@ungap/weakrefs/min.js

WeakRef and FinalizationGroup for IE11+

/*! (c) Andrea Giammarchi - ISC */
var self=this||{};try{self.WeakRef=WeakRef,self.FinalizationGroup=FinalizationGroup}catch(e){!function(e,t){var i=new e;function n(e){i.set(this,e)}t(n.prototype,{deref:{value:function(){return i.get(this)}}});var a=new e;function r(e){a.set(this,[])}t(r.prototype,{register:{value:function(e,t){var i=a.get(this);i.indexOf(t)<0&&i.push(t)}},unregister:{value:function(e,t){var i=a.get(this),n=i.indexOf(t);return-1<n&&i.splice(n,1),-1<n}},cleanupSome:{value:function(e){e(a.get(this))}}}),self.WeakRef=n,self.FinalizationGroup=r}(WeakMap,Object.defineProperties)}