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app-router.tsx
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app-router.tsx
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'use client'
import type { ReactNode } from 'react'
import React, {
use,
useEffect,
useMemo,
useCallback,
startTransition,
useInsertionEffect,
useDeferredValue,
} from 'react'
import {
AppRouterContext,
LayoutRouterContext,
GlobalLayoutRouterContext,
MissingSlotContext,
} from '../../shared/lib/app-router-context.shared-runtime'
import type {
CacheNode,
AppRouterInstance,
} from '../../shared/lib/app-router-context.shared-runtime'
import type { ErrorComponent } from './error-boundary'
import {
ACTION_FAST_REFRESH,
ACTION_NAVIGATE,
ACTION_PREFETCH,
ACTION_REFRESH,
ACTION_RESTORE,
ACTION_SERVER_ACTION,
ACTION_SERVER_PATCH,
PrefetchKind,
} from './router-reducer/router-reducer-types'
import type {
AppRouterState,
ReducerActions,
RouterChangeByServerResponse,
RouterNavigate,
ServerActionDispatcher,
} from './router-reducer/router-reducer-types'
import { createHrefFromUrl } from './router-reducer/create-href-from-url'
import {
SearchParamsContext,
PathnameContext,
PathParamsContext,
} from '../../shared/lib/hooks-client-context.shared-runtime'
import {
useReducerWithReduxDevtools,
useUnwrapState,
type ReduxDevtoolsSyncFn,
} from './use-reducer-with-devtools'
import { ErrorBoundary } from './error-boundary'
import { createInitialRouterState } from './router-reducer/create-initial-router-state'
import type { InitialRouterStateParameters } from './router-reducer/create-initial-router-state'
import { isBot } from '../../shared/lib/router/utils/is-bot'
import { addBasePath } from '../add-base-path'
import { AppRouterAnnouncer } from './app-router-announcer'
import { RedirectBoundary } from './redirect-boundary'
import { findHeadInCache } from './router-reducer/reducers/find-head-in-cache'
import { unresolvedThenable } from './unresolved-thenable'
import { NEXT_RSC_UNION_QUERY } from './app-router-headers'
import { removeBasePath } from '../remove-base-path'
import { hasBasePath } from '../has-base-path'
import { PAGE_SEGMENT_KEY } from '../../shared/lib/segment'
import type { Params } from '../../shared/lib/router/utils/route-matcher'
import type { FlightRouterState } from '../../server/app-render/types'
const isServer = typeof window === 'undefined'
// Ensure the initialParallelRoutes are not combined because of double-rendering in the browser with Strict Mode.
let initialParallelRoutes: CacheNode['parallelRoutes'] = isServer
? null!
: new Map()
let globalServerActionDispatcher = null as ServerActionDispatcher | null
export function getServerActionDispatcher() {
return globalServerActionDispatcher
}
const globalMutable: {
pendingMpaPath?: string
} = {}
export function urlToUrlWithoutFlightMarker(url: string): URL {
const urlWithoutFlightParameters = new URL(url, location.origin)
urlWithoutFlightParameters.searchParams.delete(NEXT_RSC_UNION_QUERY)
if (process.env.NODE_ENV === 'production') {
if (
process.env.__NEXT_CONFIG_OUTPUT === 'export' &&
urlWithoutFlightParameters.pathname.endsWith('.txt')
) {
const { pathname } = urlWithoutFlightParameters
const length = pathname.endsWith('/index.txt') ? 10 : 4
// Slice off `/index.txt` or `.txt` from the end of the pathname
urlWithoutFlightParameters.pathname = pathname.slice(0, -length)
}
}
return urlWithoutFlightParameters
}
// this function performs a depth-first search of the tree to find the selected
// params
function getSelectedParams(
currentTree: FlightRouterState,
params: Params = {}
): Params {
const parallelRoutes = currentTree[1]
for (const parallelRoute of Object.values(parallelRoutes)) {
const segment = parallelRoute[0]
const isDynamicParameter = Array.isArray(segment)
const segmentValue = isDynamicParameter ? segment[1] : segment
if (!segmentValue || segmentValue.startsWith(PAGE_SEGMENT_KEY)) continue
// Ensure catchAll and optional catchall are turned into an array
const isCatchAll =
isDynamicParameter && (segment[2] === 'c' || segment[2] === 'oc')
if (isCatchAll) {
params[segment[0]] = segment[1].split('/')
} else if (isDynamicParameter) {
params[segment[0]] = segment[1]
}
params = getSelectedParams(parallelRoute, params)
}
return params
}
type AppRouterProps = Omit<
Omit<InitialRouterStateParameters, 'isServer' | 'location'>,
'initialParallelRoutes'
> & {
buildId: string
initialHead: ReactNode
initialLayerAssets: ReactNode
assetPrefix: string
missingSlots: Set<string>
}
function isExternalURL(url: URL) {
return url.origin !== window.location.origin
}
function HistoryUpdater({
appRouterState,
sync,
}: {
appRouterState: AppRouterState
sync: ReduxDevtoolsSyncFn
}) {
useInsertionEffect(() => {
const { tree, pushRef, canonicalUrl } = appRouterState
const historyState = {
...(pushRef.preserveCustomHistoryState ? window.history.state : {}),
// Identifier is shortened intentionally.
// __NA is used to identify if the history entry can be handled by the app-router.
// __N is used to identify if the history entry can be handled by the old router.
__NA: true,
__PRIVATE_NEXTJS_INTERNALS_TREE: tree,
}
if (
pushRef.pendingPush &&
// Skip pushing an additional history entry if the canonicalUrl is the same as the current url.
// This mirrors the browser behavior for normal navigation.
createHrefFromUrl(new URL(window.location.href)) !== canonicalUrl
) {
// This intentionally mutates React state, pushRef is overwritten to ensure additional push/replace calls do not trigger an additional history entry.
pushRef.pendingPush = false
window.history.pushState(historyState, '', canonicalUrl)
} else {
window.history.replaceState(historyState, '', canonicalUrl)
}
sync(appRouterState)
}, [appRouterState, sync])
return null
}
export function createEmptyCacheNode(): CacheNode {
return {
lazyData: null,
rsc: null,
prefetchRsc: null,
head: null,
layerAssets: null,
prefetchLayerAssets: null,
prefetchHead: null,
parallelRoutes: new Map(),
lazyDataResolved: false,
loading: null,
}
}
function useServerActionDispatcher(dispatch: React.Dispatch<ReducerActions>) {
const serverActionDispatcher: ServerActionDispatcher = useCallback(
(actionPayload) => {
startTransition(() => {
dispatch({
...actionPayload,
type: ACTION_SERVER_ACTION,
})
})
},
[dispatch]
)
globalServerActionDispatcher = serverActionDispatcher
}
/**
* Server response that only patches the cache and tree.
*/
function useChangeByServerResponse(
dispatch: React.Dispatch<ReducerActions>
): RouterChangeByServerResponse {
return useCallback(
({ previousTree, serverResponse }) => {
startTransition(() => {
dispatch({
type: ACTION_SERVER_PATCH,
previousTree,
serverResponse,
})
})
},
[dispatch]
)
}
function useNavigate(dispatch: React.Dispatch<ReducerActions>): RouterNavigate {
return useCallback(
(href, navigateType, shouldScroll) => {
const url = new URL(addBasePath(href), location.href)
return dispatch({
type: ACTION_NAVIGATE,
url,
isExternalUrl: isExternalURL(url),
locationSearch: location.search,
shouldScroll: shouldScroll ?? true,
navigateType,
})
},
[dispatch]
)
}
function copyNextJsInternalHistoryState(data: any) {
if (data == null) data = {}
const currentState = window.history.state
const __NA = currentState?.__NA
if (__NA) {
data.__NA = __NA
}
const __PRIVATE_NEXTJS_INTERNALS_TREE =
currentState?.__PRIVATE_NEXTJS_INTERNALS_TREE
if (__PRIVATE_NEXTJS_INTERNALS_TREE) {
data.__PRIVATE_NEXTJS_INTERNALS_TREE = __PRIVATE_NEXTJS_INTERNALS_TREE
}
return data
}
function Head({
headCacheNode,
}: {
headCacheNode: CacheNode | null
}): React.ReactNode {
// If this segment has a `prefetchHead`, it's the statically prefetched data.
