How can I conditionally use either [href] or [routerLink] on an anchor?

I need for the same anchor link to be pointed conditionally locally or to external resource. I tried

<a [href]="outside?externalUrl:null" [routerLink]="outside?[]:['/route',id]" >test</a>


But it doesn't work. I don't get any errors, but it points to the same local page and ignores the external URL. Any ideas?

Another option would be to construct the link, but I can't find any docs how to access routerLink inside a service

Edit: I know I can clone the whole link with *ngIf but I don't want to do it, my link contains a video tag with a buch of options

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