type definitions for Redux applyMiddleware

gistfile1.txt

type action = {
  type: string;
};

type reducer = (state: any, action: action) => any;

type listener = () => void;

type dispatch = (action: action) => action;

type subscribe = (listener: listener) => void;

type getState = () => any;

type replaceReducer = (reducer: reducer) => reducer;

type store = {
  dispatch: dispatch;
  subscribe: subscribe;
  getState: getState;
  replaceReducer: replaceReducer; 
}

type middlewareAPI = {
  getState: getState,
  dispatch: dispatch
};

type middleware = (store: middlewareAPI) => (next: dispatch) => (action: action) => action;

type createStore = (reducer: reducer, initialState: any) => store;

// https://github.com/rackt/redux/blob/v3.0.0/src/utils/applyMiddleware.js
type applyMiddleware = (...middlewares : middleware[]) => ((createStore: createStore) => createStore);