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use mapped type for combineReducers #2623

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use mapped type for combineReducers #2623

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6 changes: 3 additions & 3 deletions index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -59,8 +59,8 @@ export type Reducer<S> = (state: S, action: AnyAction) => S;
/**
* Object whose values correspond to different reducer functions.
*/
export interface ReducersMapObject {
[key: string]: Reducer<any>;
export type ReducersMapObject<TState> = {
[key in keyof TState]: Reducer<TState[key]>;
}

/**
Expand All @@ -81,7 +81,7 @@ export interface ReducersMapObject {
* @returns A reducer function that invokes every reducer inside the passed
* object, and builds a state object with the same shape.
*/
export function combineReducers<S>(reducers: ReducersMapObject): Reducer<S>;
export function combineReducers<S>(reducers: ReducersMapObject<S>): Reducer<S>;


/* store */
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