title: Pass variable to module using forRoot
body: <p>I've developed a library with shared components in Angular and I want to pass configuration there.</p>
  
  <p>Everything is basically the same as in:
  <a href="https://stackoverflow.com/questions/43292628/pass-config-data-using-forroot">Pass config data using forRoot</a></p>
  
  <p>Problem is, that I need to pass user to this module, which is fetched on start of application and saved in Redux state.</p>
  
  <p>Is it possible to pass observable with user using forRoot while importing module? Maybe it's possible to pass something to this module 'later' with some lazy loading?</p>
  
  <pre><code>@select() private user$: Observable&lt;User&gt;
  
  @NgModule({
    imports: [
      LibModule.forRoot({
        user: user$
      })
  ...
  })
  </code></pre>