This error started to pop up after I migrated to TS 2.2.2, so I&#39;m assuming that&#39;s the problem... The code did not stop working, but now I receive that error and I tried a few things like returning an empty observable, catching the re-thrown exception and returning an object, nothing seemed to work. Why is this happening now? Shouldn&#39;t it understand I&#39;m re-throwing the exception and not expect a return? Am I misreading the error?

This is the complete error description:


[![enter image description here][1]][1]

Here&#39;s the complete code:

    return request
        .map((res: Response) =&gt; res.json())
        .catch((error: any) =&gt; {
            // todo: log?
    
            if (error.status == 500) {
                this.alertService.showError(error.statusText);
            } else if (error.status == 588) {
                this.alertService.showAlert(error.statusText);
            }
    
            Observable.throw(error.statusText);
        });

I tried returning the Observable, but my wrapper method expects a return of type `T`, which is the return of my deserialized request (`map(...)`). If I do return the `throw` this is the error I get:

&gt; [ts] Type &#39;Observable&lt;any&gt;&#39; is not assignable to type &#39;T&#39;

I&#39;m using:

&gt;  - Angular4
&gt;  - Typescript 2.2.2

  [1]: https://i.stack.imgur.com/ePmFC.jpg

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Type 'void' is not assignable to type 'ObservableInput<{}>'