analytics_set_user_property.js

import * as firebase from "nativescript-plugin-firebase";
setUserProperty({ key, value }) {
  firebase.analytics
    .setUserProperty({
      key: key,
      value: value,
    })
    .then(
      () => {
        console.log("Analytics user property set");
      },
      (error) => {
        console.log(`Analytics user property set error ${error}`);
      }
    );
},
setUserId(userId){
  firebase.analytics.setUserId({
    userId: "userId"
  }).then(
      function () {
        console.log("Analytics userId set");
      }
  );
}