app-button.ts

import { Component, ChangeDetectionStrategy, Input, Output, EventEmitter } from '@angular/core';
 
@Component({
  selector: 'app-button',
  templateUrl: './button.component.html',
  styleUrls: ['./button.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class ButtonComponent {
  @Input()
  public color: string = null;
 
  @Input()
  public shouldEmit = false;
 
  @Output()
  public click = new EventEmitter<void>();
 
  public onClick(): void {
    if (this.shouldEmit) { // This is just a rough example
      this.click.emit();
    }
  }
}