fix MutationObserver memory leak

http://code.google.com/p/chromium/issues/detail?id=160985
https://github.com/emberjs/ember.js/issues/1667

browser/rsvp.amd.js

@@ -30,6 +30,12 @@ define("rsvp",
       var element = document.createElement('div');
       observer.observe(element, { attributes: true });
 
+      // Chrome Memory Leak: https://bugs.webkit.org/show_bug.cgi?id=93661
+      window.addEventListener('unload', function(){
+        observer.disconnect();
+        observer = null;
+      });
+
       async = function(callback, binding) {
         queue.push([callback, binding]);
         element.setAttribute('drainQueue', 'drainQueue');

browser/rsvp.js

@@ -28,6 +28,12 @@
     var element = document.createElement('div');
     observer.observe(element, { attributes: true });
 
+    // Chrome Memory Leak: https://bugs.webkit.org/show_bug.cgi?id=93661
+    window.addEventListener('unload', function(){
+      observer.disconnect();
+      observer = null;
+    });
+
     async = function(callback, binding) {
       queue.push([callback, binding]);
       element.setAttribute('drainQueue', 'drainQueue');

browser/rsvp.min.js

-(function(e){"use strict";function v(e,t){r.async(function(){e.trigger("promise:resolved",{detail:t}),e.isResolved=!0,e.resolvedValue=t})}function m(e,t){r.async(function(){e.trigger("promise:failed",{detail:t}),e.isRejected=!0,e.rejectedValue=t})}var t=typeof window!="undefined"?window:{},n=t.MutationObserver||t.WebKitMutationObserver,r,i;if(typeof process!="undefined"&&{}.toString.call(process)==="[object process]")i=function(e,t){process.nextTick(function(){e.call(t)})};else if(n){var s=[],o=new n(function(){var e=s.slice();s=[],e.forEach(function(e){var t=e[0],n=e[1];t.call(n)})}),u=document.createElement("div");o.observe(u,{attributes:!0}),i=function(e,t){s.push([e,t]),u.setAttribute("drainQueue","drainQueue")}}else i=function(e,t){setTimeout(function(){e.call(t)},1)};var a=function(e,t){this.type=e;for(var n in t){if(!t.hasOwnProperty(n))continue;this[n]=t[n]}},f=function(e,t){for(var n=0,r=e.length;n<r;n++)if(e[n][0]===t)return n;return-1},l=function(e){var t=e._promiseCallbacks;return t||(t=e._promiseCallbacks={}),t},c={mixin:function(e){return e.on=this.on,e.off=this.off,e.trigger=this.trigger,e},on:function(e,t,n){var r=l(this),i,s;e=e.split(/\s+/),n=n||this;while(s=e.shift())i=r[s],i||(i=r[s]=[]),f(i,t)===-1&&i.push([t,n])},off:function(e,t){var n=l(this),r,i,s;e=e.split(/\s+/);while(i=e.shift()){if(!t){n[i]=[];continue}r=n[i],s=f(r,t),s!==-1&&r.splice(s,1)}},trigger:function(e,t){var n=l(this),r,i,s,o,u;if(r=n[e])for(var f=0,c=r.length;f<c;f++)i=r[f],s=i[0],o=i[1],typeof t!="object"&&(t={detail:t}),u=new a(e,t),s.call(o,u)}},h=function(){this.on("promise:resolved",function(e){this.trigger("success",{detail:e.detail})},this),this.on("promise:failed",function(e){this.trigger("error",{detail:e.detail})},this)},p=function(){},d=function(e,t,n,r){var i=typeof n=="function",s,o,u,a;if(i)try{s=n(r.detail),u=!0}catch(f){a=!0,o=f}else s=r.detail,u=!0;s&&typeof s.then=="function"?s.then(function(e){t.resolve(e)},function(e){t.reject(e)}):i&&u?t.resolve(s):a?t.reject(o):t[e](s)};h.prototype={then:function(e,t){var n=new h;return this.isResolved&&r.async(function(){d("resolve",n,e,{detail:this.resolvedValue})},this),this.isRejected&&r.async(function(){d("reject",n,t,{detail:this.rejectedValue})},this),this.on("promise:resolved",function(t){d("resolve",n,e,t)}),this.on("promise:failed",function(e){d("reject",n,t,e)}),n},resolve:function(e){v(this,e),this.resolve=p,this.reject=p},reject:function(e){m(this,e),this.resolve=p,this.reject=p}},c.mixin(h.prototype),r={async:i,Promise:h,Event:a,EventTarget:c},e.RSVP=r})(window);
