Cleaned code

src/app/services/api/api.module.ts

@@ -1,30 +1,30 @@
-import { NgModule, ModuleWithProviders, SkipSelf, Optional } from '@angular/core';
-import { Configuration } from './configuration';
-import { HttpClient } from '@angular/common/http';
+import {NgModule, ModuleWithProviders, SkipSelf, Optional} from '@angular/core';
+import {Configuration} from './configuration';
+import {HttpClient} from '@angular/common/http';
 
 
 @NgModule({
-  imports:      [],
-  declarations: [],
-  exports:      [],
-  providers: []
+    imports: [],
+    declarations: [],
+    exports: [],
+    providers: []
 })
 export class ApiModule {
     public static forRoot(configurationFactory: () => Configuration): ModuleWithProviders<ApiModule> {
         return {
             ngModule: ApiModule,
-            providers: [ { provide: Configuration, useFactory: configurationFactory } ]
+            providers: [{provide: Configuration, useFactory: configurationFactory}]
         };
     }
 
-    constructor( @Optional() @SkipSelf() parentModule: ApiModule,
-                 @Optional() http: HttpClient) {
+    constructor(@Optional() @SkipSelf() parentModule: ApiModule,
+                @Optional() http: HttpClient) {
         if (parentModule) {
             throw new Error('ApiModule is already loaded. Import in your base AppModule only.');
         }
         if (!http) {
             throw new Error('You need to import the HttpClientModule in your AppModule! \n' +
-            'See also https://github.com/angular/angular/issues/20575');
+                'See also https://github.com/angular/angular/issues/20575');
         }
     }
 }