Tips for specifying a custom type as the return value of a function and denote it as a promise

I encountered this code snippet:

import * as Promise from 'bluebird';
import {Response} from '../commonInterfaces/httpService';

getCall(url: string, accessToken: string, extraHeaders: object): Promise<Response> {
    let headers = this.getHeaders(accessToken, extraHeaders);
      return new Promise((resolve, reject) => {
        request({
            url: url,
            method: "GET",
            withCredentials: false,
            json: true,
            headers: headers
        }, (err: Error, response: Response) => {
             if (err) {
                reject(err)
             } else {
                 resolve(response)
           }
        });
     });
}

and Response is defined as an interface:

interface Response {statusCode: number, body: object}

This leads to the error message:

[ts]
Type 'Bluebird<{}>' is not assignable to type 'Bluebird<Response>'.
Type '{}' is not assignable to type 'Response'.
Property 'statusCode' is missing in type '{}'.

What could possibly be causing this issue?

Answer №1

It appears that the compiler is not able to deduce the type from calling resolve(response).
You can provide guidance by specifying the generic constraint manually:

return new Promise<Response>((resolve, reject) => { ... });

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