fix: whois provider

api/util/http.ts

@@ -1,4 +1,4 @@
-import nodeFetch from 'isomorphic-unfetch';
+import nodeFetch, {Response} from 'node-fetch';
 
 export type HttpMethod =
   | 'GET'
@@ -21,15 +21,18 @@ export interface NowResponse {
   length: number;
 }
 
-export function fetch(url: string, method: HttpMethod = 'HEAD') {
+export function fetch(
+  url: string,
+  method: HttpMethod = 'HEAD',
+): Promise<Response> {
   return nodeFetch(url, {method: method});
 }
 
-export function send(res: NowResponse, data: object) {
+export function send(res: NowResponse, data: object): void {
   res.setHeader('Cache-Control', 's-maxage=86400');
   res.json(data);
 }
 
-export function sendError(res: NowResponse, error: Error) {
+export function sendError(res: NowResponse, error: Error): void {
   res.status(400).json({error: error.message});
 }