Setting button label to member's name

[J.D]

 function myGetCurrentMemberFunction(options) {
return currentMember.getMember(options)
   .then((member) => {
      if (member) {
         var firstName = member.contactDetails.firstName;
         $w('#logIn').label = "hi " + firstName;
      }
      else {
         $w('#logIn').label = "login";
      }
      return member;
   })
   .catch((error) => {
   console.error(error);
   })
}