fix(platform): remove ES2015 import cycles

closes #42

projects/scion/microfrontend-platform/src/lib/host/activator/activator-installer.ts

@@ -19,9 +19,9 @@ import { Logger } from '../../logger';
 import { PlatformMessageClient } from '../platform-message-client';
 import { MessageHeaders } from '../../messaging.model';
 import { EMPTY } from 'rxjs';
-import { MicrofrontendPlatform } from '../../microfrontend-platform';
 import { PlatformState } from '../../platform-state';
 import { Beans, Initializer } from '@scion/toolkit/bean-manager';
+import { PlatformStateRef } from '../../platform-state-ref';
 
 /**
  * Activates micro applications which provide an activator capability.
@@ -119,7 +119,7 @@ export class ActivatorInstaller implements Initializer {
     // Add the router outlet to the DOM
     document.body.appendChild(routerOutlet);
     // Unmount the router outlet on platform shutdown
-    MicrofrontendPlatform.whenState(PlatformState.Stopped).then(() => document.body.removeChild(routerOutlet));
+    Beans.get(PlatformStateRef).whenState(PlatformState.Stopped).then(() => document.body.removeChild(routerOutlet));
   }
 }
 

projects/scion/microfrontend-platform/src/lib/logger.ts

@@ -38,7 +38,6 @@ export abstract class Logger {
  *
  * Replace this bean to capture the log output.
  *
- * @ignore
  * @internal
  */
 export class ConsoleLogger implements Logger {

projects/scion/microfrontend-platform/src/lib/microfrontend-platform.ts

@@ -49,6 +49,7 @@ import { PlatformState, Runlevel } from './platform-state';
 import { AbstractType, BeanInstanceConstructInstructions, Beans, Type } from '@scion/toolkit/bean-manager';
 import { ɵIntentClient } from './client/messaging/ɵintent-client';
 import { ɵMessageClient } from './client/messaging/ɵmessage-client';
+import { PlatformStateRef } from './platform-state-ref';
 
 window.addEventListener('beforeunload', () => MicrofrontendPlatform.destroy(), {once: true});
 
@@ -102,7 +103,7 @@ window.addEventListener('beforeunload', () => MicrofrontendPlatform.destroy(), {
  *
  * @category Platform
  */
-// @dynamic `ng-packagr` does not support lamdas in statics if `strictMetaDataEmit` is enabled. `ng-packagr` is used to build this library. See https://github.com/ng-packagr/ng-packagr/issues/696#issuecomment-373487183.
+// @dynamic `ng-packagr` does not support lambdas in statics if `strictMetaDataEmit` is enabled. `ng-packagr` is used to build this library. See https://github.com/ng-packagr/ng-packagr/issues/696#issuecomment-373487183.
 export class MicrofrontendPlatform {
 
   private static _state$ = new BehaviorSubject<PlatformState>(PlatformState.Stopped);
@@ -181,6 +182,7 @@ export class MicrofrontendPlatform {
         Beans.registerIfAbsent(OutletRouter);
         Beans.registerIfAbsent(RelativePathResolver);
         Beans.registerIfAbsent(RouterOutletUrlAssigner);
+        Beans.register(PlatformStateRef, {useValue: MicrofrontendPlatform});
 
         Beans.register(ɵPlatformBrokerGatewaySymbol, provideBrokerGateway(PLATFORM_SYMBOLIC_NAME, hostAppConfig && hostAppConfig.messaging));
         Beans.registerIfAbsent(PlatformMessageClient, provideMessageClient(ɵPlatformBrokerGatewaySymbol));
@@ -266,6 +268,7 @@ export class MicrofrontendPlatform {
         Beans.register(ContextService);
         Beans.register(ManifestService);
         Beans.register(KeyboardEventDispatcher, {eager: true});
+        Beans.register(PlatformStateRef, {useValue: MicrofrontendPlatform});
       },
     );
   }

projects/scion/microfrontend-platform/src/lib/platform-state-ref.ts

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018-2020 Swiss Federal Railways
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
+import { PlatformState } from './platform-state';
+
+/**
+ * Provides access to the platform state.
+ *
+ * Use this bean from within a class which is itself referenced in the MicrofrontendPlatform, in order to avoid ES2015 import cycles.
+ *
+ * @see {@link ActivatorInstaller} for an example.
+ * @ignore
+ */
+export abstract class PlatformStateRef {
+
+  public abstract whenState(state: PlatformState): Promise<void>;
+}