Attribute directives in Angular 2

color.directive.ts

//Directive is imported to provide the functionality of @Directive decorator
import { Directive, ElementRef } from '@angular/core'

@Directive({ selector: '[colorMe]'})
export class ColorDirective {
  //ElementRef is used to access the DOM element 
  constructor(private el: ElementRef) { 
    el.nativeElement.style.color = 'red';
  }
}