inital commit

node_modules/next/dist/esm/client/components/segment-cache-impl/cache-key.js

@@ -0,0 +1,12 @@
+// TypeScript trick to simulate opaque types, like in Flow.
+export function createCacheKey(originalHref, nextUrl) {
+    const originalUrl = new URL(originalHref);
+    const cacheKey = {
+        href: originalHref,
+        search: originalUrl.search,
+        nextUrl: nextUrl
+    };
+    return cacheKey;
+}
+
+//# sourceMappingURL=cache-key.js.map

node_modules/next/dist/esm/client/components/segment-cache-impl/cache-key.js.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../../../../src/client/components/segment-cache-impl/cache-key.ts"],"sourcesContent":["// TypeScript trick to simulate opaque types, like in Flow.\ntype Opaque<K, T> = T & { __brand: K }\n\n// Only functions in this module should be allowed to create CacheKeys.\nexport type NormalizedHref = Opaque<'NormalizedHref', string>\nexport type NormalizedSearch = Opaque<'NormalizedSearch', string>\nexport type NormalizedNextUrl = Opaque<'NormalizedNextUrl', string>\n\nexport type RouteCacheKey = Opaque<\n  'RouteCacheKey',\n  {\n    href: NormalizedHref\n    search: NormalizedSearch\n    nextUrl: NormalizedNextUrl | null\n\n    // TODO: Eventually the dynamic params will be added here, too.\n  }\n>\n\nexport function createCacheKey(\n  originalHref: string,\n  nextUrl: string | null\n): RouteCacheKey {\n  const originalUrl = new URL(originalHref)\n  const cacheKey = {\n    href: originalHref as NormalizedHref,\n    search: originalUrl.search as NormalizedSearch,\n    nextUrl: nextUrl as NormalizedNextUrl | null,\n  } as RouteCacheKey\n  return cacheKey\n}\n"],"names":["createCacheKey","originalHref","nextUrl","originalUrl","URL","cacheKey","href","search"],"mappings":"AAAA,2DAA2D;AAmB3D,OAAO,SAASA,eACdC,YAAoB,EACpBC,OAAsB;IAEtB,MAAMC,cAAc,IAAIC,IAAIH;IAC5B,MAAMI,WAAW;QACfC,MAAML;QACNM,QAAQJ,YAAYI,MAAM;QAC1BL,SAASA;IACX;IACA,OAAOG;AACT"}

node_modules/next/dist/esm/client/components/segment-cache-impl/lru.js

@@ -0,0 +1,109 @@
+// Rather than create an internal LRU node, the passed-in type must conform
+// the LRUNode interface. This is just a memory optimization to avoid creating
+// another object; we only use this for Segment Cache entries so it doesn't need
+// to be general purpose.
+export function createLRU(// From the LRU's perspective, the size unit is arbitrary, but for our
+// purposes this is the byte size.
+maxLruSize, onEviction) {
+    let head = null;
+    let didScheduleCleanup = false;
+    let lruSize = 0;
+    function put(node) {
+        if (head === node) {
+            // Already at the head
+            return;
+        }
+        const prev = node.prev;
+        const next = node.next;
+        if (next === null || prev === null) {
+            // This is an insertion
+            lruSize += node.size;
+            // Whenever we add an entry, we need to check if we've exceeded the
+            // max size. We don't evict entries immediately; they're evicted later in
+            // an asynchronous task.
+            ensureCleanupIsScheduled();
+        } else {
+            // This is a move. Remove from its current position.
+            prev.next = next;
+            next.prev = prev;
+        }
+        // Move to the front of the list
+        if (head === null) {
+            // This is the first entry
+            node.prev = node;
+            node.next = node;
+        } else {
+            // Add to the front of the list
+            const tail = head.prev;
+            node.prev = tail;
+            tail.next = node;
+            node.next = head;
+            head.prev = node;
+        }
+        head = node;
+    }
+    function updateSize(node, newNodeSize) {
+        // This is a separate function from `put` so that we can resize the entry
+        // regardless of whether it's currently being tracked by the LRU.
+        const prevNodeSize = node.size;
+        node.size = newNodeSize;
+        if (node.next === null) {
+            // This entry is not currently being tracked by the LRU.
