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error query nativescript plugin firebase | passing result value to out function

See original GitHub issue

hey master… please help me out of this error. i dont know anymore. In method checkDuplicateEmail , i just want to pass value from result function query to local variable hasil. i want to pass the value true or false to var hasil and then i passing the value hasil to my controller. i just run on android platforrm

this is my code

import { Injectable } from "@angular/core";
// firebase API
import * as firebase from "nativescript-plugin-firebase";
// Object
import { ReturnMessage } from "../models/returnMessage";
// Observable
import {BehaviorSubject} from 'rxjs/BehaviorSubject';
import { colorProperty } from "tns-core-modules/ui/editable-text-base/editable-text-base";


@Injectable()
export class AuthService {
    private loggedInState = new BehaviorSubject<boolean>(false);
    currentLoggedInState = this.loggedInState.asObservable();
    constructor (){
    }
    changeStateLoggedIn(){
        if(firebase.getCurrentUser()==null){
          this.loggedInState.next(false);
        }
        else{
          this.loggedInState.next(true);
        }
    }
    checkDuplicateEmail(email:string):boolean{
       var hasil:boolean = false; 
        firebase.query(
            function(result) {
                    console.log("Event type: " + result.type);
                    console.log("Key: " + result.key);
                    console.log("Value: " + JSON.stringify(result.value));
                        if(result.value==null){
                            hasil = true;
                        }
                        else{
                            hasil = false;
                        }
            },
            "/pengguna", 
            {
                singleEvent: true,
                orderBy: {
                    type: firebase.QueryOrderByType.CHILD,
                    value: 'email'
                },
                range: {
                   type: firebase.QueryRangeType.EQUAL_TO,
                   value: email
                }
            }
        ).catch((error)=>{
            hasil=false;
        });
        console.log("hasilvalue = > "+hasil);
        return hasil;
    } 
    signUp(email:string, password:string):ReturnMessage{
        var status = new ReturnMessage();
        firebase.createUser({
            email: email,
            password: password
          }).then( 
              function (result) {
                status.value = true;
                status.message = "User created";
              },
              function (errorMessage) {
                status.value = false;
                status.message = errorMessage;
              }
          );
        return status;
    }

    signIn(email:string, password:string):ReturnMessage{
        var status = new ReturnMessage();
        firebase.login({
            type: firebase.LoginType.PASSWORD,
            passwordOptions: {
              email: email,
              password: password
            }
          }).then(
              function (result) {
                status.value = true;
                status.message = JSON.stringify(result);
                // JSON.stringify(result);
              },
              function (errorMessage) {
                status.value = false;
                status.message = errorMessage;
              }
          );
        return status;
    }
    
    signOut(){
        firebase.logout();
    }

    sendVerifyEmail():ReturnMessage{
        var status = new ReturnMessage();
        firebase.sendEmailVerification().then(
            function () {
              status.value = true;
              status.message = "email verification was sent";
            },
            function (error) {
                status.value = false;
                status.message = error;
            }
        );
        return status;
    }
    
}