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Updated the definition of 'Reducer' and 'Dispatch' for TypeScript 2.3+ #2479

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Updated the definition of 'Reducer' and 'Dispatch' for TypeScript 2.3+ #2479

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22 changes: 11 additions & 11 deletions index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ export interface Action {
*
* @template S State object type.
*/
export type Reducer<S> = <A extends Action>(state: S | undefined, action: A) => S;
export type Reducer<S, A extends Action = Action> = (state: S | undefined, action: A) => S;
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I think this should conform with #2467


/**
* Object whose values correspond to different reducer functions.
Expand Down Expand Up @@ -93,8 +93,8 @@ export function combineReducers<S>(reducers: ReducersMapObject<S>): Reducer<S>;
* transform, delay, ignore, or otherwise interpret actions or async actions
* before passing them to the next middleware.
*/
export interface Dispatch<S> {
<A extends Action>(action: A): A;
export interface Dispatch<TInput = Action, TReturn = Action> {
(input: TInput): TReturn;
}

/**
Expand Down Expand Up @@ -138,7 +138,7 @@ export interface Store<S> {
* Note that, if you use a custom middleware, it may wrap `dispatch()` to
* return something else (for example, a Promise you can await).
*/
dispatch: Dispatch<S>;
dispatch: Dispatch;

/**
* Reads the state tree managed by the store.
Expand Down Expand Up @@ -254,7 +254,7 @@ export const createStore: StoreCreator;
/* middleware */

export interface MiddlewareAPI<S> {
dispatch: Dispatch<S>;
dispatch: Dispatch;
getState(): S;
}

Expand All @@ -267,8 +267,8 @@ export interface MiddlewareAPI<S> {
* logging actions, performing side effects like routing, or turning an
* asynchronous API call into a series of synchronous actions.
*/
export interface Middleware {
<S>(api: MiddlewareAPI<S>): (next: Dispatch<S>) => Dispatch<S>;
export interface Middleware<S> {
(api: MiddlewareAPI<S>): (next: Dispatch) => Dispatch;
}

/**
Expand Down Expand Up @@ -340,19 +340,19 @@ export interface ActionCreatorsMapObject {
* creator wrapped into the `dispatch` call. If you passed a function as
* `actionCreator`, the return value will also be a single function.
*/
export function bindActionCreators<A extends ActionCreator<any>>(actionCreator: A, dispatch: Dispatch<any>): A;
export function bindActionCreators<A extends ActionCreator<any>>(actionCreator: A, dispatch: Dispatch): A;

export function bindActionCreators<
A extends ActionCreator<any>,
B extends ActionCreator<any>
>(actionCreator: A, dispatch: Dispatch<any>): B;
>(actionCreator: A, dispatch: Dispatch): B;

export function bindActionCreators<M extends ActionCreatorsMapObject>(actionCreators: M, dispatch: Dispatch<any>): M;
export function bindActionCreators<M extends ActionCreatorsMapObject>(actionCreators: M, dispatch: Dispatch): M;

export function bindActionCreators<
M extends ActionCreatorsMapObject,
N extends ActionCreatorsMapObject
>(actionCreators: M, dispatch: Dispatch<any>): N;
>(actionCreators: M, dispatch: Dispatch): N;


/* compose */
Expand Down