+            return;
+        }
+        // Update the total LRU size
+        lruSize = lruSize - prevNodeSize + newNodeSize;
+        ensureCleanupIsScheduled();
+    }
+    function deleteNode(deleted) {
+        const next = deleted.next;
+        const prev = deleted.prev;
+        if (next !== null && prev !== null) {
+            lruSize -= deleted.size;
+            deleted.next = null;
+            deleted.prev = null;
+            // Remove from the list
+            if (head === deleted) {
+                // Update the head
+                if (next === head) {
+                    // This was the last entry
+                    head = null;
+                } else {
+                    head = next;
+                }
+            } else {
+                prev.next = next;
+                next.prev = prev;
+            }
+        } else {
+        // Already deleted
+        }
+    }
+    function ensureCleanupIsScheduled() {
+        if (didScheduleCleanup || lruSize <= maxLruSize) {
+            return;
+        }
+        didScheduleCleanup = true;
+        requestCleanupCallback(cleanup);
+    }
+    function cleanup() {
+        didScheduleCleanup = false;
+        // Evict entries until we're at 90% capacity. We can assume this won't
+        // infinite loop because even if `maxLruSize` were 0, eventually
+        // `deleteNode` sets `head` to `null` when we run out entries.
+        const ninetyPercentMax = maxLruSize * 0.9;
+        while(lruSize > ninetyPercentMax && head !== null){
+            const tail = head.prev;
+            deleteNode(tail);
+            onEviction(tail);
+        }
+    }
+    return {
+        put,
+        delete: deleteNode,
+        updateSize
+    };
+}
+const requestCleanupCallback = typeof requestIdleCallback === 'function' ? requestIdleCallback : (cb)=>setTimeout(cb, 0);
+
+//# sourceMappingURL=lru.js.map

node_modules/next/dist/esm/client/components/segment-cache-impl/navigation.js

@@ -0,0 +1,332 @@
+import { fetchServerResponse } from '../router-reducer/fetch-server-response';
+import { startPPRNavigation, listenForDynamicRequest } from '../router-reducer/ppr-navigations';
+import { createHrefFromUrl as createCanonicalUrl } from '../router-reducer/create-href-from-url';
+import { EntryStatus, readRouteCacheEntry, readSegmentCacheEntry, waitForSegmentCacheEntry } from './cache';
+import { createCacheKey } from './cache-key';
+import { addSearchParamsIfPageSegment, PAGE_SEGMENT_KEY } from '../../../shared/lib/segment';
+import { NavigationResultTag } from '../segment-cache';
+/**
+ * Navigate to a new URL, using the Segment Cache to construct a response.
+ *
+ * To allow for synchronous navigations whenever possible, this is not an async
+ * function. It returns a promise only if there's no matching prefetch in
+ * the cache. Otherwise it returns an immediate result and uses Suspense/RSC to
+ * stream in any missing data.
+ */ export function navigate(url, currentCacheNode, currentFlightRouterState, nextUrl, shouldScroll) {
+    const now = Date.now();
+    const href = url.href;
+    // We special case navigations to the exact same URL as the current location.
+    // It's a common UI pattern for apps to refresh when you click a link to the
+    // current page. So when this happens, we refresh the dynamic data in the page
+    // segments.
+    //
+    // Note that this does not apply if the any part of the hash or search query
+    // has changed. This might feel a bit weird but it makes more sense when you
+    // consider that the way to trigger this behavior is to click the same link
+    // multiple times.
+    //
+    // TODO: We should probably refresh the *entire* route when this case occurs,
+    // not just the page segments. Essentially treating it the same as a refresh()
+    // triggered by an action, which is the more explicit way of modeling the UI
+    // pattern described above.
+    //
+    // Also note that this only refreshes the dynamic data, not static/ cached
+    // data. If the page segment is fully static and prefetched, the request is
+    // skipped. (This is also how refresh() works.)
+    const isSamePageNavigation = // TODO: This is not the only place we read from the location, but we should
+    // consider storing the current URL in the router state instead of reading
+    // from the location object. In practice I don't think this matters much
+    // since we keep them in sync anyway, but having two sources of truth can
+    // lead to subtle bugs and race conditions.
+    href === window.location.href;
+    const cacheKey = createCacheKey(href, nextUrl);
+    const route = readRouteCacheEntry(now, cacheKey);
+    if (route !== null && route.status === EntryStatus.Fulfilled) {
+        // We have a matching prefetch.
