Code to update file Sizer.ts

import {Directive, Component, ElementRef, Renderer, Input} from '@angular/core'
      @Directive({
           selector: '[sizer]'
            	})
            export class Sizer {
               @Input() sizer: string;
               element: ElementRef;
               renderer: Renderer;
 	   constructor(element: ElementRef, renderer: Renderer)
						{
                this.element = element;
                 this.renderer = renderer;
                                }
                ngOnInit(){     this.renderer.setElementStyle(this.element, 'font-size', this.sizer + "%");
						}
				}