// We should use that on initial render instead of `head`. Then we'll switch
// to `head` when the dynamic response streams in.
const head = headCacheNode !== null ? headCacheNode.head : null
const prefetchHead =
headCacheNode !== null ? headCacheNode.prefetchHead : null
// If no prefetch data is available, then we go straight to rendering `head`.
const resolvedPrefetchRsc = prefetchHead !== null ? prefetchHead : head
// We use `useDeferredValue` to handle switching between the prefetched and
// final values. The second argument is returned on initial render, then it
// re-renders with the first argument.
//
// @ts-expect-error The second argument to `useDeferredValue` is only
// available in the experimental builds. When its disabled, it will always
// return `head`.
return useDeferredValue(head, resolvedPrefetchRsc)
}
/**
* The global router that wraps the application components.
*/
function Router({
buildId,
initialHead,
initialLayerAssets,
initialTree,
initialCanonicalUrl,
initialSeedData,
couldBeIntercepted,
assetPrefix,
missingSlots,
}: AppRouterProps) {
const initialState = useMemo(
() =>
createInitialRouterState({
buildId,
initialSeedData,
initialCanonicalUrl,
initialTree,
initialParallelRoutes,
location: !isServer ? window.location : null,
initialHead,
initialLayerAssets,
couldBeIntercepted,
}),
[
buildId,
initialSeedData,
initialCanonicalUrl,
initialTree,
initialHead,
initialLayerAssets,
couldBeIntercepted,
]
)
const [reducerState, dispatch, sync] =
useReducerWithReduxDevtools(initialState)
useEffect(() => {
// Ensure initialParallelRoutes is cleaned up from memory once it's used.
initialParallelRoutes = null!
}, [])
const { canonicalUrl } = useUnwrapState(reducerState)
// Add memoized pathname/query for useSearchParams and usePathname.
const { searchParams, pathname } = useMemo(() => {
const url = new URL(
canonicalUrl,
typeof window === 'undefined' ? 'http://n' : window.location.href
)
return {
// This is turned into a readonly class in `useSearchParams`
searchParams: url.searchParams,
pathname: hasBasePath(url.pathname)
? removeBasePath(url.pathname)
: url.pathname,
}
}, [canonicalUrl])
const changeByServerResponse = useChangeByServerResponse(dispatch)
const navigate = useNavigate(dispatch)
useServerActionDispatcher(dispatch)
/**
* The app router that is exposed through `useRouter`. It's only concerned with dispatching actions to the reducer, does not hold state.
*/
const appRouter = useMemo<AppRouterInstance>(() => {
const routerInstance: AppRouterInstance = {
back: () => window.history.back(),
forward: () => window.history.forward(),
prefetch: (href, options) => {
// Don't prefetch for bots as they don't navigate.
// Don't prefetch during development (improves compilation performance)
if (
isBot(window.navigator.userAgent) ||
process.env.NODE_ENV === 'development'
) {
return
}
const url = new URL(addBasePath(href), window.location.href)
// External urls can't be prefetched in the same way.
if (isExternalURL(url)) {
return
}
startTransition(() => {
dispatch({
type: ACTION_PREFETCH,
url,
kind: options?.kind ?? PrefetchKind.FULL,
})
})
},
replace: (href, options = {}) => {
startTransition(() => {
navigate(href, 'replace', options.scroll ?? true)
})
},
push: (href, options = {}) => {
startTransition(() => {
navigate(href, 'push', options.scroll ?? true)
})
},
refresh: () => {
startTransition(() => {
dispatch({
type: ACTION_REFRESH,
origin: window.location.origin,
})
})
},
fastRefresh: () => {
if (process.env.NODE_ENV !== 'development') {
throw new Error(
'fastRefresh can only be used in development mode. Please use refresh instead.'
