feat(lib): provide store functionality (resubmitted)

src/components/ngRedux.js

@@ -2,6 +2,8 @@ import Connector from './connector';
 import invariant from 'invariant';
 import {createStore, applyMiddleware, compose, combineReducers} from 'redux';
 import digestMiddleware from './digestMiddleware';
+import providedStoreMiddleware from './providedStoreMiddleware';
+import wrapStore from './storeWrapper';
 
 import curry from 'lodash.curry';
 import isFunction from 'lodash.isfunction';
@@ -20,6 +22,13 @@ export default function ngReduxProvider() {
   let _storeEnhancers = undefined;
   let _initialState = undefined;
   let _reducerIsObject = undefined;
+  let _providedStore = undefined;
+
+  this.provideStore = (store) => {
+    _providedStore = store;
+    _reducer = (state, action) => action.payload;
+    _middlewares = [providedStoreMiddleware(_providedStore)];
+  }
 
   this.createStoreWith = (reducer, middlewares, storeEnhancers, initialState) => {
     invariant(
@@ -79,7 +88,11 @@ export default function ngReduxProvider() {
       ? applyMiddleware(...resolvedMiddleware)(finalCreateStore)(_reducer, _initialState)
       : applyMiddleware(...resolvedMiddleware)(finalCreateStore)(_reducer);
 
-    return assign({}, store, { connect: Connector(store) });
+    const mergedStore = assign({}, store, { connect: Connector(store) });
+
+    if (_providedStore) wrapStore(_providedStore, mergedStore)
+
+    return mergedStore;
   };
 
   this.$get.$inject = ['$injector'];

src/components/providedStoreMiddleware.js

@@ -0,0 +1,11 @@
+/**
+ * middleware for the empty store that ng-redux uses when a external store is provided
+ * Provides two cases:
+ * 1. NGREDUX_PASSTHROUGH, where data is coming IN to the "fake" store
+ * 2. all other, where actions are dispatched out, and proxied to the true store
+ */
+export default _providedStore => store => next => action => {
+  return action.type === '@@NGREDUX_PASSTHROUGH'
+    ? next(action)
+    : _providedStore.dispatch(action)
+}

src/components/storeWrapper.js

@@ -0,0 +1,11 @@
+export default function wrapStore(providedStore, ngReduxStore) {
+  const unsubscribe = providedStore
+    .subscribe(() => {
+      let newState = providedStore.getState();
+      ngReduxStore.dispatch({
+        type: '@@NGREDUX_PASSTHROUGH',
+        payload: newState
+      });
+    })
+  ;
+}