From d252d9da2d62e3880cc4e59ad898bb69f5d5e43f Mon Sep 17 00:00:00 2001
From: Gustav Hansen <gustav.hansen@strapi.io>
Date: Fri, 20 Jan 2023 17:51:59 +0100
Subject: [PATCH] Admin: Allow reducers to be injected async into the store

Co-authored-by: Josh Ellis <josh.ellis@strapi.io>
---
 .../admin/src/core/store/configureStore.js    | 26 ++++++++++++++++---
 .../admin/src/core/store/createReducer.js     |  5 ----
 2 files changed, 22 insertions(+), 9 deletions(-)
 delete mode 100644 packages/core/admin/admin/src/core/store/createReducer.js

diff --git a/packages/core/admin/admin/src/core/store/configureStore.js b/packages/core/admin/admin/src/core/store/configureStore.js
index b95d6223d6..a25be1a4f5 100644
--- a/packages/core/admin/admin/src/core/store/configureStore.js
+++ b/packages/core/admin/admin/src/core/store/configureStore.js
@@ -1,5 +1,4 @@
-import { createStore, applyMiddleware, compose } from 'redux';
-import createReducer from './createReducer';
+import { createStore, applyMiddleware, compose, combineReducers } from 'redux';
 
 const configureStore = (appMiddlewares, appReducers) => {
   let composeEnhancers = compose;
@@ -19,11 +18,30 @@ const configureStore = (appMiddlewares, appReducers) => {
     composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({});
   }
 
-  return createStore(
-    createReducer(appReducers),
+  const store = createStore(
+    createReducer(appReducers, {}),
     {},
     composeEnhancers(applyMiddleware(...middlewares))
   );
+
+  // Add a dictionary to keep track of the registered async reducers
+  store.asyncReducers = {};
+
+  // Create an inject reducer function
+  // This function adds the async reducer, and creates a new combined reducer
+  store.injectReducer = (key, asyncReducer) => {
+    store.asyncReducers[key] = asyncReducer;
+    store.replaceReducer(createReducer(appReducers, store.asyncReducers));
+  };
+
+  return store;
+};
+
+const createReducer = (appReducers, asyncReducers) => {
+  return combineReducers({
+    ...appReducers,
+    ...asyncReducers,
+  });
 };
 
 export default configureStore;
diff --git a/packages/core/admin/admin/src/core/store/createReducer.js b/packages/core/admin/admin/src/core/store/createReducer.js
deleted file mode 100644
index 2c643423b2..0000000000
--- a/packages/core/admin/admin/src/core/store/createReducer.js
+++ /dev/null
@@ -1,5 +0,0 @@
-import { combineReducers } from 'redux';
-
-const createReducer = (reducers) => combineReducers(reducers);
-
-export default createReducer;