)
} else {
startTransition(() => {
dispatch({
type: ACTION_FAST_REFRESH,
origin: window.location.origin,
})
})
}
},
}
return routerInstance
}, [dispatch, navigate])
useEffect(() => {
// Exists for debugging purposes. Don't use in application code.
if (window.next) {
window.next.router = appRouter
}
}, [appRouter])
if (process.env.NODE_ENV !== 'production') {
// eslint-disable-next-line react-hooks/rules-of-hooks
const { cache, prefetchCache, tree } = useUnwrapState(reducerState)
// This hook is in a conditional but that is ok because `process.env.NODE_ENV` never changes
// eslint-disable-next-line react-hooks/rules-of-hooks
useEffect(() => {
// Add `window.nd` for debugging purposes.
// This is not meant for use in applications as concurrent rendering will affect the cache/tree/router.
// @ts-ignore this is for debugging
window.nd = {
router: appRouter,
cache,
prefetchCache,
tree,
}
}, [appRouter, cache, prefetchCache, tree])
}
useEffect(() => {
// If the app is restored from bfcache, it's possible that
// pushRef.mpaNavigation is true, which would mean that any re-render of this component
// would trigger the mpa navigation logic again from the lines below.
// This will restore the router to the initial state in the event that the app is restored from bfcache.
function handlePageShow(event: PageTransitionEvent) {
if (
!event.persisted ||
!window.history.state?.__PRIVATE_NEXTJS_INTERNALS_TREE
) {
return
}
// Clear the pendingMpaPath value so that a subsequent MPA navigation to the same URL can be triggered.
// This is necessary because if the browser restored from bfcache, the pendingMpaPath would still be set to the value
// of the last MPA navigation.
globalMutable.pendingMpaPath = undefined
dispatch({
type: ACTION_RESTORE,
url: new URL(window.location.href),
tree: window.history.state.__PRIVATE_NEXTJS_INTERNALS_TREE,
})
}
window.addEventListener('pageshow', handlePageShow)
return () => {
window.removeEventListener('pageshow', handlePageShow)
}
}, [dispatch])
// When mpaNavigation flag is set do a hard navigation to the new url.
// Infinitely suspend because we don't actually want to rerender any child
// components with the new URL and any entangled state updates shouldn't
// commit either (eg: useTransition isPending should stay true until the page
// unloads).
//
// This is a side effect in render. Don't try this at home, kids. It's
// probably safe because we know this is a singleton component and it's never
// in <Offscreen>. At least I hope so. (It will run twice in dev strict mode,
// but that's... fine?)
const { pushRef } = useUnwrapState(reducerState)
if (pushRef.mpaNavigation) {
// if there's a re-render, we don't want to trigger another redirect if one is already in flight to the same URL
if (globalMutable.pendingMpaPath !== canonicalUrl) {
const location = window.location
if (pushRef.pendingPush) {
location.assign(canonicalUrl)
} else {
location.replace(canonicalUrl)
}
globalMutable.pendingMpaPath = canonicalUrl
}
// TODO-APP: Should we listen to navigateerror here to catch failed
// navigations somehow? And should we call window.stop() if a SPA navigation
// should interrupt an MPA one?
use(unresolvedThenable)
}
useEffect(() => {
const originalPushState = window.history.pushState.bind(window.history)
const originalReplaceState = window.history.replaceState.bind(
window.history
)
// Ensure the canonical URL in the Next.js Router is updated when the URL is changed so that `usePathname` and `useSearchParams` hold the pushed values.
const applyUrlFromHistoryPushReplace = (
url: string | URL | null | undefined
) => {
const href = window.location.href
const tree: FlightRouterState | undefined =
window.history.state?.__PRIVATE_NEXTJS_INTERNALS_TREE
startTransition(() => {
dispatch({
type: ACTION_RESTORE,
url: new URL(url ?? href, href),
tree,
})
})
}
/**
* Patch pushState to ensure external changes to the history are reflected in the Next.js Router.
