requirebin sketch

index.js

var async = require("async");

var functions = [];

for(var i = 0; i < 10000; i++) {
  functions.push(function leaky(next) {
    function func1(cb) {return cb(); }
    
    function func2(callback) {
      if (true) {
        return next();  // Should be callback here.
      }
      callback();
    }
    
    function func3(cb) {return cb(); }
  
    async.waterfall([
      func1,
      func2,
      func3
    ], next);
  });
}

var button = document.createElement("button");

button.innerHTML = "Run";

button.addEventListener("click", function () {
	button.innerHTML = "Running";

  async.parallel(functions, function () {
    button.innerHTML = "Done";
  });
});

document.body.appendChild(button);

minified.js

require=function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}({1:[function(require,module,exports){var process=module.exports={};process.nextTick=function(){var canSetImmediate=typeof window!=="undefined"&&window.setImmediate;var canMutationObserver=typeof window!=="undefined"&&window.MutationObserver;var canPost=typeof window!=="undefined"&&window.postMessage&&window.addEventListener;if(canSetImmediate){return function(f){return window.setImmediate(f)}}var queue=[];if(canMutationObserver){var hiddenDiv=document.createElement("div");var observer=new MutationObserver(function(){var queueList=queue.slice();queue.length=0;queueList.forEach(function(fn){fn()})});observer.observe(hiddenDiv,{attributes:true});return function nextTick(fn){if(!queue.length){hiddenDiv.setAttribute("yes","no")}queue.push(fn)}}if(canPost){window.addEventListener("message",function(ev){var source=ev.source;if((source===window||source===null)&&ev.data==="process-tick"){ev.stopPropagation();if(queue.length>0){var fn=queue.shift();fn()}}},true);return function nextTick(fn){queue.push(fn);window.postMessage("process-tick","*")}}return function nextTick(fn){setTimeout(fn,0)}}();process.title="browser";process.browser=true;process.env={};process.argv=[];function noop(){}process.on=noop;process.addListener=noop;process.once=noop;process.off=noop;process.removeListener=noop;process.removeAllListeners=noop;process.emit=noop;process.binding=function(name){throw new Error("process.binding is not supported")};process.cwd=function(){return"/"};process.chdir=function(dir){throw new Error("process.chdir is not supported")}},{}],async:[function(require,module,exports){(function(process){(function(){var async={};var root,previous_async;root=this;if(root!=null){previous_async=root.async}async.noConflict=function(){root.async=previous_async;return async};function only_once(fn){var called=false;return function(){if(called)throw new Error("Callback was already called.");called=true;fn.apply(root,arguments)}}var _toString=Object.prototype.toString;var _isArray=Array.isArray||function(obj){return _toString.call(obj)==="[object Array]"};var _each=function(arr,iterator){if(arr.forEach){return arr.forEach(iterator)}for(var i=0;i<arr.length;i+=1){iterator(arr[i],i,arr)}};var _map=function(arr,iterator){if(arr.map){return arr.map(iterator)}var results=[];_each(arr,function(x,i,a){results.push(iterator(x,i,a))});return results};var _reduce=function(arr,iterator,memo){if(arr.reduce){return arr.reduce(iterator,memo)}_each(arr,function(x,i,a){memo=iterator(memo,x,i,a)});return memo};var _keys=function(obj){if(Object.keys){return Object.keys(obj)}var keys=[];for(var k in obj){if(obj.hasOwnProperty(k)){keys.push(k)}}return keys};if(typeof process==="undefined"||!process.nextTick){if(typeof setImmediate==="function"){async.nextTick=function(fn){setImmediate(fn)};async.setImmediate=async.nextTick}else{async.nextTick=function(fn){setTimeout(fn,0)};async.setImmediate=async.nextTick}}else{async.nextTick=process.nextTick;if(typeof setImmediate!