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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236import {useEffect, useRef} from 'react'import {View} from 'react-native'// Based on @react-navigation/native-stack/src/navigators/createNativeStackNavigator.ts// MIT License// Copyright (c) 2017 React Navigation Contributorsimport { createNavigatorFactory, type EventArg, type NavigatorTypeBagBase, type ParamListBase, type StackActionHelpers, StackActions, type StackNavigationState, StackRouter, type StackRouterOptions, type StaticConfig, type TypedNavigator, useNavigationBuilder,} from '@react-navigation/native'import {NativeStackView} from '@react-navigation/native-stack'import { type NativeStackNavigationEventMap, type NativeStackNavigationOptions, type NativeStackNavigationProp, type NativeStackNavigatorProps,} from '@react-navigation/native-stack'
import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'import {useSession} from '#/state/session'import {useOnboardingState} from '#/state/shell'import { useLoggedOutView, useLoggedOutViewControls,} from '#/state/shell/logged-out'import {LoggedOut} from '#/view/com/auth/LoggedOut'import {Onboarding} from '#/screens/Onboarding'import {SignupQueued} from '#/screens/SignupQueued'import {atoms as a, useLayoutBreakpoints} from '#/alf'import {PolicyUpdateOverlay} from '#/components/PolicyUpdateOverlay'import {IS_NATIVE, IS_WEB} from '#/env'import {BottomBarWeb} from './bottom-bar/BottomBarWeb'import {DesktopLeftNav} from './desktop/LeftNav'import {DesktopRightNav} from './desktop/RightNav'
// On web, only this many screens (beyond Home + focused) stay mounted.// Older screens are unmounted to prevent memory growth during long sessions.const WEB_MAX_CACHED_SCREENS = 5
type NativeStackNavigationOptionsWithAuth = NativeStackNavigationOptions & { requireAuth?: boolean}
function NativeStackNavigator({ id, initialRouteName, UNSTABLE_routeNamesChangeBehavior, children, layout, screenListeners, screenOptions, screenLayout, UNSTABLE_router, ...rest}: NativeStackNavigatorProps) { // --- this is copy and pasted from the original native stack navigator --- const {state, describe, descriptors, navigation, NavigationContent} = useNavigationBuilder< StackNavigationState<ParamListBase>, StackRouterOptions, StackActionHelpers<ParamListBase>, NativeStackNavigationOptionsWithAuth, NativeStackNavigationEventMap >(StackRouter, { id, initialRouteName, UNSTABLE_routeNamesChangeBehavior, children, layout, screenListeners, screenOptions, screenLayout, UNSTABLE_router, })
useEffect( () => // @ts-expect-error: there may not be a tab navigator in parent navigation?.addListener?.('tabPress', (e: any) => { const isFocused = navigation.isFocused()
// Run the operation in the next frame so we're sure all listeners have been run // This is necessary to know if preventDefault() has been called requestAnimationFrame(() => { if ( state.index > 0 && isFocused && !(e as EventArg<'tabPress', true>).defaultPrevented ) { // When user taps on already focused tab and we're inside the tab, // reset the stack to replicate native behaviour navigation.dispatch({ ...StackActions.popToTop(), target: state.key, }) } }) }), [navigation, state.index, state.key], )
// --- our custom logic starts here --- // Web LRU: tracks route keys in most-recently-focused order const lruKeysRef = useRef<string[]>([]) const {hasSession, currentAccount} = useSession() const activeRoute = state.routes[state.index] const activeDescriptor = descriptors[activeRoute.key] const activeRouteRequiresAuth = activeDescriptor.options.requireAuth ?? false const onboardingState = useOnboardingState() const {showLoggedOut} = useLoggedOutView() const {setShowLoggedOut} = useLoggedOutViewControls() const {isMobile} = useWebMediaQueries() const {leftNavMinimal} = useLayoutBreakpoints() if (!hasSession && (activeRouteRequiresAuth || IS_NATIVE)) { return <LoggedOut /> } if (hasSession && currentAccount?.signupQueued) { return <SignupQueued /> } if (showLoggedOut) { return <LoggedOut onDismiss={() => setShowLoggedOut(false)} /> } if (onboardingState.isActive) { return <Onboarding /> } // On web, limit how many screens stay mounted to prevent memory growth. // Home is always pinned, the focused screen is always mounted, and the // most recently visited screens are kept up to WEB_MAX_CACHED_SCREENS. // Evicted screens render a lightweight placeholder — the route stays in // state so browser back/forward still works; the component just re-mounts. let finalDescriptors = descriptors if (IS_WEB) { const focusedKey = activeRoute.key
// Update LRU: move focused key to front const lru = lruKeysRef.current const idx = lru.indexOf(focusedKey) if (idx > 0) { lru.splice(idx, 1) lru.unshift(focusedKey) } else if (idx === -1) { lru.unshift(focusedKey) }
// Remove keys for routes no longer in the stack const routeKeySet = new Set(state.routes.map(r => r.key)) lruKeysRef.current = lruKeysRef.current.filter(k => routeKeySet.has(k))
// Build mount set: Home (pinned) + focused + N most recent const mountSet = new Set<string>() mountSet.add(focusedKey) const homeKey = state.routes.find(r => r.name === 'Home')?.key if (homeKey) mountSet.add(homeKey) let cached = 0 for (const key of lruKeysRef.current) { if (cached >= WEB_MAX_CACHED_SCREENS) break if (!mountSet.has(key)) { mountSet.add(key) cached++ } }
// Evicted screens get a lightweight placeholder instead of their full tree finalDescriptors = {} as typeof descriptors for (const key in descriptors) { if (mountSet.has(key)) { finalDescriptors[key] = descriptors[key] } else { finalDescriptors[key] = { ...descriptors[key], render: () => <View />, } } } }
// Show the bottom bar if we have a session only on mobile web. If we don't have a session, we want to show it // on both tablet and mobile web so that we see the create account CTA. const showBottomBar = hasSession ? isMobile : leftNavMinimal
return ( <NavigationContent> <View role="main" style={a.flex_1}> <NativeStackView {...rest} state={state} navigation={navigation} descriptors={finalDescriptors} describe={describe} /> </View> {IS_WEB && ( <> {showBottomBar ? <BottomBarWeb /> : <DesktopLeftNav />} {!isMobile && <DesktopRightNav routeName={activeRoute.name} />} </> )}
{/* Only shown after logged in and onboaring etc are complete */} {hasSession && <PolicyUpdateOverlay />} </NavigationContent> )}
export function createNativeStackNavigatorWithAuth< const ParamList extends ParamListBase, const NavigatorID extends string | undefined = string | undefined, const TypeBag extends NavigatorTypeBagBase = { ParamList: ParamList NavigatorID: NavigatorID State: StackNavigationState<ParamList> ScreenOptions: NativeStackNavigationOptionsWithAuth EventMap: NativeStackNavigationEventMap NavigationList: { [RouteName in keyof ParamList]: NativeStackNavigationProp< ParamList, RouteName, NavigatorID > } Navigator: typeof NativeStackNavigator }, const Config extends StaticConfig<TypeBag> = StaticConfig<TypeBag>,>(config?: Config): TypedNavigator<TypeBag, Config> { return createNavigatorFactory(NativeStackNavigator)(config)}