类型“ Promise <any>”上不存在属性“ data”

Question

当我尝试通过服务和接口从json中获取数据时出现此错误。在Visual Studio代码中，它未显示任何错误，而在编译时则显示错误'属性'数据'在类型上不存在“承诺”

import { ICar } from './ICar';
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { map} from 'rxjs/operators';


@Injectable({
  providedIn: 'root'
})
export class CarsService {

  constructor(private http: HttpClient) {

   }
   getCars(): Observable<ICar[]> {
      return this.http.get('./app/cars.json')
      .pipe(map((resp: Response) => resp.json().data));
   }
}

import { ICar } from '../ICar';
import { CarsService } from '../cars.service';
import { Component, OnInit} from '@angular/core';

@Component({
  // tslint:disable-next-line:component-selector
  selector: 'cars',
  templateUrl: 'app/cars/cars.component.html',
  providers: [CarsService]
})
export class CarsComponent implements OnInit {
  car: ICar[] = null;
  constructor(private carService: CarsService) {
    // this.car = this.carService.getCars();
  }
  ngOnInit() {
    this.carService.getCars().subscribe((carData) => this.car = carData);
  }
}