Export the users (getCurrentUser) method as part of an object so that…

… we can stub them as part of the TypeScript 3.9.2+ update

It turns out that you can no longer stub free-standing functions in Typescript 3.9.2+ according to this issue:

microsoft/TypeScript#38568
sinonjs/sinon#562

The test in App.test.tsx was failing when it tried to get the callCount for a stub for a free-standing function getCurrentUser, and currently, my package-lock.json has 3.9.5, so that appears to be why. My fix was to use an object where the functions become methods instead.

src/client/api/users.ts

@@ -5,4 +5,12 @@ import request, { AxiosPromise } from './request';
  * Get the currently authenticated user
  */
 
-export const getCurrentUser = (): AxiosPromise<UserResponse> => request.get('/api/users/current');
+const getCurrentUser = (): AxiosPromise<UserResponse> => request.get('/api/users/current');
+
+/**
+ * Export the methods as part of an object so that they are stubbable.
+ * See: https://github.com/sinonjs/sinon/issues/562
+ */
+export const UserAPI = {
+  getCurrentUser,
+};