todo-list.component.ts

import { Component, OnInit } from '@angular/core';
import { NgbModal } from '@ng-bootstrap/ng-bootstrap';

@Component({
  selector: 'app-todo-list',
  templateUrl: './todo-list.component.html',
  styleUrls: ['./todo-list.component.css']
})
export class TodoListComponent implements OnInit {

  constructor(private modalService: NgbModal) { }

  ngOnInit() {}

  clickAddTodo() {
    alert('hola!');
  }
}