import { NgModule, ModuleWithProviders } from '@angular/core'; import { OptionProtocolService } from './services/option-protocol.service'; const SERVICES = [OptionProtocolService]; @NgModule({ declarations: [], imports: [], exports: [] }) export class UCapOptionProtocolModule { public static forRoot(): ModuleWithProviders { return { ngModule: UCapOptionProtocolModule, providers: [...SERVICES] }; } }