angular/angularfire2

import { CommonModule } from '@angular/common';
import { HTTP_INTERCEPTORS, HttpClientModule } from '@angular/common/http';
import { APP_INITIALIZER, ModuleWithProviders, NgModule } from '@angular/core';
import { AngularFireAuthModule } from '@angular/fire/auth';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatSnackBarModule } from '@angular/material/snack-bar';
import { RouterModule } from '@angular/router';
import { TranslateModule } from '@ngx-translate/core';

import { AuthInterceptor } from './interceptors/auth.interceptor';
import { ErrorInterceptor } from './interceptors/error.interceptor';
import { LoaderInterceptor } from './interceptors/loader.interceptor';
import { ApiConfig } from './models/api-config.model';
import { AuthGuard } from './service/auth.guard';
import { InitializerService, load } from './service/initializer.service';

/** Http interceptor providers in outside-in order */

const httpInterceptorProviders = [
  { provide: HTTP_INTERCEPTORS, useClass: AuthInterceptor, multi: true },
  { provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },
  { provide: HTTP_INTERCEPTORS, useClass: LoaderInterceptor, multi: true }
];

@NgModule({
  imports: [
    CommonModule,
    HttpClientModule,
    AngularFireAuthModule,
    FormsModule,
    RouterModule,
    ReactiveFormsModule,
    TranslateModule.forRoot({
      isolate: true
    }),
    MatButtonModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatSnackBarModule
  ],
  providers: [
    ApiConfig,
    AuthGuard,
    {
      provide: APP_INITIALIZER,
      useFactory: load,
      deps: [InitializerService],
      multi: true
    },
    httpInterceptorProviders
  ]
})
export class LibCoreModule {
  static forRoot(config: ApiConfig): ModuleWithProviders<LibCoreModule> {
    return {
      ngModule: LibCoreModule,
      providers: [{ provide: ApiConfig, useValue: config }]
    };
  }
  constructor() {}
}