angular-library-starter | Minimalist Starter for Angular libraries

I poorly read the GitHub Issue. Apparently when working with local libraries you have to add --preserve-symlinks argument to ng serve.

I believe this is a build process responsibility.

Seems you're right. We usually inline template during the build process.

In order to do you can create js file like:

/utils/inline-resouces.js

If this is a library or a module that will be imported into other libraries/modules you SHOULD NOT call the .forRoot() function when you pass it into the @NgModule.

RouterModule declares and exports some directives, e.g. router-outlet, routerLink, routerLinkActive etc. Also, it provides some services e.g. Router, ActivatedRoute etc. To avoid having multiple instances of services, RouterModule defines two methods, "forRoot" and "forChild". As the name suggests, "forRoot" method should be called only by root module, i.e. app.module, and forChild should be called by other feature modules. This way, you still get to use directives, components, pipes exported by this module and don't get new instances of services.

While this doesn't specifically get the root of your issue, it will likely resolve your issue. (Also this issue may help)