+        const snapshot = readRenderSnapshotFromCache(now, cacheKey, route.tree);
+        const prefetchFlightRouterState = snapshot.flightRouterState;
+        const prefetchSeedData = snapshot.seedData;
+        const prefetchHead = route.head;
+        const isPrefetchHeadPartial = route.isHeadPartial;
+        const newCanonicalUrl = route.canonicalUrl;
+        return navigateUsingPrefetchedRouteTree(url, nextUrl, isSamePageNavigation, currentCacheNode, currentFlightRouterState, prefetchFlightRouterState, prefetchSeedData, prefetchHead, isPrefetchHeadPartial, newCanonicalUrl, shouldScroll, url.hash);
+    }
+    // There's no matching prefetch for this route in the cache.
+    return {
+        tag: NavigationResultTag.Async,
+        data: navigateDynamicallyWithNoPrefetch(url, nextUrl, isSamePageNavigation, currentCacheNode, currentFlightRouterState, shouldScroll, url.hash)
+    };
+}
+function navigateUsingPrefetchedRouteTree(url, nextUrl, isSamePageNavigation, currentCacheNode, currentFlightRouterState, prefetchFlightRouterState, prefetchSeedData, prefetchHead, isPrefetchHeadPartial, canonicalUrl, shouldScroll, hash) {
+    // Recursively construct a prefetch tree by reading from the Segment Cache. To
+    // maintain compatibility, we output the same data structures as the old
+    // prefetching implementation: FlightRouterState and CacheNodeSeedData.
+    // TODO: Eventually updateCacheNodeOnNavigation (or the equivalent) should
+    // read from the Segment Cache directly. It's only structured this way for now
+    // so we can share code with the old prefetching implementation.
+    const scrollableSegments = [];
+    const task = startPPRNavigation(currentCacheNode, currentFlightRouterState, prefetchFlightRouterState, prefetchSeedData, prefetchHead, isPrefetchHeadPartial, isSamePageNavigation, scrollableSegments);
+    if (task !== null) {
+        const dynamicRequestTree = task.dynamicRequestTree;
+        if (dynamicRequestTree !== null) {
+            const promiseForDynamicServerResponse = fetchServerResponse(url, {
+                flightRouterState: dynamicRequestTree,
+                nextUrl
+            });
+            listenForDynamicRequest(task, promiseForDynamicServerResponse);
+        } else {
+        // The prefetched tree does not contain dynamic holes — it's
+        // fully static. We can skip the dynamic request.
+        }
+        return navigationTaskToResult(task, currentCacheNode, canonicalUrl, scrollableSegments, shouldScroll, hash);
+    }
+    // The server sent back an empty tree patch. There's nothing to update, except
+    // possibly the URL.
+    return {
+        tag: NavigationResultTag.NoOp,
+        data: {
+            canonicalUrl,
+            shouldScroll
+        }
+    };
+}
+function navigationTaskToResult(task, currentCacheNode, canonicalUrl, scrollableSegments, shouldScroll, hash) {
+    const flightRouterState = task.route;
+    if (flightRouterState === null) {
+        // When no router state is provided, it signals that we should perform an
+        // MPA navigation.
+        return {
+            tag: NavigationResultTag.MPA,
+            data: canonicalUrl
+        };
+    }
+    const newCacheNode = task.node;
+    return {
+        tag: NavigationResultTag.Success,
+        data: {
+            flightRouterState,
+            cacheNode: newCacheNode !== null ? newCacheNode : currentCacheNode,
+            canonicalUrl,
+            scrollableSegments,
+            shouldScroll,
+            hash
+        }
+    };
+}
+function readRenderSnapshotFromCache(now, routeCacheKey, tree) {
+    let childRouterStates = {};
+    let childSeedDatas = {};
+    const slots = tree.slots;
+    if (slots !== null) {
+        for(const parallelRouteKey in slots){
+            const childTree = slots[parallelRouteKey];
+            const childResult = readRenderSnapshotFromCache(now, routeCacheKey, childTree);
+            childRouterStates[parallelRouteKey] = childResult.flightRouterState;
+            childSeedDatas[parallelRouteKey] = childResult.seedData;
+        }
+    }
+    let rsc = null;
+    let loading = null;
+    let isPartial = true;
+    const segmentEntry = readSegmentCacheEntry(now, routeCacheKey, tree.key);
+    if (segmentEntry !== null) {
+        switch(segmentEntry.status){
+            case EntryStatus.Fulfilled:
+                {
+                    // Happy path: a cache hit
+                    rsc = segmentEntry.rsc;
+                    loading = segmentEntry.loading;
+                    isPartial = segmentEntry.isPartial;
+                    break;
+                }
+            case EntryStatus.Pending:
+                {
+                    // We haven't received data for this segment yet, but there's already
+                    // an in-progress request. Since it's extremely likely to arrive
+                    // before the dynamic data response, we might as well use it.
+                    const promiseForFulfilledEntry = waitForSegmentCacheEntry(segmentEntry);
+                    rsc = promiseForFulfilledEntry.then((entry)=>entry !== null ? entry.rsc : null);
+                    loading = promiseForFulfilledEntry.then((entry)=>entry !== null ? entry.loading : null);
+                    // Since we don't know yet whether the segment is partial or fully
+                    // static, we must assume it's partial; we can't skip the
+                    // dynamic request.
+                    isPartial = true;
+                    break;
+                }
+            case EntryStatus.Empty:
+            case EntryStatus.Rejected:
+                break;
+            default:
+                segmentEntry;
+        }
+    }
+    const segment = tree.segment === PAGE_SEGMENT_KEY && routeCacheKey.search ? // included in the segment. However, the Segment Cache tracks search
+    // params separately from the rest of the segment key. So we need to
+    // add them back here.
+    //
+    // See corresponding comment in convertFlightRouterStateToTree.
+    //
+    // TODO: What we should do instead is update the navigation diffing
+    // logic to compare search params explicitly. This is a temporary
+    // solution until more of the Segment Cache implementation has settled.
+    addSearchParamsIfPageSegment(tree.segment, Object.fromEntries(new URLSearchParams(routeCacheKey.search))) : tree.segment;
+    return {
+        flightRouterState: [
+            segment,
+            childRouterStates,
+            null,
+            null,
+            tree.isRootLayout
+        ],
+        seedData: [
+            segment,
+            rsc,
+            childSeedDatas,
+            loading,
+            isPartial
+        ]
+    };
+}
+async function navigateDynamicallyWithNoPrefetch(url, nextUrl, isSamePageNavigation, currentCacheNode, currentFlightRouterState, shouldScroll, hash) {
+    // Runs when a navigation happens but there's no cached prefetch we can use.
+    // Don't bother to wait for a prefetch response; go straight to a full
+    // navigation that contains both static and dynamic data in a single stream.
+    // (This is unlike the old navigation implementation, which instead blocks
+    // the dynamic request until a prefetch request is received.)
+    //
+    // To avoid duplication of logic, we're going to pretend that the tree
+    // returned by the dynamic request is, in fact, a prefetch tree. Then we can
+    // use the same server response to write the actual data into the CacheNode
+    // tree. So it's the same flow as the "happy path" (prefetch, then
+    // navigation), except we use a single server response for both stages.
+    const promiseForDynamicServerResponse = fetchServerResponse(url, {
+        flightRouterState: currentFlightRouterState,
+        nextUrl
+    });
+    const { flightData, canonicalUrl: canonicalUrlOverride } = await promiseForDynamicServerResponse;
+    if (typeof flightData === 'string') {
+        // This is an MPA navigation.
+        const newUrl = flightData;
+        return {
+            tag: NavigationResultTag.MPA,
+            data: newUrl
+        };
+    }
+    // Since the response format of dynamic requests and prefetches is slightly
+    // different, we'll need to massage the data a bit. Create FlightRouterState
+    // tree that simulates what we'd receive as the result of a prefetch.
+    const prefetchFlightRouterState = simulatePrefetchTreeUsingDynamicTreePatch(currentFlightRouterState, flightData);
+    // In our simulated prefetch payload, we pretend that there's no seed data
+    // nor a prefetch head.
+    const prefetchSeedData = null;
+    const prefetchHead = null;
+    const isPrefetchHeadPartial = true;
+    const canonicalUrl = createCanonicalUrl(canonicalUrlOverride ? canonicalUrlOverride : url);
+    // Now we proceed exactly as we would for normal navigation.
+    const scrollableSegments = [];
+    const task = startPPRNavigation(currentCacheNode, currentFlightRouterState, prefetchFlightRouterState, prefetchSeedData, prefetchHead, isPrefetchHeadPartial, isSamePageNavigation, scrollableSegments);
+    if (task !== null) {
+        // In this case, we've already sent the dynamic request, so we don't
+        // actually use the request tree created by `startPPRNavigation`,
+        // except to check if it contains dynamic holes.
+        //
+        // This is almost always true, but it could be false if all the segment data
+        // was present in the cache, but the route tree was not. E.g. navigating
+        // to a URL that was not prefetched but rewrites to a different URL
+        // that was.
+        const hasDynamicHoles = task.dynamicRequestTree !== null;
+        if (hasDynamicHoles) {
+            listenForDynamicRequest(task, promiseForDynamicServerResponse);
+        } else {
+        // The prefetched tree does not contain dynamic holes — it's
+        // fully static. We don't need to process the server response further.
+        }
+        return navigationTaskToResult(task, currentCacheNode, canonicalUrl, scrollableSegments, shouldScroll, hash);
+    }
+    // The server sent back an empty tree patch. There's nothing to update, except
+    // possibly the URL.
+    return {
+        tag: NavigationResultTag.NoOp,
+        data: {
+            canonicalUrl,
+            shouldScroll
+        }
+    };
+}
+function simulatePrefetchTreeUsingDynamicTreePatch(currentTree, flightData) {
+    // Takes the current FlightRouterState and applies the router state patch
+    // received from the server, to create a full FlightRouterState tree that we
+    // can pretend was returned by a prefetch.
+    //
+    // (It sounds similar to what applyRouterStatePatch does, but it doesn't need
+    // to handle stuff like interception routes or diffing since that will be
+    // handled later.)
+    let baseTree = currentTree;
+    for (const { segmentPath, tree: treePatch } of flightData){
+        // If the server sends us multiple tree patches, we only need to clone the
+        // base tree when applying the first patch. After the first patch, we can
+        // apply the remaining patches in place without copying.
+        const canMutateInPlace = baseTree !== currentTree;
+        baseTree = simulatePrefetchTreeUsingDynamicTreePatchImpl(baseTree, treePatch, segmentPath, canMutateInPlace, 0);
+    }
+    return baseTree;
+}
+function simulatePrefetchTreeUsingDynamicTreePatchImpl(baseRouterState, patch, segmentPath, canMutateInPlace, index) {
+    if (index === segmentPath.length) {
+        // We reached the part of the tree that we need to patch.
+        return patch;
+    }
+    // segmentPath represents the parent path of subtree. It's a repeating
+    // pattern of parallel route key and segment:
+    //
+    //   [string, Segment, string, Segment, string, Segment, ...]
+    //
+    // This path tells us which part of the base tree to apply the tree patch.
+    //
+    // NOTE: In the case of a fully dynamic request with no prefetch, we receive
+    // the FlightRouterState patch in the same request as the dynamic data.
+    // Therefore we don't need to worry about diffing the segment values; we can
+    // assume the server sent us a correct result.
+    const updatedParallelRouteKey = segmentPath[index];
+    // const segment: Segment = segmentPath[index + 1] <-- Not used, see note above
+    const baseChildren = baseRouterState[1];
+    const newChildren = {};
+    for(const parallelRouteKey in baseChildren){
+        if (parallelRouteKey === updatedParallelRouteKey) {
+            const childBaseRouterState = baseChildren[parallelRouteKey];
+            newChildren[parallelRouteKey] = simulatePrefetchTreeUsingDynamicTreePatchImpl(childBaseRouterState, patch, segmentPath, canMutateInPlace, // Advance the index by two and keep cloning until we reach
+            // the end of the segment path.
+            index + 2);
+        } else {
+            // This child is not being patched. Copy it over as-is.
+            newChildren[parallelRouteKey] = baseChildren[parallelRouteKey];
+        }
+    }
+    if (canMutateInPlace) {
+        // We can mutate the base tree in place, because the base tree is already
+        // a clone.
+        baseRouterState[1] = newChildren;
+        return baseRouterState;
+    }
+    // Clone all the fields except the children.
+    //
+    // Based on equivalent logic in apply-router-state-patch-to-tree, but should
+    // confirm whether we need to copy all of these fields. Not sure the server
+    // ever sends, e.g. the refetch marker.
+    const clone = [
+        baseRouterState[0],
+        newChildren
+    ];
+    if (2 in baseRouterState) {
+        clone[2] = baseRouterState[2];
+    }
+    if (3 in baseRouterState) {
+        clone[3] = baseRouterState[3];
+    }
+    if (4 in baseRouterState) {
+        clone[4] = baseRouterState[4];
+    }
+    return clone;
+}
+
+//# sourceMappingURL=navigation.js.map

node_modules/next/dist/esm/client/components/segment-cache-impl/prefetch.js

@@ -0,0 +1,25 @@
+import { createPrefetchURL } from '../app-router';
+import { createCacheKey } from './cache-key';
+import { schedulePrefetchTask } from './scheduler';
+import { PrefetchPriority } from '../segment-cache';
+/**
+ * Entrypoint for prefetching a URL into the Segment Cache.
