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if the has other elements assigned to it these are flattened as well the provided callback is called whenever any change to this list of flattened nodes occurs where an addition or removal of a node is considered a change the callback is called with one argument an object containing an array of any addednodes and removednodes note the callback is called asynchronous to any changes at a microtask checkpoint this is because observation is performed using mutationobserver and the element s slotchange event which are asynchronous an example js class testselfobserve extends polymer element static get is return test self observe connectedcallback super connectedcallback this _observer new polymer flattenednodesobserver this info this info info disconnectedcallback super disconnectedcallback this _observer disconnect customelements define testselfobserve is testselfobserve memberof polymer summary class that listens for changes additions or removals to flattened nodes on a given node class flattenednodesobserver returns the list of flattened nodes for the given node this list consists of a node s children and for any children that are elements the expanded flattened list of assignednodes for example if the observed node has children and the has one assigned to it then the flattened nodes list is if the has other elements assigned to it these are flattened as well param htmlelement htmlslotelement node the node for which to return the list of flattened nodes return array the list of flattened nodes for the given node static getflattenednodes node if isslot node node type htmlslotelement node eslint disable line no self assign return node assignednodes flatten true else return array from node childnodes map node if isslot node node type htmlslotelement node eslint disable line no self assign return node assignednodes flatten true else return node reduce a b a concat b param element target node on which to listen for changes param function element target element addednodes array removednodes array void callback function called when there are additions or removals from the target s list of flattened nodes constructor target callback type mutationobserver private this _shadychildrenobserver null type mutationobserver private this _nativechildrenobserver null this _connected false type element private this _target target this callback callback this _effectivenodes this _observer null this _scheduled false type function private this _boundschedule this _schedule this connect this _schedule activates an observer this method is automatically called when a flattenednodesobserver is created it should only be called to re activate an observer that has been deactivated via the disconnect method return void connect if isslot this _target this _listenslots this _target else if this _target children this _listenslots this _target children if window shadydom this _shadychildrenobserver shadydom observechildren this _target mutations this _processmutations mutations else this _nativechildrenobserver new mutationobserver mutations this _processmutations mutations this _nativechildrenobserver observe this _target childlist true this _connected true deactivates the flattened nodes observer after calling this method the observer callback will not be called when changes to flattened nodes occur the connect method may be subsequently called to reactivate the observer return void disconnect if isslot this _target this _unlistenslots this _target else if this _target children this _unlistenslots this _target children if window shadydom this _shadychildrenobserver shadydom unobservechildren this _shadychildrenobserver this _shadychildrenobserver null else if this _nativechildrenobserver this _nativechildrenobserver disconnect this _nativechildrenobserver null this _connected false return void private _schedule if this _scheduled this _scheduled true polymer async microtask run this flush param array mutations mutations signaled by the mutation observer return void private _processmutations mutations this _processslotmutations mutations this flush param array mutations mutations signaled by the mutation observer return void private _processslotmutations mutations if mutations for let i 0 i nodelist nodelist nodes that could change return void private _listenslots nodelist for let i 0 i nodelist nodelist nodes that could change return void private _unlistenslots nodelist for let i 0 i super template static get partialtemplate return polymer html partial memberof polymer param itemplatearray strings constant parts of tagged template literal param values variable parts of tagged template literal return htmltemplateelement constructed htmltemplateelement polymer html function html strings values const template type htmltemplateelement document createelement template template innerhtml values reduce acc v idx acc htmlvalue v strings idx 1 strings 0 return template an html literal tag that can be used with polymer html to compose a literal string example static get template return polymer html staticvalue super template static get styletemplate return polymer htmlliteral shadowed background gray memberof polymer param itemplatearray strings constant parts of tagged template literal param values variable parts of tagged template literal return literalstring constructed literal string polymer htmlliteral function strings values return new literalstring values reduce acc v idx acc literalvalue v strings idx 1 strings 0 log in log in oss fuzz testcases fuzzer statistics crash statistics upload testcase jobs configuration report bug documentation