feat: Convert all app files to JS

packages/backend/src/apps/slack/common/add-auth-header.js

@@ -1,6 +1,4 @@
-import { TBeforeRequest } from '@automatisch/types';
-
-const addAuthHeader: TBeforeRequest = ($, requestConfig) => {
+const addAuthHeader = ($, requestConfig) => {
   const authData = $.auth.data;
   if (
     requestConfig.headers &&

packages/backend/src/apps/slack/common/get-current-user.js

@@ -1,8 +1,6 @@
-import { IGlobalVariable, IJSONObject } from '@automatisch/types';
-
-const getCurrentUser = async ($: IGlobalVariable): Promise<IJSONObject> => {
+const getCurrentUser = async ($) => {
   const params = {
-    user: $.auth.data.userId as string,
+    user: $.auth.data.userId,
   };
   const response = await $.http.get('/users.info', { params });
   const currentUser = response.data.user;