import { NgForm } from '@angular/forms';
import { DatePipe } from '@angular/common';
import { HttpClient, HttpHeaders } from '@angular/common/http';

@Component({
  selector: 'plugin-a-component',
  templateUrl: './plugin-a.component.html'
})
export class PluginAComponent {
  public myForm: NgForm;

  constructor(private datePipe: DatePipe) { }
}

ERROR Error: Uncaught (in promise): Error: StaticInjectorError(AppModule)[PluginAComponent -> DatePipe]:
  StaticInjectorError(Platform: core)[PluginAComponent -> DatePipe]:
    NullInjectorError: No provider for DatePipe!
Error: StaticInjectorError(AppModule)[PluginAComponent -> DatePipe]:
  StaticInjectorError(Platform: core)[PluginAComponent -> DatePipe]:
    NullInjectorError: No provider for DatePipe!