+ * @param href - The URL to prefetch. Typically this will come from a <Link>,
+ * or router.prefetch. It must be validated before we attempt to prefetch it.
+ * @param nextUrl - A special header used by the server for interception routes.
+ * Roughly  corresponds to the current URL.
+ * @param treeAtTimeOfPrefetch - The FlightRouterState at the time the prefetch
+ * was requested. This is only used when PPR is disabled.
+ * @param includeDynamicData - Whether to prefetch dynamic data, in addition to
+ * static data. This is used by <Link prefetch={true}>.
+ */ export function prefetch(href, nextUrl, treeAtTimeOfPrefetch, includeDynamicData) {
+    const url = createPrefetchURL(href);
+    if (url === null) {
+        // This href should not be prefetched.
+        return;
+    }
+    const cacheKey = createCacheKey(url.href, nextUrl);
+    schedulePrefetchTask(cacheKey, treeAtTimeOfPrefetch, includeDynamicData, PrefetchPriority.Default);
+}
+
+//# sourceMappingURL=prefetch.js.map

node_modules/next/dist/esm/client/components/segment-cache-impl/prefetch.js.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../../../../src/client/components/segment-cache-impl/prefetch.ts"],"sourcesContent":["import type { FlightRouterState } from '../../../server/app-render/types'\nimport { createPrefetchURL } from '../app-router'\nimport { createCacheKey } from './cache-key'\nimport { schedulePrefetchTask } from './scheduler'\nimport { PrefetchPriority } from '../segment-cache'\n\n/**\n * Entrypoint for prefetching a URL into the Segment Cache.\n * @param href - The URL to prefetch. Typically this will come from a <Link>,\n * or router.prefetch. It must be validated before we attempt to prefetch it.\n * @param nextUrl - A special header used by the server for interception routes.\n * Roughly  corresponds to the current URL.\n * @param treeAtTimeOfPrefetch - The FlightRouterState at the time the prefetch\n * was requested. This is only used when PPR is disabled.\n * @param includeDynamicData - Whether to prefetch dynamic data, in addition to\n * static data. This is used by <Link prefetch={true}>.\n */\nexport function prefetch(\n  href: string,\n  nextUrl: string | null,\n  treeAtTimeOfPrefetch: FlightRouterState,\n  includeDynamicData: boolean\n) {\n  const url = createPrefetchURL(href)\n  if (url === null) {\n    // This href should not be prefetched.\n    return\n  }\n  const cacheKey = createCacheKey(url.href, nextUrl)\n  schedulePrefetchTask(\n    cacheKey,\n    treeAtTimeOfPrefetch,\n    includeDynamicData,\n    PrefetchPriority.Default\n  )\n}\n"],"names":["createPrefetchURL","createCacheKey","schedulePrefetchTask","PrefetchPriority","prefetch","href","nextUrl","treeAtTimeOfPrefetch","includeDynamicData","url","cacheKey","Default"],"mappings":"AACA,SAASA,iBAAiB,QAAQ,gBAAe;AACjD,SAASC,cAAc,QAAQ,cAAa;AAC5C,SAASC,oBAAoB,QAAQ,cAAa;AAClD,SAASC,gBAAgB,QAAQ,mBAAkB;AAEnD;;;;;;;;;;CAUC,GACD,OAAO,SAASC,SACdC,IAAY,EACZC,OAAsB,EACtBC,oBAAuC,EACvCC,kBAA2B;IAE3B,MAAMC,MAAMT,kBAAkBK;IAC9B,IAAII,QAAQ,MAAM;QAChB,sCAAsC;QACtC;IACF;IACA,MAAMC,WAAWT,eAAeQ,IAAIJ,IAAI,EAAEC;IAC1CJ,qBACEQ,UACAH,sBACAC,oBACAL,iBAAiBQ,OAAO;AAE5B"}

node_modules/next/dist/esm/client/components/segment-cache-impl/scheduler.js

@@ -0,0 +1,817 @@
+import { matchSegment } from '../match-segments';
+import { readOrCreateRouteCacheEntry, readOrCreateSegmentCacheEntry, fetchRouteOnCacheMiss, fetchSegmentOnCacheMiss, EntryStatus, fetchSegmentPrefetchesUsingDynamicRequest, convertRouteTreeToFlightRouterState, FetchStrategy, readOrCreateRevalidatingSegmentEntry, upsertSegmentEntry, upgradeToPendingSegment, waitForSegmentCacheEntry, resetRevalidatingSegmentEntry, getSegmentKeypathForTask } from './cache';
+import { PrefetchPriority } from '../segment-cache';
+const scheduleMicrotask = typeof queueMicrotask === 'function' ? queueMicrotask : (fn)=>Promise.resolve().then(fn).catch((error)=>setTimeout(()=>{
+            throw error;
+        }));
+;
+;
+const taskHeap = [];
+// This is intentionally low so that when a navigation happens, the browser's
+// internal network queue is not already saturated with prefetch requests.
