Property 'json' does not exist on type '{}'

Question

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

import {Http, Headers, Response} from \'angular2/http\'; 
export abstract class SomeService         


        

Answer 1

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

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

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.

Answer 2

To me this looks strange...

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

I would do

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