diff --git a/src/buildCreateStore.js b/src/buildCreateStore.js
deleted file mode 100644
index 76654ba..0000000
--- a/src/buildCreateStore.js
+++ /dev/null
@@ -1,17 +0,0 @@
-import { createStore as reduxCreateStore, applyMiddleware } from 'redux';
-
-export default function buildCreateStore( reducer, initial, middleware,
-                                        actions ) {
-    return () => {
-      const store =  reduxCreateStore( reducer, initial,
-          applyMiddleware( middleware)
-        );
-      for ( let a in actions ) {
-          store.dispatch[a] = (...args) => {
-              store.dispatch(actions[a](...args))
-          };
-      }
-
-      return store;
-  }
-};
diff --git a/src/buildCreateStore/index.ts b/src/buildCreateStore/index.ts
new file mode 100644
index 0000000..650c448
--- /dev/null
+++ b/src/buildCreateStore/index.ts
@@ -0,0 +1,31 @@
+import {
+  createStore as reduxCreateStore,
+  applyMiddleware,
+  Middleware,
+  Reducer,
+} from 'redux';
+import { ActionCreator, Dictionary } from '../types';
+
+function buildCreateStore<S>(
+  reducer: Reducer<S>,
+  initial: S,
+  middleware: Middleware,
+  actions: Dictionary<ActionCreator>,
+) {
+  return () => {
+    const store = reduxCreateStore(
+      reducer,
+      initial,
+      applyMiddleware(middleware),
+    );
+    for (let a in actions) {
+      ( store.dispatch as any)[a] = (...args: any[]) => {
+        store.dispatch(actions[a](...args));
+      };
+    }
+
+    return store;
+  };
+}
+
+export default buildCreateStore;