Universal @ Firebase Cloud Functions: TypeError: ctor is not a constructor

MockAppModule.ts

import { MockAppComponent } from './mock-app.component';
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { SharedModule } from '../../shared/shared.module';
import { AuthService } from '../../models/auth/auth.service';
import { PromptService } from '../../components/prompt/prompt.service';
import { BaseModelService } from '../../models/base-model.service';
import { CookieService } from 'ng2-cookies';
import { ChartService } from '../../models/chart-data/chart.service';
import { RolesService } from '../../models/auth/roles.service';
import { ForumsService } from '../../models/forums/forums.service';
import { HeadToucherService } from '../../services/head-toucher.service';
import { ResponsiveService } from '../../services/responsive.service';
import { ScrollAreaService } from '../../components/scroll-area/scroll-area.service';
import { AngularFireModule } from 'angularfire2';
import { environment } from '../../../environments/environment';
import { AngularFireDatabaseModule } from 'angularfire2/database';
import { AngularFireAuthModule } from 'angularfire2/auth';
import { FileUploadModule } from 'ng2-file-upload';

@NgModule({
    imports: [
        BrowserModule.withServerTransition({ appId: 'universal' }),
        SharedModule,
        AngularFireModule.initializeApp(environment.firebase),
        AngularFireDatabaseModule, // Causes "ctor is not a constructor"
        AngularFireAuthModule, // Causes "ctor is not a constructor"
        FileUploadModule
    ],
    declarations: [
        MockAppComponent,
    ],
    entryComponents: [
    ],
    exports: [
    ],
    providers: [
        AuthService,
        PromptService,
        BaseModelService,
        CookieService,
        ChartService,
        RolesService,
        ForumsService,
        HeadToucherService,
        ResponsiveService,
        ScrollAreaService
    ],
    bootstrap: [MockAppComponent]
})
export class MockAppModule {
}