=="undefined"){async.setImmediate=function(fn){setImmediate(fn)}}else{async.setImmediate=async.nextTick}}async.each=function(arr,iterator,callback){callback=callback||function(){};if(!arr.length){return callback()}var completed=0;_each(arr,function(x){iterator(x,only_once(done))});function done(err){if(err){callback(err);callback=function(){}}else{completed+=1;if(completed>=arr.length){callback()}}}};async.forEach=async.each;async.eachSeries=function(arr,iterator,callback){callback=callback||function(){};if(!arr.length){return callback()}var completed=0;var iterate=function(){iterator(arr[completed],function(err){if(err){callback(err);callback=function(){}}else{completed+=1;if(completed>=arr.length){callback()}else{iterate()}}})};iterate()};async.forEachSeries=async.eachSeries;async.eachLimit=function(arr,limit,iterator,callback){var fn=_eachLimit(limit);fn.apply(null,[arr,iterator,callback])};async.forEachLimit=async.eachLimit;var _eachLimit=function(limit){return function(arr,iterator,callback){callback=callback||function(){};if(!arr.length||limit<=0){return callback()}var completed=0;var started=0;var running=0;(function replenish(){if(completed>=arr.length){return callback()}while(running<limit&&started<arr.length){started+=1;running+=1;iterator(arr[started-1],function(err){if(err){callback(err);callback=function(){}}else{completed+=1;running-=1;if(completed>=arr.length){callback()}else{replenish()}}})}})()}};var doParallel=function(fn){return function(){var args=Array.prototype.slice.call(arguments);return fn.apply(null,[async.each].concat(args))}};var doParallelLimit=function(limit,fn){return function(){var args=Array.prototype.slice.call(arguments);return fn.apply(null,[_eachLimit(limit)].concat(args))}};var doSeries=function(fn){return function(){var args=Array.prototype.slice.call(arguments);return fn.apply(null,[async.eachSeries].concat(args))}};var _asyncMap=function(eachfn,arr,iterator,callback){arr=_map(arr,function(x,i){return{index:i,value:x}});if(!callback){eachfn(arr,function(x,callback){iterator(x.value,function(err){callback(err)})})}else{var results=[];eachfn(arr,function(x,callback){iterator(x.value,function(err,v){results[x.index]=v;callback(err)})},function(err){callback(err,results)})}};async.map=doParallel(_asyncMap);async.mapSeries=doSeries(_asyncMap);async.mapLimit=function(arr,limit,iterator,callback){return _mapLimit(limit)(arr,iterator,callback)};var _mapLimit=function(limit){return doParallelLimit(limit,_asyncMap)};async.reduce=function(arr,memo,iterator,callback){async.eachSeries(arr,function(x,callback){iterator(memo,x,function(err,v){memo=v;callback(err)})},function(err){callback(err,memo)})};async.inject=async.reduce;async.foldl=async.reduce;async.reduceRight=function(arr,memo,iterator,callback){var reversed=_map(arr,function(x){return x}).reverse();async.reduce(reversed,memo,iterator,callback)};async.foldr=async.reduceRight;var _filter=function(eachfn,arr,iterator,callback){var results=[];arr=_map(arr,function(x,i){return{index:i,value:x}});eachfn(arr,function(x,callback){iterator(x.value,function(v){if(v){results.push(x)}callback()})},function(err){callback(_map(results.sort(function(a,b){return a.index-b.index}),function(x){return x.value}))})};async.filter=doParallel(_filter);async.filterSeries=doSeries(_filter);async.select=async.filter;async.selectSeries=async.filterSeries;var _reject=function(eachfn,arr,iterator,callback){var results=[];arr=_map(arr,function(x,i){return{index:i,value:x}});eachfn(arr,function(x,callback){iterator(x.value,function(v){if(!v){results.push(x)}callback()})},function(err){callback(_map(results.sort(function(a,b){return a.index-b.index}),function(x){return x.value}))})};async.reject=doParallel(_reject);async.rejectSeries=doSeries(_reject);var _detect=function(eachfn,arr,iterator,main_callback){eachfn(arr,function(x,callback){iterator(x,function(result){if(result){main_callback(x);main_callback=function(){}}else{callback()}})},function(err){main_callback()})};async.detect=doParallel(_detect);async.detectSeries=doSeries(_detect);async.some=function(arr,iterator,main_callback){async.each(arr,function(x,callback){iterator(x,function(v){if(v){main_callback(true);main_callback=function(){}}callback()})},function(err){main_callback(false)})};async.any=async.some;async.every=function(arr,iterator,main_callback){async.each(arr,function(x,callback){iterator(x,function(v){if(!v){main_callback(false);main_callback=function(){}}callback()})},function(err){main_callback(true)})};async.all=async.every;async.sortBy=function(arr,iterator,callback){async.map(arr,function(x,callback){iterator(x,function(err,criteria){if(err){callback(err)}else{callback(null,{value:x,criteria:criteria})}})},function(err,results){if(err){return callback(err)}else{var fn=function(left,right){var a=left.criteria,b=right.criteria;return a<b?