+const MAX_CONCURRENT_PREFETCH_REQUESTS = 3;
+let inProgressRequests = 0;
+let sortIdCounter = 0;
+let didScheduleMicrotask = false;
+/**
+ * Initiates a prefetch task for the given URL. If a prefetch for the same URL
+ * is already in progress, this will bump it to the top of the queue.
+ *
+ * This is not a user-facing function. By the time this is called, the href is
+ * expected to be validated and normalized.
+ *
+ * @param key The RouteCacheKey to prefetch.
+ * @param treeAtTimeOfPrefetch The app's current FlightRouterState
+ * @param includeDynamicData Whether to prefetch dynamic data, in addition to
+ * static data. This is used by <Link prefetch={true}>.
+ */ export function schedulePrefetchTask(key, treeAtTimeOfPrefetch, includeDynamicData, priority) {
+    // Spawn a new prefetch task
+    const task = {
+        key,
+        treeAtTimeOfPrefetch,
+        priority,
+        phase: 1,
+        hasBackgroundWork: false,
+        includeDynamicData,
+        sortId: sortIdCounter++,
+        isCanceled: false,
+        _heapIndex: -1
+    };
+    heapPush(taskHeap, task);
+    // Schedule an async task to process the queue.
+    //
+    // The main reason we process the queue in an async task is for batching.
+    // It's common for a single JS task/event to trigger multiple prefetches.
+    // By deferring to a microtask, we only process the queue once per JS task.
+    // If they have different priorities, it also ensures they are processed in
+    // the optimal order.
+    ensureWorkIsScheduled();
+    return task;
+}
+export function cancelPrefetchTask(task) {
+    // Remove the prefetch task from the queue. If the task already completed,
+    // then this is a no-op.
+    //
+    // We must also explicitly mark the task as canceled so that a blocked task
+    // does not get added back to the queue when it's pinged by the network.
+    task.isCanceled = true;
+    heapDelete(taskHeap, task);
+}
+export function bumpPrefetchTask(task, priority) {
+    // Bump the prefetch task to the top of the queue, as if it were a fresh
+    // task. This is essentially the same as canceling the task and scheduling
+    // a new one, except it reuses the original object.
+    //
+    // The primary use case is to increase the priority of a Link-initated
+    // prefetch on hover.
+    // Un-cancel the task, in case it was previously canceled.
+    task.isCanceled = false;
+    // Assign a new sort ID to move it ahead of all other tasks at the same
+    // priority level. (Higher sort IDs are processed first.)
+    task.sortId = sortIdCounter++;
+    task.priority = priority;
+    if (task._heapIndex !== -1) {
+        // The task is already in the queue.
+        heapResift(taskHeap, task);
+    } else {
+        heapPush(taskHeap, task);
+    }
+    ensureWorkIsScheduled();
+}
+function ensureWorkIsScheduled() {
+    if (didScheduleMicrotask || !hasNetworkBandwidth()) {
+        // Either we already scheduled a task to process the queue, or there are
+        // too many concurrent requests in progress. In the latter case, the
+        // queue will resume processing once more bandwidth is available.
+        return;
+    }
+    didScheduleMicrotask = true;
+    scheduleMicrotask(processQueueInMicrotask);
+}
+/**
+ * Checks if we've exceeded the maximum number of concurrent prefetch requests,
+ * to avoid saturating the browser's internal network queue. This is a
+ * cooperative limit — prefetch tasks should check this before issuing
+ * new requests.
