Ionic refresher

Ionic Framework ionic-v3
1

Good evening,

I have a question about refreshing data which is loaded from an external json file. My script is this for now and at the doRefresh part I have to change something but dont know how

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { HttpClient } from '@angular/common/http';
import "rxjs/add/operator/map";
 
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  users=[];
  page = 0;
  maximumPages = 10;
	
	text:any = {
    Year: 'Year',
    Month: 'Month',
    Weeks: "Weeks",
    Days: "Days",
    Hours: "Hours",
    Minutes: "Minutes",
    Seconds: "Seconds",
    MilliSeconds: "MilliSeconds"
  };
 
  constructor(public navCtrl: NavController, private httpClient: HttpClient) {
    this.loadUsers();
  }
 
  
	loadUsers(infiniteScroll?) {
 
    this.httpClient.get(`http://bla.nl/res/nieuws?page=${this.page}`)
    .subscribe(res => {
      this.users = this.users.concat(res['results']);
      if (infiniteScroll) {
        infiniteScroll.complete();
      }
    })
 
        
     

  }
 
  loadMore(infiniteScroll) {
    this.page++;
    this.loadUsers(infiniteScroll);
 
    if (this.page === this.maximumPages) {
      infiniteScroll.enable(false);
    }
  }
	
	doRefresh(refresher) {
    console.log('Begin async operation', refresher);
		
		.subscribe(res => {
      this.users = this.users.concat(res['results']);
		});
}
 
}

For now I get Declaration or statement expected. How can I add something before .subscribe which can work?