mi-propuesta-indecente.js

import { Counter, createCounter, increment, decrement } from '../../entities/Counter';
import { CounterAction } from './actions';
import { CounterActionTypes } from './types';
import { identity } from './lodash-identity';

export type CounterState = Counter;

const initialState: CounterState = createCounter();

function counterReducer (state: CounterState = initialState, action: CounterAction): CounterState {
  return (this[action.type] || identity)(state);
}
counterReducer[CounterActionTypes.INCREMENT] = increment;
counterReducer[CounterActionTypes.DECREMENT] = decrement;

export counterReducer;