fix(effects): add action creator for root effects init action (#2219)

Closes #2218

Author: maxisam

modules/effects/src/effects_root_module.ts

@@ -1,5 +1,6 @@
 import { NgModule, Inject, Optional } from '@angular/core';
 import {
+  createAction,
   StoreModule,
   Store,
   StoreRootModule,
@@ -10,6 +11,7 @@ import { EffectSources } from './effect_sources';
 import { ROOT_EFFECTS, _ROOT_EFFECTS_GUARD } from './tokens';
 
 export const ROOT_EFFECTS_INIT = '@ngrx/effects/init';
+export const rootEffectsInit = createAction(ROOT_EFFECTS_INIT);
 
 @NgModule({})
 export class EffectsRootModule {

modules/effects/src/index.ts

@@ -8,7 +8,10 @@ export { Actions, ofType } from './actions';
 export { EffectsModule } from './effects_module';
 export { EffectSources } from './effect_sources';
 export { EffectNotification } from './effect_notification';
-export { ROOT_EFFECTS_INIT } from './effects_root_module';
+export {
+  ROOT_EFFECTS_INIT,
+  rootEffectsInit,
+} from './effects_root_module';
 export { act } from './act';
 export {
   OnIdentifyEffects,