angular-cn/public/docs/_examples/ngmodule/ts/app/highlight.directive.ts

// #docregion
import { Directive, ElementRef } from '@angular/core';

@Directive({ selector: '[highlight]' })
/** Highlight the attached element in gold */
export class HighlightDirective {
  constructor(el: ElementRef) {
    el.nativeElement.style.backgroundColor = 'gold';
    console.log(
      `* AppRoot highlight called for ${el.nativeElement.tagName}`);
  }
}