Accept both ways of creating the store

lib/app/store.js

@@ -3,16 +3,36 @@ import Vuex from 'vuex'
 Vue.use(Vuex)
 
 const files = require.context('~store', false, /^\.\/.*\.js$/)
+function getModule (filename) {
+  let file = files(filename)
+  return file.default
+    ? file.default
+    : file
+}
 
-const storeData = { modules: {} }
+let store
+let storeData = {}
+
+// Check if store/index.js returns a vuex store
+if (files.keys().includes('./index.js')) {
+  let mainModule = getModule('./index.js')
+  if (mainModule.commit) {
+    store = mainModule
+  } else {
+    storeData = mainModule
+  }
+}
+
+// Generate the store if there is no store yet
+if (store == null) {
+  storeData.modules = storeData.modules || {}
   for (let filename of files.keys()) {
     let name = filename.replace(/^\.\//, '').replace(/\.js$/, '')
-  if (name === 'index') {
-    Object.assign(storeData, files(filename))
-  } else {
-    storeData.modules[name] = files(filename)
+    if (name === 'index') continue
+    storeData.modules[name] = getModule(filename)
     storeData.modules[name].namespaced = true
   }
+  store = new Vuex.Store(storeData)
 }
 
-export default new Vuex.Store(storeData)
+export default store