Encountering a typescript error while configuring options in an Angular 8 application

When attempting to call a service using REST API with a GET request, I encountered the following error:

Argument of type '{ headers: HttpHeaders; responseType: string; }' is not assignable to parameter of type '{ headers?: HttpHeaders | { [header: string]: string | string[]; }; observe?: "body"; params?: HttpParams | { [param: string]: string | string[]; }; reportProgress?: boolean; responseType?: "json"; withCredentials?: boolean; }'. Types of property 'responseType' are incompatible. Type 'string' is not assignable to type '"json"'.ts(2345)

 const httpOptionsText = {
  headers: new HttpHeaders({
    'Accept': 'text/plain',
    'Content-Type': 'text/plain'
  }),
  responseType: 'text'
};

Below is the code snippet where the httpOptionsPlain is causing the error in the service call.

@Injectable()
export class TripService {

public getTripNameById(tripId: number): Observable<any> {
    return this.http.get<any>(`${this.baseUrl}/Trips/Trip/Name/${tripId}`,  httpOptionsText);
  }

The error message only appears in the editor (the code functions properly). Thank you.

Answer №1

To enhance your code performance, consider revising it to

public retrieveTripNameById(tripIdentifier: number): Observable<any> {
const httpConfiguration = {
headers: new HttpHeaders({
Accept: "text/plain",
"Content-Type": "text/plain"
}),
responseType: "text" as "json"
};
return this.http.get<any>(
`${this.baseUrl}/Trips/Trip/Name/${tripIdentifier}`,
httpConfiguration
);
}

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