Use spread syntax

Author: danielwerg

src/fetch.ts

@@ -5,23 +5,25 @@ import { ubiAppId } from './auth';
 const promiseTimeout = <T>(promise: Promise<T>, ms: number, reject = true) =>
   Promise.race([promise, new Promise((res, rej) => setTimeout(() => reject ? rej : res, ms))]);
 
-export default <T>(url: string, params: Partial<RequestInit> = {}) =>
+export default <T>(url: string, options: Partial<RequestInit> = {}) =>
   async (token?: string): Promise<T> => {
 
+    const { headers, ...optionsRest } = options;
+
     const response = await nodeFetch(
       url,
-      Object.assign(
-        {},
-        {
+      {
+        ...{
           method: 'GET',
           headers: {
             'Content-Type': 'application/json; charset=UTF-8',
             'Ubi-AppId': ubiAppId,
-            'Authorization': token
+            ...token && { 'Authorization': token },
+            ...headers && { ...headers }
           }
         },
-        params || {}
-      )
+        ...optionsRest && { ...optionsRest }
+      }
     );
 
     const handleResponse = async (res: Response) => {