action types file

src/redux/actions/actionTypes.js

@@ -0,0 +1 @@
+export const CREATE_COURSE = "CREATE_COURSE";

src/redux/actions/courseActions.js

@@ -1,3 +1,5 @@
+import * as types from "./actionTypes";
+
 export function createCourse(course) {
-  return { type: "CREATE_COURSE", course };
+  return { type: types.CREATE_COURSE, course };
 }

src/redux/reducers/courseReducer.js

@@ -1,6 +1,8 @@
+import * as types from "../actions/actionTypes";
+
 export default function courseReducer(state = [], action) {
   switch (action.type) {
-    case "CREATE_COURSE":
+    case types.CREATE_COURSE:
       return [...state, { ...action.course }];
 
     default: