Create Reducer

create-reducer.js

const createReducer = (initialState, actionMap) => (state = initialState, action) => {
  const {signals} = action
  if (signals) {
    const signal = signals.find(
      (stepAction) => actionMap[stepAction.type]
    )
    if (signal) {
      const reducer = actionMap[signal.type]
      return reducer(state, signal)
    } else {
      return state
    }
  } else {
    const reducer = actionMap[action.type]
    if (reducer) return reducer(state, action)
    return state
  }
}

export default createReducer