A lightweight middleware to sync your redux state across browser tabs. It will listen to the Broadcast Channel and dispatch exactly the same actions dispatched in other tabs to keep the redux state in sync.
It syncs your redux store across tabs with very minimal configuration.
Thanks to BroadcastChannel, we now have a more efficient way to communicate between tabs instead of using any type of local storage. However, Not all the browsers support BroadcastChannel API for now. So I used pubkey's BroadcastChannel to find the best way to communicate between tabs for redux-state-sync. pubkey's BroadcastChannel will make sure that the communication between tabs always works.
How to install
Install with npm.
npm install --save redux-state-sync
Install with yarn
yarn add redux-state-sync
Install with npm.
npm install --save-dev @types/redux-state-sync
Install with yarn
yarn add --dev @types/redux-state-sync
Types are defined here
Before you use
Please take note that BroadcastChannel can only send data that is supported by the structured clone algorithm (Strings, Objects, Arrays, Blobs, ArrayBuffer, Map), so you need to make sure that the actions that you wanna send to other tabs doesn't include any functions in the payload.
If you are using redux-persist, you may need to blacklist some of the actions that is triggered by redux-persist. e.g. persist/PERSIST, persist/REHYDRATE, etc.
How to use
Create the state sync middleware with config:
;;const config =// TOGGLE_TODO will not be triggered in other tabsblacklist: 'TOGGLE_TODO';const middlewares = ;const store = ;// this is used to pass store.dsipatch to the message listener;
initMessageListener is a new function to fix the bug that if the other tab not triggering any action on first load, it cannot receive any messages.
Init new tabs with existing state:
- Use initStateWithPrevTab to get existing state from other tabs
;;const config =// TOGGLE_TODO will not be triggered in other tabsblacklist: 'TOGGLE_TODO';const middlewares = ;const store = ;// init state with other tabs;// initMessageListener(store);
Note: if you are already using initStateWithPrevTab, you don't need to initMessageListener anymore.
- Wrap your root reducer with
;const rootReducer =;rootReducer;
Note: ignore this if you are using
redux-persist, because you will always inite your app with the state in the storage. However, if you don't want to persist the state in the storage and still want to init new tabs with opening tabs' state, you can follow the example above.
Unique name for Broadcast Channel
const config =channel: 'my_broadcast_channel';const middlewares = ;
A function to let you filter the actions as you wanted.
Note: Since version 3.0 the function receives the action itself and not only the action type.
const config =// All actions will be triggered in other tabs except 'TOGGLE_TODO'actiontype !== 'TOGGLE_TODO';const middlewares = ;
A list of action types that you don't want to be triggered in other tabs.
const config =// All actions will be triggered in other tabs except 'TOGGLE_TODO'blacklist: 'TOGGLE_TODO';const middlewares = ;
Only actions in this list will be triggered in other tabs.
const config =// Only 'TOGGLE_TODO' will be triggered in other tabswhitelist: 'TOGGLE_TODO';const middlewares = ;
Warning: You should only use one of the option to filter your actions. if you have all 3 options predicate, blacklist, and whitelist, only one will be effective and the priority is predicate > blacklist > whitelist.
Redux-state-sync is using BroadcastChannel to comunicate between tabs. broadcastChannelOption is the option passed to broadcastChannel when we creating the channel.
const config =// Only 'TOGGLE_TODO' will be triggered in other tabswhitelist: 'TOGGLE_TODO'// enforce a type, oneOf['native', 'idb', 'localstorage', 'node']broadcastChannelOption: type: 'localstorage';const middlewares = ;
Working with immutable.js
Please check the example_immutable folder.
Prepare the initial state for sending to other tabs.
default: state => state
const config =// Map immutable object to jsstate;const middlewares = ;
;;const rootReducer =;appReducer Immutable;