* Ensures Next.js internal history state is copied to the new history entry.
* Ensures usePathname and useSearchParams hold the newly provided url.
*/
window.history.pushState = function pushState(
data: any,
_unused: string,
url?: string | URL | null
): void {
// Avoid a loop when Next.js internals trigger pushState/replaceState
if (data?.__NA || data?._N) {
return originalPushState(data, _unused, url)
}
data = copyNextJsInternalHistoryState(data)
if (url) {
applyUrlFromHistoryPushReplace(url)
}
return originalPushState(data, _unused, url)
}
/**
* Patch replaceState to ensure external changes to the history are reflected in the Next.js Router.
* Ensures Next.js internal history state is copied to the new history entry.
* Ensures usePathname and useSearchParams hold the newly provided url.
*/
window.history.replaceState = function replaceState(
data: any,
_unused: string,
url?: string | URL | null
): void {
// Avoid a loop when Next.js internals trigger pushState/replaceState
if (data?.__NA || data?._N) {
return originalReplaceState(data, _unused, url)
}
data = copyNextJsInternalHistoryState(data)
if (url) {
applyUrlFromHistoryPushReplace(url)
}
return originalReplaceState(data, _unused, url)
}
/**
* Handle popstate event, this is used to handle back/forward in the browser.
* By default dispatches ACTION_RESTORE, however if the history entry was not pushed/replaced by app-router it will reload the page.
* That case can happen when the old router injected the history entry.
*/
const onPopState = ({ state }: PopStateEvent) => {
if (!state) {
// TODO-APP: this case only happens when pushState/replaceState was called outside of Next.js. It should probably reload the page in this case.
return
}
// This case happens when the history entry was pushed by the `pages` router.
if (!state.__NA) {
window.location.reload()
return
}
// TODO-APP: Ideally the back button should not use startTransition as it should apply the updates synchronously
// Without startTransition works if the cache is there for this path
startTransition(() => {
dispatch({
type: ACTION_RESTORE,
url: new URL(window.location.href),
tree: state.__PRIVATE_NEXTJS_INTERNALS_TREE,
})
})
}
// Register popstate event to call onPopstate.
window.addEventListener('popstate', onPopState)
return () => {
window.history.pushState = originalPushState
window.history.replaceState = originalReplaceState
window.removeEventListener('popstate', onPopState)
}
}, [dispatch])
const { cache, tree, nextUrl, focusAndScrollRef } =
useUnwrapState(reducerState)
const matchingHead = useMemo(() => {
return findHeadInCache(cache, tree[1])
}, [cache, tree])
// Add memoized pathParams for useParams.
const pathParams = useMemo(() => {
return getSelectedParams(tree)
}, [tree])
const layoutRouterContext = useMemo(() => {
return {
childNodes: cache.parallelRoutes,
tree,
// Root node always has `url`
// Provided in AppTreeContext to ensure it can be overwritten in layout-router
url: canonicalUrl,
loading: cache.loading,
}
}, [cache.parallelRoutes, tree, canonicalUrl, cache.loading])
const globalLayoutRouterContext = useMemo(() => {
return {
buildId,
changeByServerResponse,
tree,
focusAndScrollRef,
nextUrl,
}
}, [buildId, changeByServerResponse, tree, focusAndScrollRef, nextUrl])
let head
if (matchingHead !== null) {
// The head is wrapped in an extra component so we can use
// `useDeferredValue` to swap between the prefetched and final versions of
// the head. (This is what LayoutRouter does for segment data, too.)
