fix(overmind-react): fix typing issue

Author: christianalfoni

packages/node_modules/overmind-react/src/index.ts

@@ -5,6 +5,7 @@ import {
   Overmind,
   OvermindMock,
 } from 'overmind'
+import 'proxy-state-tree'
 import {
   // @ts-ignore
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
@@ -22,6 +23,7 @@ import {
   createContext,
   useContext,
 } from 'react'
+import { IMutationCallback } from 'proxy-state-tree'
 
 const IS_PRODUCTION = process.env.NODE_ENV === 'production'
 const IS_TEST = process.env.NODE_ENV === 'test'
@@ -64,7 +66,7 @@ export const createHook = <Config extends IConfiguration>(
   state: Overmind<Config>['state']
   actions: Overmind<Config>['actions']
   effects: Overmind<Config>['effects']
-  addMutationListener: Overmind<Config>['addMutationListener']
+  addMutationListener: (cb: IMutationCallback) => () => void
 }) => {
   if (overmindInstance) {
     console.warn(