscription(subscription){
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subscription.remove();
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}},{key:"listeners",value:function listeners(
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eventType){
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return this.registry[eventType];
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}},{key:"emit",value:function emit(
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eventType){for(var _len2=arguments.length,args=Array(_len2>1?_len2-1:0),_key2=1;_key2<_len2;_key2++){args[_key2-1]=arguments[_key2];}
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var events=this.registry[eventType];
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if(!events)return;
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events.forEach(function(handler){return handler.apply(undefined,args);});
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}},{key:"removeListener",value:function removeListener(
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eventType,listener){
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var events=this.registry[eventType];
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if(!events)return;
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var index=events.indexOf(listener);
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if(index===-1)return;
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events.splice(index,1);
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if(events.length===0){
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delete this.registry[eventType];
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}
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}}]);return EventEmitter;}();exports.default=EventEmitter;
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