(function(global,factory){typeof exports==="object"&&typeof module!=="undefined"?factory(exports,require("@most/prelude")):typeof define==="function"&&define.amd?define(["exports","@most/prelude"],factory):factory(global.mostMulticast=global.mostMulticast||{},global.mostPrelude)})(this,function(exports,_most_prelude){"use strict";var MulticastDisposable=function MulticastDisposable(source,sink){this.source=source;this.sink=sink;this.disposed=false};MulticastDisposable.prototype.dispose=function dispose(){if(this.disposed){return}this.disposed=true;var remaining=this.source.remove(this.sink);return remaining===0&&this.source._dispose()};function tryEvent(t,x,sink){try{sink.event(t,x)}catch(e){sink.error(t,e)}}function tryEnd(t,x,sink){try{sink.end(t,x)}catch(e){sink.error(t,e)}}var dispose=function(disposable){return disposable.dispose()};var emptyDisposable={dispose:function dispose$1(){}};var MulticastSource=function MulticastSource(source){this.source=source;this.sinks=[];this._disposable=emptyDisposable};MulticastSource.prototype.run=function run(sink,scheduler){var n=this.add(sink);if(n===1){this._disposable=this.source.run(this,scheduler)}return new MulticastDisposable(this,sink)};MulticastSource.prototype._dispose=function _dispose(){var disposable=this._disposable;this._disposable=emptyDisposable;return Promise.resolve(disposable).then(dispose)};MulticastSource.prototype.add=function add(sink){this.sinks=_most_prelude.append(sink,this.sinks);return this.sinks.length};MulticastSource.prototype.remove=function remove$1(sink){var i=_most_prelude.findIndex(sink,this.sinks);if(i>=0){this.sinks=_most_prelude.remove(i,this.sinks)}return this.sinks.length};MulticastSource.prototype.event=function event(time,value){var s=this.sinks;if(s.length===1){return s[0].event(time,value)}for(var i=0;i<s.length;++i){tryEvent(time,value,s[i])}};MulticastSource.prototype.end=function end(time,value){var s=this.sinks;for(var i=0;i<s.length;++i){tryEnd(time,value,s[i])}};MulticastSource.prototype.error=function error(time,err){var s=this.sinks;for(var i=0;i<s.length;++i){s[i].error(time,err)}};function multicast(stream){var source=stream.source;return source instanceof MulticastSource?stream:new stream.constructor(new MulticastSource(source))}exports["default"]=multicast;exports.MulticastSource=MulticastSource;Object.defineProperty(exports,"__esModule",{value:true})});