diff --git a/src/types.ts b/src/types.ts
index 5bacf08..782d9a7 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -12,4 +12,5 @@ export type Mutation<S=any> = (payload: any, action: Action) => (state: S) => S
 export type ActionCreator = (...args: any[] ) => Action;
 
 export type UpduxConfig = Partial<{
+    subduxes: {}
 }>;
diff --git a/src/updux.js b/src/updux.ts
similarity index 81%
rename from src/updux.js
rename to src/updux.ts
index 44d6303..1af27a5 100644
--- a/src/updux.js
+++ b/src/updux.ts
@@ -6,14 +6,17 @@ import buildMutations from './buildMutations';
 import buildCreateStore from './buildCreateStore';
 import buildMiddleware from './buildMiddleware';
 import buildUpreducer from './buildUpreducer';
+import { UpduxConfig, Dictionary } from './types';
 
 export class Updux {
 
-    constructor(config) {
+    subduxes: Dictionary<Updux>;
+
+    constructor(config: UpduxConfig) {
 
         this.subduxes = fp.mapValues(
-            value => fp.isPlainObject(value) ? new Updux(value ) : value )(fp.getOr({},'subduxes',config)
-        );
+            (value:UpduxConfig|Updux) => fp.isPlainObject(value) ? new Updux(value) : value )(fp.getOr({},'subduxes',config)
+        ) as Dictionary<Updux>;
 
 
         this.actions = buildActions(