Tooltip Directive Angular2

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

@Directive({
  selector: '[tooltip]',
  host: {
    '(mouseenter)': 'show($event)'
  }
})
export class Tooltip {
  constructor(element: ElementRef){
    console.log(element);//.nativeElement.getBoundingClientRect());
  }

  @Input('tooltip') text: string;

  show(event) {
    console.log(event);
  }
}