index.ts

import { NgModule, ModuleWithProviders } from '@angular/core';
import { CommonModule } from '@angular/common';
// import { SampleComponent } from './src/sample.component';
// import { SampleDirective } from './src/sample.directive';
// import { SamplePipe } from './src/sample.pipe';
import { SampleService } from './src/sample.service';

// export * from './src/sample.component';
// export * from './src/sample.directive';
// export * from './src/sample.pipe';
export * from './src/sample.service';

@NgModule({
  imports: [
    CommonModule
  ],
  // declarations: [
  //  SampleComponent,
  //  SampleDirective,
  //  SamplePipe
  // ],
  // exports: [
  //  SampleComponent,
  //  SampleDirective,
  //  SamplePipe
  // ]
})
export class SampleModule {
  static forRoot(getConfig: Function): ModuleWithProviders {
    return {
      ngModule: SampleModule,
      providers: [
        { provide: 'config', useFactory: getConfig },
        SampleService
      ]
    };
  }
}