add mutation observer polyfill package

pkg/mutation_observer/lib/mutation_observer.min.js

+if(!window.MutationObserver&&!window.WebKitMutationObserver){!function(global){var SideTable;if(typeof WeakMap!=="undefined"&&navigator.userAgent.indexOf("Firefox/")<0){SideTable=WeakMap}else{!function(){var defineProperty=Object.defineProperty;var hasOwnProperty=Object.hasOwnProperty;var counter=(new Date).getTime()%1e9;SideTable=function(){this.name="__st"+(Math.random()*1e9>>>0)+(counter++ +"__")};SideTable.prototype={set:function(key,value){defineProperty(key,this.name,{value:value,writable:true})},get:function(key){return hasOwnProperty.call(key,this.name)?key[this.name]:undefined},"delete":function(key){this.set(key,undefined)}}}()}var registrationsTable=new SideTable;var setImmediate=window.msSetImmediate;if(!setImmediate){var setImmediateQueue=[];var sentinel=String(Math.random());window.addEventListener("message",function(e){if(e.data===sentinel){var queue=setImmediateQueue;setImmediateQueue=[];queue.forEach(function(func){func()})}});setImmediate=function(func){setImmediateQueue.push(func);window.postMessage(sentinel,"*")}}var isScheduled=false;var scheduledObservers=[];function scheduleCallback(observer){scheduledObservers.push(observer);if(!isScheduled){isScheduled=true;setImmediate(dispatchCallbacks)}}function wrapIfNeeded(node){return window.ShadowDOMPolyfill&&window.ShadowDOMPolyfill.wrapIfNeeded(node)||node}function dispatchCallbacks(){isScheduled=false;var observers=scheduledObservers;scheduledObservers=[];observers.sort(function(o1,o2){return o1.uid_-o2.uid_});var anyNonEmpty=false;observers.forEach(function(observer){var queue=observer.takeRecords();removeTransientObserversFor(observer);if(queue.length){observer.callback_(queue,observer);anyNonEmpty=true}});if(anyNonEmpty)dispatchCallbacks()}function removeTransientObserversFor(observer){observer.nodes_.forEach(function(node){var registrations=registrationsTable.get(node);if(!registrations)return;registrations.forEach(function(registration){if(registration.observer===observer)registration.removeTransientObservers()})})}function forEachAncestorAndObserverEnqueueRecord(target,callback){for(var node=target;node;node=node.parentNode){var registrations=registrationsTable.get(node);if(registrations){for(var j=0;j<registrations.length;j++){var registration=registrations[j];var options=registration.options;if(node!==target&&!options.subtree)continue;var record=callback(options);if(record)registration.enqueue(record)}}}}var uidCounter=0;function MutationObserver(callback){this.callback_=callback;this.nodes_=[];this.records_=[];this.uid_=++uidCounter}MutationObserver.prototype={get constructor(){return MutationObserver},observe:function(target,options){target=wrapIfNeeded(target);if(!options.childList&&!options.attributes&&!options.characterData||options.attributeOldValue&&!options.attributes||options.attributeFilter&&options.attributeFilter.length&&!options.attributes||options.characterDataOldValue&&!options.characterData){throw new SyntaxError}var registrations=registrationsTable.get(target);if(!registrations)registrationsTable.set(target,registrations=[]);var registration;for(var i=0;i<registrations.length;i++){if(registrations[i].observer===this){registration=registrations[i];registration.removeListeners();registration.options=options;break}}if(!registration){registration=new Registration(this,target,options);registrations.push(registration);this.nodes_.push(target)}registration.addListeners()},disconnect:function(){this.nodes_.forEach(function(node){var registrations=registrationsTable.get(node);for(var i=0;i<registrations.length;i++){var registration=registrations[i];if(registration.observer===this){registration.removeListeners();registrations.splice(i,1);break}}},this);this.records_=[]},takeRecords:function(){var copyOfRecords=this.records_;this.records_=[];return copyOfRecords}};function MutationRecord(type,target){this.type=type;this.target=target;this.addedNodes=[];this.removedNodes=[];this.previousSibling=null;this.nextSibling=null;this.attributeName=null;this.attributeNamespace=null;this.oldValue=null}function copyMutationRecord(original){var record=new MutationRecord(original.type,original.target);record.addedNodes=original.addedNodes.slice();record.removedNodes=original.removedNodes.slice();record.previousSibling=original.previousSibling;record.nextSibling=original.nextSibling;record.attributeName=original.attributeName;record.attributeNamespace=original.attributeNamespace;record.oldValue=original.oldValue;return