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next.js/examples/with-redux/lib/with-redux-store.js

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import React from 'react'
import { initializeStore } from '../store'
const isServer = typeof window === 'undefined'
const __NEXT_REDUX_STORE__ = '__NEXT_REDUX_STORE__'
function getOrCreateStore (initialState) {
// Always make a new store if server, otherwise state is shared between requests
if (isServer) {
return initializeStore(initialState)
}
// Create store if unavailable on the client and set it on the window object
if (!window[__NEXT_REDUX_STORE__]) {
window[__NEXT_REDUX_STORE__] = initializeStore(initialState)
}
return window[__NEXT_REDUX_STORE__]
}
export default App => {
return class AppWithRedux extends React.Component {
static async getInitialProps (appContext) {
// Get or Create the store with `undefined` as initialState
// This allows you to set a custom default initialState
const reduxStore = getOrCreateStore()
// Provide the store to getInitialProps of pages
appContext.ctx.reduxStore = reduxStore
let appProps = {}
if (typeof App.getInitialProps === 'function') {
appProps = await App.getInitialProps(appContext)
}
return {
...appProps,
initialReduxState: reduxStore.getState()
}
}
constructor (props) {
super(props)
this.reduxStore = getOrCreateStore(props.initialReduxState)
}
render () {
return <App {...this.props} reduxStore={this.reduxStore} />
}
}
}