Avoid tslint warnings (All imports are unused)

Hello Experts

Given:
- IONIC 3
- ionic serve works perfectly.
- the console shows
[13:12:53] tslint: src/pages/login/login.ts, line: 2
All imports are unused.

   L1:  import { Component } from '@angular/core';
   L2:  import { NgForm } from '@angular/forms';

Required
- Avoid tslint warnings

I would appreciate any help.

Regards
Mahmoud