var _=function(){if(typeof Map<"u")return Map;function e(t,n){var r=-1;return t.some(function(i,o){return i[0]===n?(r=o,!0):!1}),r}return function(){function t(){this.__entries__=[]}return Object.defineProperty(t.prototype,"size",{get:function(){return this.__entries__.length},enumerable:!0,configurable:!0}),t.prototype.get=function(n){var r=e(this.__entries__,n),i=this.__entries__[r];return i&&i[1]},t.prototype.set=function(n,r){var i=e(this.__entries__,n);~i?this.__entries__[i][1]=r:this.__entries__.push([n,r])},t.prototype.delete=function(n){var r=this.__entries__,i=e(r,n);~i&&r.splice(i,1)},t.prototype.has=function(n){return!!~e(this.__entries__,n)},t.prototype.clear=function(){this.__entries__.splice(0)},t.prototype.forEach=function(n,r){r===void 0&&(r=null);for(var i=0,o=this.__entries__;i0},e.prototype.connect_=function(){!v||this.connected_||(document.addEventListener("transitionend",this.onTransitionEnd_),window.addEventListener("resize",this.refresh),A?(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)},e.prototype.disconnect_=function(){!v||!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)},e.prototype.onTransitionEnd_=function(t){var n=t.propertyName,r=n===void 0?"":n,i=x.some(function(o){return!!~r.indexOf(o)});i&&this.refresh()},e.getInstance=function(){return this.instance_||(this.instance_=new e),this.instance_},e.instance_=null,e}(),m=function(e,t){for(var n=0,r=Object.keys(t);n"u"||!(Element instanceof Object))){if(!(t instanceof c(t).Element))throw new TypeError('parameter 1 is not of type "Element".');var n=this.observations_;n.has(t)||(n.set(t,new W(t)),this.controller_.addObserver(this),this.controller_.refresh())}},e.prototype.unobserve=function(t){if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");if(!(typeof Element>"u"||!(Element instanceof Object))){if(!(t instanceof c(t).Element))throw new TypeError('parameter 1 is not of type "Element".');var n=this.observations_;n.has(t)&&(n.delete(t),n.size||this.controller_.removeObserver(this))}},e.prototype.disconnect=function(){this.clearActive(),this.observations_.clear(),this.controller_.removeObserver(this)},e.prototype.gatherActive=function(){var t=this;this.clearActive(),this.observations_.forEach(function(n){n.isActive()&&t.activeObservations_.push(n)})},e.prototype.broadcastActive=function(){if(this.hasActive()){var t=this.callbackCtx_,n=this.activeObservations_.map(function(r){return new j(r.target,r.broadcastRect())});this.callback_.call(t,n,t),this.clearActive()}},e.prototype.clearActive=function(){this.activeObservations_.splice(0)},e.prototype.hasActive=function(){return this.activeObservations_.length>0},e}(),g=typeof WeakMap<"u"?new WeakMap:new _,w=function(){function e(t){if(!(this instanceof e))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=z.getInstance(),r=new F(t,n,this);g.set(this,r)}return e}();["observe","unobserve","disconnect"].forEach(function(e){w.prototype[e]=function(){var t;return(t=g.get(this))[e].apply(t,arguments)}});var H=function(){return typeof f.ResizeObserver<"u"?f.ResizeObserver:w}();export{H as i};