当我在angular7中将http升级为httpClient时，rxjs映射出现错误

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    HttpClientModule
  ],
  ...
})
export class AppModule { }

import { HttpClient } from '@angular/common/http';
import { map } from 'rxjs/operators';

@Injectable()
export class YourService {
  constructor(private http: HttpClient) { }

  getData() {
    return this.http.get('your-api-url').pipe(
      map(response => {
        // 在这里进行映射操作
        return response;
      })
    );
  }
}