Angular 5 - Meta description not working

I got a problem with the Meta function of Angular.

import {Meta} from '@angular/platform-browser';
​

I have added it on my page "contact.component.ts" but I'm not seeing anything on my web page. There is no meta description or something else.

This is my page code:

import {Meta} from '@angular/platform-browser';


@Component({
selector: 'app-contact',
templateUrl: './contact.component.html',
providers: [],
styleUrls: ['contact.component.css']
})

export class ContactComponent implements OnInit {

constructor(public meta: Meta, public http: Http, public router: Router, public RequestService: RequestService, public global: GlobalService) {
this.meta.addTag({ name: 'description', content: 'This is metadata' });
}

ngOnInit() {
this.global.redirectionIfNoConnecte();
this.global.getJsonLanguage();
}

}


Can you save me ?

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