Property 'checked' does not exist on type 'HTMLElement' angular 4

Use this:

const ele = document.getElementById("idOfElement") as HTMLInputElement;
ele.checked = false;

In your HTML

<input #abcde  type="checkbox" (change)="func()" />

In your component

import { Component, ViewChild, ElementRef } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
  @ViewChild('abcde') abcde: ElementRef;
  func() {
    this.abcde.nativeElement.checked
  }
}