Create instance without key

.gitignore

@@ -2,3 +2,4 @@ lib/
 node_modules/
 *.swp
 package-lock.json
+.idea/

src/create-instance.js

@@ -1,4 +1,5 @@
 import { createDynamicMiddlewares } from 'redux-dynamic-middlewares'
+import { combineReducers } from 'redux';
 
 import { configureStore } from './configure-store'
 import { reloadState } from './reload-state'
@@ -15,16 +16,32 @@ const createInstance = ({
   thunk = {},
   reducer = emptyReducer,
   middleware = emptyMiddleware,
+  useKey = true,
   withDevTools,
 } = {}) => {
   const dynamicMiddlewares = createDynamicMiddlewares()
+  const reducerWrapper = (reducer && reducer.wrapper) ? reducer.wrapper : combineReducers
+  const reducerInitial = (reducer && reducer.wrapper) ? reducer.wrapper(reducer.reducers) : emptyReducer
+
+  let reducers
+
+  // TODO: add check for reducer - that absent duplicate
+  if (useKey) {
+    reducers = {
+      [key]: (state = initial, action) => reducer(state, action),
+    }
+  } else {
+    reducers = (reducer && reducer.reducers) ? { ...reducer.reducers } : (state = initial, action) => reducer(state, action)
+  }
+
+  dynamicMiddlewares.addMiddleware(middleware)
+
   const registry = {
     keys: {
       [key]: true,
     },
-    reducers: {
-      [key]: (state = initial, action) => reducer(state, action),
-    },
+    reducers,
+    reducerWrapper,
     thunks: {
       [key]: thunk,
     },
@@ -37,7 +54,8 @@ const createInstance = ({
     name,
     withDevTools,
     key,
-    reducer: emptyReducer,
+    initial,
+    reducer: reducerInitial,
     dynamicMiddlewares: dynamicMiddlewares.enhancer,
   })
 

src/reload-state.js

@@ -1,8 +1,7 @@
-import { combineReducers } from 'redux'
 import thunkMiddleware from 'redux-thunk'
 
 const reloadState = (registry, store, dynamicMiddlewares) => {
-  store.replaceReducer(combineReducers(registry.reducers))
+  store.replaceReducer(registry.reducerWrapper(registry.reducers))
   dynamicMiddlewares.resetMiddlewares()
 
   const thunkObject = thunkMiddleware.withExtraArgument(registry.thunks)