Generic Reducer for Redux - update state with any action key/vaue passed (excluding type)

generic-reducer.js

//generic event type for updating state
export const UPDATE = 'STATE_UPDATE'
//generic reducer for updating state
export const reducer = (state, action) => {
  //console.log(action)
  const { type } = action
  switch (type) {
    case UPDATE:
      const a = { ...action }
      delete a.type
      return { ...state, ...a }
    default:
      return state
  }
}