-1:a>b?1:0};callback(null,_map(results.sort(fn),function(x){return x.value}))}})};async.auto=function(tasks,callback){callback=callback||function(){};var keys=_keys(tasks);var remainingTasks=keys.length;if(!remainingTasks){return callback()}var results={};var listeners=[];var addListener=function(fn){listeners.unshift(fn)};var removeListener=function(fn){for(var i=0;i<listeners.length;i+=1){if(listeners[i]===fn){listeners.splice(i,1);return}}};var taskComplete=function(){remainingTasks--;_each(listeners.slice(0),function(fn){fn()})};addListener(function(){if(!remainingTasks){var theCallback=callback;callback=function(){};theCallback(null,results)}});_each(keys,function(k){var task=_isArray(tasks[k])?tasks[k]:[tasks[k]];var taskCallback=function(err){var args=Array.prototype.slice.call(arguments,1);if(args.length<=1){args=args[0]}if(err){var safeResults={};_each(_keys(results),function(rkey){safeResults[rkey]=results[rkey]});safeResults[k]=args;callback(err,safeResults);callback=function(){}}else{results[k]=args;async.setImmediate(taskComplete)}};var requires=task.slice(0,Math.abs(task.length-1))||[];var ready=function(){return _reduce(requires,function(a,x){return a&&results.hasOwnProperty(x)},true)&&!results.hasOwnProperty(k)};if(ready()){task[task.length-1](taskCallback,results)}else{var listener=function(){if(ready()){removeListener(listener);task[task.length-1](taskCallback,results)}};addListener(listener)}})};async.retry=function(times,task,callback){var DEFAULT_TIMES=5;var attempts=[];if(typeof times==="function"){callback=task;task=times;times=DEFAULT_TIMES}times=parseInt(times,10)||DEFAULT_TIMES;var wrappedTask=function(wrappedCallback,wrappedResults){var retryAttempt=function(task,finalAttempt){return function(seriesCallback){task(function(err,result){seriesCallback(!err||finalAttempt,{err:err,result:result})},wrappedResults)}};while(times){attempts.push(retryAttempt(task,!(times-=1)))}async.series(attempts,function(done,data){data=data[data.length-1];(wrappedCallback||callback)(data.err,data.result)})};return callback?wrappedTask():wrappedTask};async.waterfall=function(tasks,callback){callback=callback||function(){};if(!_isArray(tasks)){var err=new Error("First argument to waterfall must be an array of functions");return callback(err)}if(!tasks.length){return callback()}var wrapIterator=function(iterator){return function(err){if(err){callback.apply(null,arguments);callback=function(){}}else{var args=Array.prototype.slice.call(arguments,1);var next=iterator.next();if(next){args.push(wrapIterator(next))}else{args.push(callback)}async.setImmediate(function(){iterator.apply(null,args)})}}};wrapIterator(async.iterator(tasks))()};var _parallel=function(eachfn,tasks,callback){callback=callback||function(){};if(_isArray(tasks)){eachfn.map(tasks,function(fn,callback){if(fn){fn(function(err){var args=Array.prototype.slice.call(arguments,1);if(args.length<=1){args=args[0]}callback.call(null,err,args)})}},callback)}else{var results={};eachfn.each(_keys(tasks),function(k,callback){tasks[k](function(err){var args=Array.prototype.slice.call(arguments,1);if(args.length<=1){args=args[0]}results[k]=args;callback(err)})},function(err){callback(err,results)})}};async.parallel=function(tasks,callback){_parallel({map:async.map,each:async.each},tasks,callback)};async.parallelLimit=function(tasks,limit,callback){_parallel({map:_mapLimit(limit),each:_eachLimit(limit)},tasks,callback)};async.series=function(tasks,callback){callback=callback||function(){};if(_isArray(tasks)){async.mapSeries(tasks,function(fn,callback){if(fn){fn(function(err){var args=Array.prototype.slice.call(arguments,1);if(args.length<=1){args=args[0]}callback.call(null,err,args)})}},callback)}else{var results={};async.eachSeries(_keys(tasks),function(k,callback){tasks[k](function(err){var