Make TypeScript definition support 4.0.0-beta.2

Author: Wang Zhongliang

index.d.ts

@@ -1,16 +1,18 @@
-import {Middleware, Dispatch} from "redux";
+import { Middleware, Dispatch, Action, AnyAction } from "redux";
 
 
-export type ThunkAction<R, S, E> = (dispatch: Dispatch<S>, getState: () => S,
-                                    extraArgument: E) => R;
+export type ThunkAction<R, S = {}, E = {}, A extends Action<any> = AnyAction> = (
+  dispatch: Dispatch<A>,
+  getState: () => S,
+  extraArgument: E
+) => R;
 
 declare module "redux" {
-  export interface Dispatch<S> {
-    <R, E>(asyncAction: ThunkAction<R, S, E>): R;
+  export interface Dispatch<A extends Action<any> = AnyAction> {
+    <R, E>(asyncAction: ThunkAction<R, {}, E, A>): R;
   }
 }
 
-
 declare const thunk: Middleware & {
   withExtraArgument(extraArgument: any): Middleware;
 };