Troubleshooting the NullInjectorError in Angular - Service Provider Missing?

I'm facing an issue in my code where I have buttons that should trigger pop-ups displaying details as a list when clicked. However, every time I click the buttons, I encounter the error mentioned below. It seems like I am unable to access the desired property. Can you help me identify what might be wrong with my code and suggest a way to fix it?

TS Code:

@Component({
  selector: 'warehouse-detail-dialog',
  templateUrl: './warehouse-detail-dialog.component.html',
  styleUrls: ['./warehouse-detail-dialog.component.scss']
})
export class WarehouseDetailDialogComponent implements OnInit {

  cell: ICell;
  userRights: IActionRoleMap;

  displayedColumns: string[] = [
    'EntryPackageBarcode',
    'StockIntegrationCode',
    'ProductName',
    'Balance',
];
dataSource: MatTableDataSource<IStockPackageTransaction>;

@ViewChild(MatPaginator, { static: true }) paginator: MatPaginator;
@ViewChild(MatSort, { static: true }) sort: MatSort;


constructor(
      private _terminalService: TerminalService,
      private _router: Router
  ) {

    _terminalService.onCellDetailChanged.subscribe((response: ICell) => {
      this.cell = response;
      
      this.dataSource = new MatTableDataSource(response.StockPackageTransactions);
      this.dataSource.paginator = this.paginator;
      this.dataSource.sort = this.sort;

  });

     
  }

TS for Service:

cellDetail: ICell;
    onCellDetailChanged: BehaviorSubject<any> = new BehaviorSubject([]);
 getCellDetailById(id: string) {
        return new Promise((resolve, reject) => {
            this._http
                .get("Production/GetCellDetailById/" + id)
                .subscribe((response: ICell) => {
                    this.cellDetail = response;
                    this.onCellDetailChanged.next(this.cellDetail);
                    resolve(this.cellDetail);
                }, reject);
        });
    }

Error:

WarehouseDetailDialogComponent_Host.ngfactory.js? [sm]:1 ERROR NullInjectorError: StaticInjectorError(AppModule)[WarehouseDetailDialogComponent -> TerminalService]: 
  StaticInjectorError(Platform: core)[WarehouseDetailDialogComponent -> TerminalService]: 
    NullInjectorError: No provider for TerminalService!
    at NullInjector.get (core.js:778)
    at resolveToken (core.js:2564)
    at tryResolveToken (core.js:2490)
    at StaticInjector.get (core.js:2353)
    at resolveToken (core.js:2564)
    at tryResolveToken (core.js:2490)
    at StaticInjector.get (core.js:2353)
    at resolveNgModuleDep (core.js:26403)
    at NgModuleRef_.get (core.js:27491)
    at resolveNgModuleDep (core.js:26403)

Answer â„–1

Make sure to include TerminalService in the providers: [] array within the main module file (most likely app.module.ts). The error message is indicating that there is no provider for TerminalService!

Answer â„–2

One effective solution is to include it in the providers array within the root module, however, utilizing the providedIn pattern is highly recommended for a key reason: tree-shaking. By providing your services using

@Injectable({
  providedIn: 'root'
})

if they are not used, they will be removed during the tree-shaking process, resulting in a smaller bundle size.

Reference: https://angular.io/guide/providers#providedin-and-ngmodules

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