RxJS operators used by ui-router are missing when built using angular-cli AoT

[christopherthielen]

If you don't explicitly import all the RxJS operators that UI-Router requires (primarily for the UISref directive) they seem to get tree-shaked away when running in AoT (--aot) and/or production build (--prod).

UI-Router imports the operators in the index file:

import "rxjs/Observable";
import "rxjs/ReplaySubject";
import "rxjs/BehaviorSubject";
import "rxjs/Subscription";
import 'rxjs/add/observable/of';
import 'rxjs/add/observable/combineLatest';
import 'rxjs/add/observable/fromPromise';
import 'rxjs/add/operator/switchMap';
import 'rxjs/add/operator/mergeMap';
import 'rxjs/add/operator/concat';
import 'rxjs/add/operator/map';

but they seem to get stripped away (likely due to webpack tree shaking) and cause an exception at runtime

TypeError: this._globals.start$.switchMap is not a function
    at UISrefStatus.ngAfterContentInit (vendor.bundle.js:13026)
    at View_ContactListComponent1.webpackJsonp.762.View_ContactListComponent1.detectChangesInternal (1.chunk.js:1074)
    at View_ContactListComponent1.AppView.detectChanges (vendor.bundle.js:7364)
    at ViewContainer.detectChangesInNestedViews (vendor.bundle.js:10602)
    at View_ContactListComponent0.webpackJsonp.762.View_ContactListComponent0.detectChangesInternal (1.chunk.js:1188)
    at View_ContactListComponent0.AppView.detectChanges (vendor.bundle.js:7364)
    at View_ContactListComponent0.AppView.internalDetectChanges (vendor.bundle.js:7349)
    at View_ContactsComponent0.webpackJsonp.764.View_ContactsComponent0.detectChangesInternal (1.chunk.js:1645)
    at View_ContactsComponent0.AppView.detectChanges (vendor.bundle.js:7364)
    at View_ContactsComponent0.AppView.internalDetectChanges (vendor.bundle.js:7349)
    at View_ContactsComponent_Host0.webpackJsonp.764.View_ContactsComponent_Host0.detectChangesInternal (1.chunk.js:1573)
    at View_ContactsComponent_Host0.AppView.detectChanges (vendor.bundle.js:7364)
    at ViewRef_.detectChanges (vendor.bundle.js:36485)
    at UIView.applyInputBindings (vendor.bundle.js:8271)
    at UIView.applyUpdatedConfig (vendor.bundle.js:8229)

I'm not sure what best practice is regarding these imports, but it seems to work if the imports are moved into each file that requires the operator.

Related to: #28

[aitboudad]

see #48