Module 281969

function(e,t,i){i.d(t,{A:()=>l});class n{visibility=new Map;listeners=new Set;isFramePooled(e){return this.visibility.has(e)}isFrameVisible(e){return!1!==this.visibility.get(e)}subscribe(e){return this.listeners.add(e),()=>{this.listeners.delete(e)}}setFrameVisible(e,t){this.visibility.get(e)!==t&&(this.visibility.set(e,t),this.emit())}removeFrame(e){this.visibility.delete(e)&&this.emit()}emit(){for(let e of this.listeners)e()}}let l=new n}