seo service for angular2

seo-meta-data.ts

export class SeoMetaData{
  title: string;
  description:string;
}

seo.service.ts

import { Injectable, Inject } from '@angular/core';
import {  DOCUMENT } from '@angular/platform-browser';
import { SeoMetaData } from "seo-meta-data";
@Injectable()
export class SEOService {
    constructor( @Inject(DOCUMENT) private document: any)  {}
    public setData(metaData: SeoMetaData): void {
        this.setMeta(metaData.title,metaData.description);
    }
    private setMeta(title: string = '', description: string = '') {
        this.setTitle(title);
        this.setMetaDescription(description);  
    }

    private setTitle(title: string) {
        this.document.title = title;
    }

    private setMetaDescription(description: string) {
        let headChildren = this.document.head.children;
        for (let i = 0; i < headChildren.length; i++) {
            let element = headChildren[i];

            if(element.name === 'meta' && element.attribs.name === 'description'){
                element.attribs.content = description;
            }
        }
    }
}