args=Array.prototype.slice.call(arguments,1);if(args.length<=1){args=args[0]}results[k]=args;callback(err)})},function(err){callback(err,results)})}};async.iterator=function(tasks){var makeCallback=function(index){var fn=function(){if(tasks.length){tasks[index].apply(null,arguments)}return fn.next()};fn.next=function(){return index<tasks.length-1?makeCallback(index+1):null};return fn};return makeCallback(0)};async.apply=function(fn){var args=Array.prototype.slice.call(arguments,1);return function(){return fn.apply(null,args.concat(Array.prototype.slice.call(arguments)))}};var _concat=function(eachfn,arr,fn,callback){var r=[];eachfn(arr,function(x,cb){fn(x,function(err,y){r=r.concat(y||[]);cb(err)})},function(err){callback(err,r)})};async.concat=doParallel(_concat);async.concatSeries=doSeries(_concat);async.whilst=function(test,iterator,callback){if(test()){iterator(function(err){if(err){return callback(err)}async.whilst(test,iterator,callback)})}else{callback()}};async.doWhilst=function(iterator,test,callback){iterator(function(err){if(err){return callback(err)}var args=Array.prototype.slice.call(arguments,1);if(test.apply(null,args)){async.doWhilst(iterator,test,callback)}else{callback()}})};async.until=function(test,iterator,callback){if(!test()){iterator(function(err){if(err){return callback(err)}async.until(test,iterator,callback)})}else{callback()}};async.doUntil=function(iterator,test,callback){iterator(function(err){if(err){return callback(err)}var args=Array.prototype.slice.call(arguments,1);if(!test.apply(null,args)){async.doUntil(iterator,test,callback)}else{callback()}})};async.queue=function(worker,concurrency){if(concurrency===undefined){concurrency=1}function _insert(q,data,pos,callback){if(!q.started){q.started=true}if(!_isArray(data)){data=[data]}if(data.length==0){return async.setImmediate(function(){if(q.drain){q.drain()}})}_each(data,function(task){var item={data:task,callback:typeof callback==="function"?callback:null};if(pos){q.tasks.unshift(item)}else{q.tasks.push(item)}if(q.saturated&&q.tasks.length===q.concurrency){q.saturated()}async.setImmediate(q.process)})}var workers=0;var q={tasks:[],concurrency:concurrency,saturated:null,empty:null,drain:null,started:false,paused:false,push:function(data,callback){_insert(q,data,false,callback)},kill:function(){q.drain=null;q.tasks=[]},unshift:function(data,callback){_insert(q,data,true,callback)},process:function(){if(!q.paused&&workers<q.concurrency&&q.tasks.length){var task=q.tasks.shift();if(q.empty&&q.tasks.length===0){q.empty()}workers+=1;var next=function(){workers-=1;if(task.callback){task.callback.apply(task,arguments)}if(q.drain&&q.tasks.length+workers===0){q.drain()}q.process()};var cb=only_once(next);worker(task.data,cb)}},length:function(){return q.tasks.length},running:function(){return workers},idle:function(){return q.tasks.length+workers===0},pause:function(){if(q.paused===true){return}q.paused=true;q.process()},resume:function(){if(q.paused===false){return}q.paused=false;q.process()}};return q};async.priorityQueue=function(worker,concurrency){function _compareTasks(a,b){return a.priority-b.priority}function _binarySearch(sequence,item,compare){var beg=-1,end=sequence.length-1;while(beg<end){var mid=beg+(end-beg+1>>>1);if(compare(item,sequence[mid])>=0){beg=mid}else{end=mid-1}}return beg}function _insert(q,data,priority,callback){if(!q.started){q.started=true}if(!_isArray(data)){data=[data]}if(data.length==0){return async.setImmediate(function(){if(q.drain){q.drain()}})}_each(data,function(task){var item={data:task,priority:priority,callback:typeof callback==="function"?callback:null};q.tasks.splice(_binarySearch(q.tasks,item,_compareTasks)+1,0,item);if(q.saturated&&q.tasks.length===q.concurrency){q.saturated()}async.setImmediate(q.process)})}var q=async.queue(worker,concurrency);q.push=function(data,priority,callback){_insert(q,data,priority,callback)};delete q.unshift;return q};async.cargo=function(worker,payload){var working=false,tasks=[];var cargo={tasks:tasks,payload:payload,saturated:null,empty:null,drain:null,drained:true,push:function(data,callback){if(!