Walgermo

import { Injectable } from '@angular/core';
import { Title } from '@angular/platform-browser';
import { Router, NavigationEnd, ActivatedRoute } from '@angular/router';
import { filter, map, mergeMap } from 'rxjs/operators';

/**
 *  Call updateTitle() from app.component.ts contructor.
 *  Example app.component.ts:
    constructor(private meta: MetaService) {
        this.meta.updateTitle();