+(function(exports){"use strict";var browserGlobal=typeof window!=="undefined"?window:{};var MutationObserver=browserGlobal.MutationObserver||browserGlobal.WebKitMutationObserver;var RSVP,async;if(typeof process!=="undefined"&&{}.toString.call(process)==="[object process]"){async=function(callback,binding){process.nextTick(function(){callback.call(binding)})}}else if(MutationObserver){var queue=[];var observer=new MutationObserver(function(){var toProcess=queue.slice();queue=[];toProcess.forEach(function(tuple){var callback=tuple[0],binding=tuple[1];callback.call(binding)})});var element=document.createElement("div");observer.observe(element,{attributes:true});window.addEventListener("unload",function(){observer.disconnect();observer=null});async=function(callback,binding){queue.push([callback,binding]);element.setAttribute("drainQueue","drainQueue")}}else{async=function(callback,binding){setTimeout(function(){callback.call(binding)},1)}}var Event=function(type,options){this.type=type;for(var option in options){if(!options.hasOwnProperty(option)){continue}this[option]=options[option]}};var indexOf=function(callbacks,callback){for(var i=0,l=callbacks.length;i<l;i++){if(callbacks[i][0]===callback){return i}}return-1};var callbacksFor=function(object){var callbacks=object._promiseCallbacks;if(!callbacks){callbacks=object._promiseCallbacks={}}return callbacks};var EventTarget={mixin:function(object){object.on=this.on;object.off=this.off;object.trigger=this.trigger;return object},on:function(eventNames,callback,binding){var allCallbacks=callbacksFor(this),callbacks,eventName;eventNames=eventNames.split(/\s+/);binding=binding||this;while(eventName=eventNames.shift()){callbacks=allCallbacks[eventName];if(!callbacks){callbacks=allCallbacks[eventName]=[]}if(indexOf(callbacks,callback)===-1){callbacks.push([callback,binding])}}},off:function(eventNames,callback){var allCallbacks=callbacksFor(this),callbacks,eventName,index;eventNames=eventNames.split(/\s+/);while(eventName=eventNames.shift()){if(!callback){allCallbacks[eventName]=[];continue}callbacks=allCallbacks[eventName];index=indexOf(callbacks,callback);if(index!==-1){callbacks.splice(index,1)}}},trigger:function(eventName,options){var allCallbacks=callbacksFor(this),callbacks,callbackTuple,callback,binding,event;if(callbacks=allCallbacks[eventName]){for(var i=0,l=callbacks.length;i<l;i++){callbackTuple=callbacks[i];callback=callbackTuple[0];binding=callbackTuple[1];if(typeof options!=="object"){options={detail:options}}event=new Event(eventName,options);callback.call(binding,event)}}}};var Promise=function(){this.on("promise:resolved",function(event){this.trigger("success",{detail:event.detail})},this);this.on("promise:failed",function(event){this.trigger("error",{detail:event.detail})},this)};var noop=function(){};var invokeCallback=function(type,promise,callback,event){var hasCallback=typeof callback==="function",value,error,succeeded,failed;if(hasCallback){try{value=callback(event.detail);succeeded=true}catch(e){failed=true;error=e}}else{value=event.detail;succeeded=true}if(value&&typeof value.then==="function"){value.then(function(value){promise.resolve(value)},function(error){promise.reject(error)})}else if(hasCallback&&succeeded){promise.resolve(value)}else if(failed){promise.reject(error)}else{promise[type](value)}};Promise.prototype={then:function(done,fail){var thenPromise=new Promise;if(this.isResolved){RSVP.async(function(){invokeCallback("resolve",thenPromise,done,{detail:this.resolvedValue})},this)}if(this.isRejected){RSVP.async(function(){invokeCallback("reject",thenPromise,fail,{detail:this.rejectedValue})},this)}this.on("promise:resolved",function(event){invokeCallback("resolve",thenPromise,done,event)});this.on("promise:failed",function(event){invokeCallback("reject",thenPromise,fail,event)});return thenPromise},resolve:function(value){resolve(this,value);this.resolve=noop;this.reject=noop},reject:function(value){reject(this,value);this.resolve=noop;this.reject=noop}};function resolve(promise,value){RSVP.async(function(){promise.trigger("promise:resolved",{detail:value});promise.isResolved=true;promise.resolvedValue=value})}function reject(promise,value){RSVP.async(function(){promise.trigger("promise:failed",{detail:value});promise.isRejected=true;promise.rejectedValue=value})}EventTarget.mixin(Promise.prototype);RSVP={async:async,Promise:Promise,Event:Event,EventTarget:EventTarget};exports.RSVP=RSVP})(window);

lib/rsvp.js

@@ -26,6 +26,12 @@ if (typeof process !== 'undefined' &&
   var element = document.createElement('div');
   observer.observe(element, { attributes: true });
 
+  // Chrome Memory Leak: https://bugs.webkit.org/show_bug.cgi?id=93661
+  window.addEventListener('unload', function(){
+    observer.disconnect();
+    observer = null;
+  });
+
   async = function(callback, binding) {
     queue.push([callback, binding]);
     element.setAttribute('drainQueue', 'drainQueue');