var t=function(){if("undefined"!=typeof Map)return Map;function t(t,e){var n=-1;return t.some((function(t,r){return t[0]===e&&(n=r,!0)})),n}return function(){function e(){this.__entries__=[]}return Object.defineProperty(e.prototype,"size",{get:function(){return this.__entries__.length},enumerable:!0,configurable:!0}),e.prototype.get=function(e){var n=t(this.__entries__,e),r=this.__entries__[n];return r&&r[1]},e.prototype.set=function(e,n){var r=t(this.__entries__,e);~r?this.__entries__[r][1]=n:this.__entries__.push([e,n])},e.prototype.delete=function(e){var n=this.__entries__,r=t(n,e);~r&&n.splice(r,1)},e.prototype.has=function(e){return!!~t(this.__entries__,e)},e.prototype.clear=function(){this.__entries__.splice(0)},e.prototype.forEach=function(t,e){void 0===e&&(e=null);for(var n=0,r=this.__entries__;n0},t.prototype.connect_=function(){e&&!this.connected_&&(document.addEventListener("transitionend",this.onTransitionEnd_),window.addEventListener("resize",this.refresh),o?(this.mutationsObserver_=new MutationObserver(this.refresh),this.mutationsObserver_.observe(document,{attributes:!0,childList:!0,characterData:!0,subtree:!0})):(document.addEventListener("DOMSubtreeModified",this.refresh),this.mutationEventsAdded_=!0),this.connected_=!0)},t.prototype.disconnect_=function(){e&&this.connected_&&(document.removeEventListener("transitionend",this.onTransitionEnd_),window.removeEventListener("resize",this.refresh),this.mutationsObserver_&&this.mutationsObserver_.disconnect(),this.mutationEventsAdded_&&document.removeEventListener("DOMSubtreeModified",this.refresh),this.mutationsObserver_=null,this.mutationEventsAdded_=!1,this.connected_=!1)},t.prototype.onTransitionEnd_=function(t){var e=t.propertyName,n=void 0===e?"":e;i.some((function(t){return!!~n.indexOf(t)}))&&this.refresh()},t.getInstance=function(){return this.instance_||(this.instance_=new t),this.instance_},t.instance_=null,t}(),a=function(t,e){for(var n=0,r=Object.keys(e);n0},e}(),y="undefined"!=typeof WeakMap?new WeakMap:new t,g=function t(e){if(!(this instanceof t))throw new TypeError("Cannot call a class as a function.");if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");var n=s.getInstance(),r=new m(e,n,this);y.set(this,r)};["observe","unobserve","disconnect"].forEach((function(t){g.prototype[t]=function(){var e;return(e=y.get(this))[t].apply(e,arguments)}}));var w=void 0!==n.ResizeObserver?n.ResizeObserver:g;export{w as default};