record}var currentRecord,recordWithOldValue;function getRecord(type,target){return currentRecord=new MutationRecord(type,target)}function getRecordWithOldValue(oldValue){if(recordWithOldValue)return recordWithOldValue;recordWithOldValue=copyMutationRecord(currentRecord);recordWithOldValue.oldValue=oldValue;return recordWithOldValue}function clearRecords(){currentRecord=recordWithOldValue=undefined}function recordRepresentsCurrentMutation(record){return record===recordWithOldValue||record===currentRecord}function selectRecord(lastRecord,newRecord){if(lastRecord===newRecord)return lastRecord;if(recordWithOldValue&&recordRepresentsCurrentMutation(lastRecord))return recordWithOldValue;return null}function Registration(observer,target,options){this.observer=observer;this.target=target;this.options=options;this.transientObservedNodes=[]}Registration.prototype={enqueue:function(record){var records=this.observer.records_;var length=records.length;if(records.length>0){var lastRecord=records[length-1];var recordToReplaceLast=selectRecord(lastRecord,record);if(recordToReplaceLast){records[length-1]=recordToReplaceLast;return}}else{scheduleCallback(this.observer)}records[length]=record},addListeners:function(){this.addListeners_(this.target)},addListeners_:function(node){var options=this.options;if(options.attributes)node.addEventListener("DOMAttrModified",this,true);if(options.characterData)node.addEventListener("DOMCharacterDataModified",this,true);if(options.childList)node.addEventListener("DOMNodeInserted",this,true);if(options.childList||options.subtree)node.addEventListener("DOMNodeRemoved",this,true)},removeListeners:function(){this.removeListeners_(this.target)},removeListeners_:function(node){var options=this.options;if(options.attributes)node.removeEventListener("DOMAttrModified",this,true);if(options.characterData)node.removeEventListener("DOMCharacterDataModified",this,true);if(options.childList)node.removeEventListener("DOMNodeInserted",this,true);if(options.childList||options.subtree)node.removeEventListener("DOMNodeRemoved",this,true)},addTransientObserver:function(node){if(node===this.target)return;this.addListeners_(node);this.transientObservedNodes.push(node);var registrations=registrationsTable.get(node);if(!registrations)registrationsTable.set(node,registrations=[]);registrations.push(this)},removeTransientObservers:function(){var transientObservedNodes=this.transientObservedNodes;this.transientObservedNodes=[];transientObservedNodes.forEach(function(node){this.removeListeners_(node);var registrations=registrationsTable.get(node);for(var i=0;i<registrations.length;i++){if(registrations[i]===this){registrations.splice(i,1);break}}},this)},handleEvent:function(e){e.stopImmediatePropagation();switch(e.type){case"DOMAttrModified":var name=e.attrName;var namespace=e.relatedNode.namespaceURI;var target=e.target;var record=new getRecord("attributes",target);record.attributeName=name;record.attributeNamespace=namespace;var oldValue=e.attrChange===MutationEvent.ADDITION?null:e.prevValue;forEachAncestorAndObserverEnqueueRecord(target,function(options){if(!options.attributes)return;if(options.attributeFilter&&options.attributeFilter.length&&options.attributeFilter.indexOf(name)===-1&&options.attributeFilter.indexOf(namespace)===-1){return}if(options.attributeOldValue)return getRecordWithOldValue(oldValue);return record});break;case"DOMCharacterDataModified":var target=e.target;var record=getRecord("characterData",target);var oldValue=e.prevValue;forEachAncestorAndObserverEnqueueRecord(target,function(options){if(!options.characterData)return;if(options.characterDataOldValue)return getRecordWithOldValue(oldValue);return record});break;case"DOMNodeRemoved":this.addTransientObserver(e.target);case"DOMNodeInserted":var target=e.relatedNode;var changedNode=e.target;var addedNodes,removedNodes;if(e.type==="DOMNodeInserted"){addedNodes=[changedNode];removedNodes=[]}else{addedNodes=[];removedNodes=[changedNode]}var previousSibling=changedNode.previousSibling;var nextSibling=changedNode.nextSibling;var record=getRecord("childList",target);record.addedNodes=addedNodes;record.removedNodes=removedNodes;record.previousSibling=previousSibling;record.nextSibling=nextSibling;forEachAncestorAndObserverEnqueueRecord(target,function(options){if(!options.childList)return;return record})}clearRecords()}};global.MutationObserver=MutationObserver}(window)}