Add redux action type

src/renderer/types/redux.js

@@ -0,0 +1,6 @@
+// @flow
+
+// eslint-disable-next-line no-use-before-define
+export type Dispatch<T> = (action: T | Promise<T> | Array<T> | ThunkAction<T>) => any; // Need to refer to ThunkAction
+export type GetState = () => {};
+export type ThunkAction<T> = (dispatch: Dispatch<T>, getState: GetState) => any;