_isArray(data)){data=[data]}_each(data,function(task){tasks.push({data:task,callback:typeof callback==="function"?callback:null});cargo.drained=false;if(cargo.saturated&&tasks.length===payload){cargo.saturated()}});async.setImmediate(cargo.process)},process:function process(){if(working)return;if(tasks.length===0){if(cargo.drain&&!cargo.drained)cargo.drain();cargo.drained=true;return}var ts=typeof payload==="number"?tasks.splice(0,payload):tasks.splice(0,tasks.length);var ds=_map(ts,function(task){return task.data});if(cargo.empty)cargo.empty();working=true;worker(ds,function(){working=false;var args=arguments;_each(ts,function(data){if(data.callback){data.callback.apply(null,args)}});process()})},length:function(){return tasks.length},running:function(){return working}};return cargo};var _console_fn=function(name){return function(fn){var args=Array.prototype.slice.call(arguments,1);fn.apply(null,args.concat([function(err){var args=Array.prototype.slice.call(arguments,1);if(typeof console!=="undefined"){if(err){if(console.error){console.error(err)}}else if(console[name]){_each(args,function(x){console[name](x)})}}}]))}};async.log=_console_fn("log");async.dir=_console_fn("dir");async.memoize=function(fn,hasher){var memo={};var queues={};hasher=hasher||function(x){return x};var memoized=function(){var args=Array.prototype.slice.call(arguments);var callback=args.pop();var key=hasher.apply(null,args);if(key in memo){async.nextTick(function(){callback.apply(null,memo[key])})}else if(key in queues){queues[key].push(callback)}else{queues[key]=[callback];fn.apply(null,args.concat([function(){memo[key]=arguments;var q=queues[key];delete queues[key];for(var i=0,l=q.length;i<l;i++){q[i].apply(null,arguments)}}]))}};memoized.memo=memo;memoized.unmemoized=fn;return memoized};async.unmemoize=function(fn){return function(){return(fn.unmemoized||fn).apply(null,arguments)}};async.times=function(count,iterator,callback){var counter=[];for(var i=0;i<count;i++){counter.push(i)}return async.map(counter,iterator,callback)};async.timesSeries=function(count,iterator,callback){var counter=[];for(var i=0;i<count;i++){counter.push(i)}return async.mapSeries(counter,iterator,callback)};async.seq=function(){var fns=arguments;return function(){var that=this;var args=Array.prototype.slice.call(arguments);var callback=args.pop();async.reduce(fns,args,function(newargs,fn,cb){fn.apply(that,newargs.concat([function(){var err=arguments[0];var nextargs=Array.prototype.slice.call(arguments,1);cb(err,nextargs)}]))},function(err,results){callback.apply(that,[err].concat(results))})}};async.compose=function(){return async.seq.apply(null,Array.prototype.reverse.call(arguments))};var _applyEach=function(eachfn,fns){var go=function(){var that=this;var args=Array.prototype.slice.call(arguments);var callback=args.pop();return eachfn(fns,function(fn,cb){fn.apply(that,args.concat([cb]))},callback)};if(arguments.length>2){var args=Array.prototype.slice.call(arguments,2);return go.apply(this,args)}else{return go}};async.applyEach=doParallel(_applyEach);async.applyEachSeries=doSeries(_applyEach);async.forever=function(fn,callback){function next(err){if(err){if(callback){return callback(err)}throw err}fn(next)}next()};if(typeof module!=="undefined"&&module.exports){module.exports=async}else if(typeof define!=="undefined"&&define.amd){define([],function(){return async})}else{root.async=async}})()}).call(this,require("_process"))},{_process:1}]},{},[]);var async=require("async");var functions=[];for(var i=0;i<1e4;i++){functions.push(function leaky(next){function func1(cb){return cb()}function func2(callback){if(true){return next()}callback()}function func3(cb){return cb()}async.waterfall([func1,func2,func3],next)})}var button=document.createElement("button");button.innerHTML="Run";button.addEventListener("click",function(){button.innerHTML="Running";async.parallel(functions,function(){button.innerHTML="Done"})});document.body.appendChild(button);

package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
    "async": "0.9.0"
  }
}

page-head.html

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body, html { height: 100%; width: 100%; }</style>

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