async fetch with types returning full response

http.ts

interface IHttpResponse<T> extends Response {
  parsedBody?: T;
}
export const http = <T>(request: RequestInfo): Promise<IHttpResponse<T>> => {
  let response: IHttpResponse<T>;
  return new Promise(resolve => {
    fetch(request)
      .then(res => {
        response = res;
        return res.json();
      })
      .then(body => {
        response.parsedBody = body;
        resolve(response);
      });
  });
};

// example consuming code 
interface ITodo {
  userId: number;
  id: number;
  title: string;
  completed: boolean;
}
  
const response = await http<ITodo[]>(
  "https://jsonplaceholder.typicode.com/todos"
);