Estructura 1

reducers
   index.ts //Combine all reducers
   user.reducer.ts
   product.reducer.ts
actions
   index.ts  //Combine all actions
   user.action.ts
   product.action.ts
effects
   index.ts //Combine all effects
   user.effect.ts
   product.effect.ts
selector
   //Combine all selectors
   user.selector.ts
   product.selector.ts

O

user
  user.reducer.ts
  user.action.ts
  user.effect.ts
  user.selector.ts
product
  product.reducer.ts
  product.action.ts
  product.effect.ts
  product.selector.ts
reducers.ts //Combine all reducers
actions.ts //Combine all actions
effects.ts //Combine all effects
selectors.ts //Combine all selectors