属性“错误"在类型“"中不存在|无极" [英] Property 'error' does not exist on type '"" | Promise<any>'

问题描述

我正在尝试按照Angular 指南.

I'm trying to add some error handling to a service, following the Angular guide.

相关代码段:

private handleError (error: Response | any) {
  // In a real world app, you might use a remote logging infrastructure
  let errMsg: string;
  if (error instanceof Response) {
    const body = error.json() || '';
    const err = body.error || JSON.stringify(body);
    errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
  } else {
    errMsg = error.message ? error.message : error.toString();
  }
  console.error(errMsg);
  return Observable.throw(errMsg);
}

但是，我遇到TypeScript错误:

However, I'm getting a TypeScript error:

error TS2339: Property 'error' does not exist on type '"" | Promise<any>'. Property 'error' does not exist on type '""'.

error TS2339: Property 'error' does not exist on type '"" | Promise<any>'. Property 'error' does not exist on type '""'.

我能理解为什么发生的情况-error.json()返回一个Promise<any>，然后随后的body.error行将不起作用，因为没有error属性.但是，似乎应该期望从.json()返回JSON对象.为什么会这样?我想念的不是Angular指南吗?

I can understand why it's happening-- error.json() returns a Promise<any> and then the subsequent line with body.error wouldn't work because there is no error property. However, it seems like it should expect a JSON object to be returned from .json(). Why is that, and what am I missing that the Angular guide isn't?

推荐答案

同一件事刚发生在我身上.当您无法导入Response对象时，就会发生这种情况.

Same thing just happened to me. This happens when you fail to import the Response object.

import { Response } from '@angular/http';

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