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import type {
NextRouter,
PrivateRouteInfo,
} from '../../shared/lib/router/router'
import connect from './hot-reloader/pages/hot-reloader-pages'
import { sendMessage } from './hot-reloader/pages/websocket'
// Define a local type for the window.next object
interface NextWindow {
next?: {
router?: NextRouter & {
components: { [pathname: string]: PrivateRouteInfo }
}
}
__nextDevClientId?: string
location: Location
}
declare const window: NextWindow
let reloading = false
export default () => {
const devClient = connect()
devClient.subscribeToHmrEvent((obj: any) => {
if (reloading) return
// Retrieve the router if it's available
const router = window.next?.router
// Determine if we're on an error page or the router is not initialized
const isOnErrorPage =
!router || router.pathname === '/404' || router.pathname === '/_error'
switch (obj.action) {
case 'reloadPage': {
sendMessage(
JSON.stringify({
event: 'client-reload-page',
clientId: window.__nextDevClientId,
})
)
reloading = true
return window.location.reload()
}
case 'removedPage': {
const [page] = obj.data
// Check if the removed page is the current page
const isCurrentPage = page === router?.pathname
// We enter here if the removed page is currently being viewed
// or if we happen to be on an error page.
if (isCurrentPage || isOnErrorPage) {
sendMessage(
JSON.stringify({
event: 'client-removed-page',
clientId: window.__nextDevClientId,
page,
})
)
return window.location.reload()
}
return
}
case 'addedPage': {
const [page] = obj.data
// Check if the added page is the current page
const isCurrentPage = page === router?.pathname
// Check if the page component is not yet loaded
const isPageNotLoaded =
typeof router?.components?.[page] === 'undefined'
// We enter this block if the newly added page is the one currently being viewed
// but hasn't been loaded yet, or if we're on an error page.
if ((isCurrentPage && isPageNotLoaded) || isOnErrorPage) {
sendMessage(
JSON.stringify({
event: 'client-added-page',
clientId: window.__nextDevClientId,
page,
})
)
return window.location.reload()
}
return
}
case 'serverError':
case 'devPagesManifestUpdate':
case 'isrManifest':
case 'building':
case 'finishBuilding': {
return
}
default: {
throw new Error('Unexpected action ' + obj.action)
}
}
})
return devClient
}
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