reducers.js

// src/store/reducers.js

import match from 'conditional-expression';

const initialState = {
  something: 'data',
  somethingElse: 'also data'
};

const types = {
  TRIGGER_ACTION: 'TRIGGER_ACTION'
}; // types could be in a separate file

const reducer = (state = initialState, action) =>
  match(action.type)
    .equals(types.TRIGGER_ACTION)
      .then({...state, something: action.payload})
    .equals(types.DIFFERENT_ACTION)
      .then({...state, somethingElse: action.payload}
    .else(state);

export {initialState, types, reducer};