ha_permissions/ui/dashboard/index.js

export default {
    isRendered: false,

    async display(){
        if(!this.isRendered){
            document.getElementById("dashboardLogout").addEventListener("click", ()=>{
                localStorage.setItem("loggedIn", "false");
                openPage("login");
                fetch("/logout", {
                    method: "GET",
                    headers: {"Content-Type": "application/json"}
                });
            });
        }
    }
}