属性“JSON”的类型不存在“{}” [英] Property 'json' does not exist on type '{}'

问题描述

我在打字稿的抽象基类，看起来像这样：

I have an abstract base class in Typescript that looks like this:

import {Http, Headers, Response} from 'angular2/http'; 
export abstract class SomeService {
    constructor(private http:Http) {}   

    protected post(path:string, data:Object) {
        let stringifiedData = JSON.stringify(data);
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');
        headers.append('Accept', 'application/json');

        this.http.post(`http://api.example.com/${path}`, stringifiedData, { headers })
            .map(res => res.json())
            .subscribe(obj => console.log(obj));
    }
}

它完美。然而，打字稿编译器抱怨 .MAP（RES =＆GT; res.json（））。我不断收到此错误：

ERROR in ./src/app/components/shared/something/some.abstract.service.ts
(13,29): error TS2339: Property 'json' does not exist on type '{}'.

我跟着角2文档和它的工作原理的。我只是在生病这个错误盯着。我缺少的东西吗？

I followed the examples in the angular 2 documentation, and it works. I'm just sick of staring at this error. Am I missing something?

推荐答案

您可以摆脱这个错误被类型断言为响应：

You can get rid of this error by type-assertion to Response:

.map(res => (<Response>res).json())

http.post（）将返回观测与LT;响应＆GT; 上至极地图将需要类型的对象响应。我认为这是在当前的打字稿AngularJS缺少定义 .d.ts 。

http.post() will return a Observable<Response> on wich map will require an Object of type Response. I think that's a missing definition in the current TypeScript AngularJS .d.ts.

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