Quickstart with Redux

Easily integrate Redux to provide a simple way to manage state across your browser extension.

We maintain a custom fork of redux-persist (opens in a new tab) which you can utilize along with redux-persist-webextension-storage (opens in a new tab) to persist your Redux state using chrome.storage.

Just a heads up, the current version does not support content scripts. If you'd like content script support, please file an issue (opens in a new tab), and we will prioritize adding that functionality.

Increment Example

Let's make a basic extension that increments and decrements a counter.

Create Your Slice

counter-slice.ts

import { createSlice } from "@reduxjs/toolkit"
 
export interface CounterState {
  count: number
}
 
const counterSlice = createSlice({
  name: "counter",
  initialState: { count: 0 },
  reducers: {
    increment: (state) => {
      state.count += 1
    },
    decrement: (state) => {
      state.count -= 1
    }
  }
})
 
export const { increment, decrement } = counterSlice.actions
 
export default counterSlice.reducer

Create Your Store

store.ts

import { configureStore } from "@reduxjs/toolkit"
import { localStorage } from "redux-persist-webextension-storage"
 
import {
  FLUSH,
  PAUSE,
  PERSIST,
  PURGE,
  REGISTER,
  REHYDRATE,
  RESYNC,
  persistReducer,
  persistStore
} from "@plasmohq/redux-persist"
import { Storage } from "@plasmohq/storage"
 
import counterSlice from "~counter-slice"
 
const rootReducer = counterSlice
 
const persistConfig = {
  key: "root",
  version: 1,
  storage: localStorage
}
 
const persistedReducer = persistReducer(persistConfig, rootReducer)
 
export const store = configureStore({
  reducer: persistedReducer,
  middleware: (getDefaultMiddleware) =>
    getDefaultMiddleware({
      serializableCheck: {
        ignoredActions: [
          FLUSH,
          REHYDRATE,
          PAUSE,
          PERSIST,
          PURGE,
          REGISTER,
          RESYNC
        ]
      }
    })
})
export const persistor = persistStore(store)
 
// This is what makes Redux sync properly with multiple pages
// Open your extension's options page and popup to see it in action
new Storage().watch({
  [`persist:${persistConfig.key}`]: () => {
    persistor.resync()
  }
})

The thing to note is the new Storage().watch() call. This will automatically resync the store whenever the Redux store changes in chrome.storage.

Using in React

options.tsx

import { Provider } from "react-redux"
 
import { PersistGate } from "@plasmohq/redux-persist/integration/react"
 
import { CounterView } from "~counter"
import { persistor, store } from "~store"
 
function Options() {
  return (
    <Provider store={store}>
      <PersistGate loading={null} persistor={persistor}>
        <CounterView />
      </PersistGate>
    </Provider>
  )
}
 
export default Options

Using the PersistGate will ensure the child components don't render until the store is ready.

Using in a Background Service Worker

background.ts

import { persistor, store } from "~store"
 
persistor.subscribe(() => {
  console.log("State changed with: ", store?.getState())
})

Full Example

See with-redux (opens in a new tab) for a complete example.

Last updated on December 27, 2022

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