//
// The `key` is used to remount the component whenever the head moves to
// a different segment.
const [headCacheNode, headKey] = matchingHead
head = <Head key={headKey} headCacheNode={headCacheNode} />
} else {
head = null
}
// We use `useDeferredValue` to handle switching between the prefetched and
// final values. The second argument is returned on initial render, then it
// re-renders with the first argument. We only use the prefetched layer assets
// if they are available. Otherwise, we use the non-prefetched version.
const resolvedPrefetchLayerAssets =
cache.prefetchLayerAssets !== null
? cache.prefetchLayerAssets
: cache.layerAssets
const layerAssets = useDeferredValue(
cache.layerAssets,
// @ts-expect-error The second argument to `useDeferredValue` is only
// available in the experimental builds. When its disabled, it will always
// return `cache.layerAssets`.
resolvedPrefetchLayerAssets
)
let content = (
<RedirectBoundary>
{head}
{layerAssets}
{cache.rsc}
<AppRouterAnnouncer tree={tree} />
</RedirectBoundary>
)
if (process.env.NODE_ENV !== 'production') {
if (typeof window !== 'undefined') {
const DevRootNotFoundBoundary: typeof import('./dev-root-not-found-boundary').DevRootNotFoundBoundary =
require('./dev-root-not-found-boundary').DevRootNotFoundBoundary
content = (
<DevRootNotFoundBoundary>
<MissingSlotContext.Provider value={missingSlots}>
{content}
</MissingSlotContext.Provider>
</DevRootNotFoundBoundary>
)
}
const HotReloader: typeof import('./react-dev-overlay/app/hot-reloader-client').default =
require('./react-dev-overlay/app/hot-reloader-client').default
content = <HotReloader assetPrefix={assetPrefix}>{content}</HotReloader>
}
return (
<>
<HistoryUpdater
appRouterState={useUnwrapState(reducerState)}
sync={sync}
/>
<RuntimeStyles />
<PathParamsContext.Provider value={pathParams}>
<PathnameContext.Provider value={pathname}>
<SearchParamsContext.Provider value={searchParams}>
<GlobalLayoutRouterContext.Provider
value={globalLayoutRouterContext}
>
<AppRouterContext.Provider value={appRouter}>
<LayoutRouterContext.Provider value={layoutRouterContext}>
{content}
</LayoutRouterContext.Provider>
</AppRouterContext.Provider>
</GlobalLayoutRouterContext.Provider>
</SearchParamsContext.Provider>
</PathnameContext.Provider>
</PathParamsContext.Provider>
</>
)
}
export default function AppRouter(
props: AppRouterProps & { globalErrorComponent: ErrorComponent }
) {
const { globalErrorComponent, ...rest } = props
return (
<ErrorBoundary errorComponent={globalErrorComponent}>
<Router {...rest} />
</ErrorBoundary>
)
}
const runtimeStyles = new Set<string>()
let runtimeStyleChanged = new Set<() => void>()
globalThis._N_E_STYLE_LOAD = function (href: string) {
let len = runtimeStyles.size
runtimeStyles.add(href)
if (runtimeStyles.size !== len) {
runtimeStyleChanged.forEach((cb) => cb())
}
// TODO figure out how to get a promise here
// But maybe it's not necessary as react would block rendering until it's loaded
return Promise.resolve()
}
function RuntimeStyles() {
const [, forceUpdate] = React.useState(0)
const renderedStylesSize = runtimeStyles.size
useEffect(() => {
const changed = () => forceUpdate((c) => c + 1)
runtimeStyleChanged.add(changed)
if (renderedStylesSize !== runtimeStyles.size) {
changed()
}
return () => {
runtimeStyleChanged.delete(changed)
}
}, [renderedStylesSize, forceUpdate])
const dplId = process.env.NEXT_DEPLOYMENT_ID
? `?dpl=${process.env.NEXT_DEPLOYMENT_ID}`
: ''
return [...runtimeStyles].map((href, i) => (
<link
key={i}
rel="stylesheet"
href={`${href}${dplId}`}
// @ts-ignore
precedence="next"
// TODO figure out crossOrigin and nonce
// crossOrigin={TODO}
// nonce={TODO}
/>
))
}