Web-Sockets in ReactJS with PusherJs and Laravel Echo with public and private channels

channels.tsx

import React, { useEffect, useState, useMemo } from "react"
import Echo from "laravel-echo"
import Pusher from "pusher-js"

/**
 * Pusher configuration
 */
const pusherConfig = {
  key: '<your_pusher_key_here>',
  cluster: '<pusher_cluster>',
  // auth endpoint for private channels
  // e.g. for Laravel https://example.com/api/broadcasting/auth
  authEndpoint: '<auth_endpoint_for_private_channels>'
}


/**
 * Context for Channels
 */
type TChannels = Echo | undefined
const ChannelsContext = React.createContext<TChannels>(undefined)

/**
 * Channel Context Provider
 */
export function ChannelsProvider({
  children,
  authUser,
  authToken
}: {
  children: React.ReactNode,
  authUser?: any
  authToken?: string
}) {
  const [channels, setChannels] = useState<TChannels>(undefined)
  useEffect(() => {
      const channels = getChannels(pusherConfig, authToken);
      setChannels(channels)
      return () => {
         // disconnect from server and reset the channels
         channels.disconnect()
         setChannels(undefined)
      }
  }, [authUser, authToken])
  return (
    <ChannelContext.Provider value={channels}>
      {children}
    </ChannelContext.Provider>
  )
}

/**
 * Hook to use the channels provided via context
 */
export function useChannels() {
  const channels = React.useContext(ChannelsContext)
  return channels
}

/**
 * Use private channels
 * It simple return the useChannels with authenticated user bindings
 */ 
export function usePrivateChannels (authUserId: any) {
  const channels = useChannels()
  return useMemo(() => {
    return channels && channels.private("users." + authUserId)
  }, [channels, authUserId])
}
    
/**
 * Get the channels
 */
function getChannels(pusherConfig: typeof pusherConfig, authToken?: string) {
  const client = new Pusher(pusherConfig.key, {
    cluster: pusherConfig.cluster,
    forceTLS: true,
    authEndpoint: pusherConfig.authEndpoint,
    auth: authToken ? {
      headers: {
        // pass the authorization token when using private channels
        Authorization: `Bearer ${authToken}`,
      },
    }: undefined,
  })

  const channels = new Echo({
    broadcaster: "pusher",
    client: client,
  })
  return channels
}

usage_1_notifications_with_private_channels.tsx

import React, { useEffect } from 'react'
import { ChannelsProvider, usePrivateChannels } from "./channels"

// FIRST: we will wrap our application with the `ChannelsProvider`

function App () {
  // get the user and the access token SOMEHOW!
  const user = getUser() // via context or any other way
  const token = getToken() // via local storage or any other ways
  return <ChannelsProvider authUser={user} authToken={token}>
    <Notifications authUserId={user.id} />
  </ChannelsProvider>
}


// Next, we will listen to a private channel for an event
// and update the data on events

// A channel listens to a particular event
// Here is an example event from Laravel when sending notifications
const NOTIFICATION_EVENT =
  ".Illuminate\\Notifications\\Events\\BroadcastNotificationCreated"

interface INotification {
  id: number,
  content: string
}

/**
 * Our notification channel which notif
 */
function useNotificationChannel (
  authUserId: integer,
  onChange: (notification: INotification) => void
) {
  const channels = usePrivateChannels(authUserId)
  useEffect(() => {
    if (channels) {
      channels.listen(NOTIFICATION_EVENT, onChange)
      // same as channels.notification(onChange)
      return () => {
        channels.stopListening(NOTIFICATION_EVENT)
      }
    }
  }, [channels, onChange])
}

export function Notifications({ authUserId }: { authUserId: integer }) {
  const [notifications, setNotifications] = useState<Array<INotification>>([])
  const handleNotificationsEvent = useCallback((notification: INotification) => {
    setNotifications(
      existingNotifications => ([notification].concat(existingNotifications))
    )
  })
  useNotificationChannel(authUserId, handleNotificationsEvent)
  return <ol>
   {notifications.map(n => <li key={n.id}>{n.content}</li>}
  </ol>
}

Please, do you it js version. and where would the configuration be in If it is used in nextjs