redux-vertical/src/map-from-action.ts

Build redux vertically

import type { Reducer, Action, AnyAction } from 'redux';

export interface MapAction<A extends Action = AnyAction> {
  <T extends A>(action: T): any;
}

export interface Updater<M = any, S = any> {
  (mapped: M, state: S): any;
}
/**
 * creates a handler for handleActions that will map and action and give you a
 * simpler interface to work with.
 */
export default function mapFromAction(
  mapAction: MapAction,
  updater: Updater,
): Reducer {
  return (state, action) => updater(mapAction(action), state);
}