A less than 10kb packages is mimics the logic behind the combineReducers of redux. It can be used with React hook useReducer

Installation

npm i combine-reducers-react

Basic usage

const [state, reducer] = combineReducers({
  first: [firstInitalState, firstReducer],
  second: [secondInitialState, secondReducer]
})

`

Working example

import combineReducers from 'combine-reducers-react'

 const userInitialState = {
 currentUser: {},
 isloggedIn: false,
 basicDetails: {
   name: null,
   email: null
 }
}

const cartInitialState = {
  itemsAdded: [],
  paymentSummary: {} 
}


const userReducer = (state, action) => {
  const {type, ...data} = action
  switch(type){
    case 'TOGGLE_LOGIN': {
      return {...state, isloggedIn: data.status}
    }
    default: {
      return state
    }
  }
 }

const cartDetailsReducer = (state, action) => {
  const {type, ...data} = action
    switch(type){
      case 'ADD_ITEMS': {
        return {...state, itemsAdded: [...state.itemsAdded, data.item ]}
      }

      default: {
        return state
      }
   }
}

const [state, reducer] = combineReducers({
   user: [userInitialState, userReducer],
   cartDetails: [cartInitialState, cartDetailsReducer]
})

console.log(reducer(state, {type: 'ADD_ITEMS', item: {item: 'ball', quantity: 3}}))
console.log(reducer(state, {type: 'TOGGLE_LOGIN', status: true}))

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