SSR: ResizeObserver is not defined

[schulzi66]

When serving an angular application with SSR, the directive breaks the application, due to the following error:
ReferenceError: ResizeObserver is not defined

It seems that the error occours in the constructor of the directive.

[schulzi66]

A solution would be to use the isPlatformServer() from @angular/common to check if the application is running in SSR and if so, not initialize the ResizeObserver

[cotz1995]

I'm also experiencing this issue when using prerendering.

It looks like this is solved in #62

EDIT: added link to solution PR