+ */ function hasNetworkBandwidth() {
+    // TODO: Also check if there's an in-progress navigation. We should never
+    // add prefetch requests to the network queue if an actual navigation is
+    // taking place, to ensure there's sufficient bandwidth for render-blocking
+    // data and resources.
+    return inProgressRequests < MAX_CONCURRENT_PREFETCH_REQUESTS;
+}
+function spawnPrefetchSubtask(prefetchSubtask) {
+    // When the scheduler spawns an async task, we don't await its result.
+    // Instead, the async task writes its result directly into the cache, then
+    // pings the scheduler to continue.
+    //
+    // We process server responses streamingly, so the prefetch subtask will
+    // likely resolve before we're finished receiving all the data. The subtask
+    // result includes a promise that resolves once the network connection is
+    // closed. The scheduler uses this to control network bandwidth by tracking
+    // and limiting the number of concurrent requests.
+    inProgressRequests++;
+    return prefetchSubtask.then((result)=>{
+        if (result === null) {
+            // The prefetch task errored before it could start processing the
+            // network stream. Assume the connection is closed.
+            onPrefetchConnectionClosed();
+            return null;
+        }
+        // Wait for the connection to close before freeing up more bandwidth.
+        result.closed.then(onPrefetchConnectionClosed);
+        return result.value;
+    });
+}
+function onPrefetchConnectionClosed() {
+    inProgressRequests--;
+    // Notify the scheduler that we have more bandwidth, and can continue
+    // processing tasks.
+    ensureWorkIsScheduled();
+}
+/**
+ * Notify the scheduler that we've received new data for an in-progress
+ * prefetch. The corresponding task will be added back to the queue (unless the
+ * task has been canceled in the meantime).
+ */ export function pingPrefetchTask(task) {
+    // "Ping" a prefetch that's already in progress to notify it of new data.
+    if (// Check if prefetch was canceled.
+    task.isCanceled || // Check if prefetch is already queued.
+    task._heapIndex !== -1) {
+        return;
+    }
+    // Add the task back to the queue.
+    heapPush(taskHeap, task);
+    ensureWorkIsScheduled();
+}
+function processQueueInMicrotask() {
+    didScheduleMicrotask = false;
+    // We aim to minimize how often we read the current time. Since nearly all
+    // functions in the prefetch scheduler are synchronous, we can read the time
+    // once and pass it as an argument wherever it's needed.
+    const now = Date.now();
+    // Process the task queue until we run out of network bandwidth.
+    let task = heapPeek(taskHeap);
+    while(task !== null && hasNetworkBandwidth()){
+        const route = readOrCreateRouteCacheEntry(now, task);
+        const exitStatus = pingRootRouteTree(now, task, route);
+        // The `hasBackgroundWork` field is only valid for a single attempt. Reset
+        // it immediately upon exit.
+        const hasBackgroundWork = task.hasBackgroundWork;
+        task.hasBackgroundWork = false;
+        switch(exitStatus){
+            case 0:
+                // The task yielded because there are too many requests in progress.
+                // Stop processing tasks until we have more bandwidth.
+                return;
+            case 1:
+                // The task is blocked. It needs more data before it can proceed.
+                // Keep the task out of the queue until the server responds.
+                heapPop(taskHeap);
+                // Continue to the next task
+                task = heapPeek(taskHeap);
+                continue;
+            case 2:
+                if (task.phase === 1) {
+                    // Finished prefetching the route tree. Proceed to prefetching
+                    // the segments.
+                    task.phase = 0;
+                    heapResift(taskHeap, task);
+                } else if (hasBackgroundWork) {
+                    // The task spawned additional background work. Reschedule the task
+                    // at background priority.
+                    task.priority = PrefetchPriority.Background;
+                    heapResift(taskHeap, task);
+                } else {
+                    // The prefetch is complete. Continue to the next task.
+                    heapPop(taskHeap);
+                }
+                task = heapPeek(taskHeap);
+                continue;
+            default:
+                exitStatus;
+        }
+    }
+}
+/**
+ * Check this during a prefetch task to determine if background work can be
+ * performed. If so, it evaluates to `true`. Otherwise, it returns `false`,
+ * while also scheduling a background task to run later. Usage:
+ *
+ * @example
+ * if (background(task)) {
+ *   // Perform background-pri work
+ * }
+ */ function background(task) {
+    if (task.priority === PrefetchPriority.Background) {
+        return true;
+    }
+    task.hasBackgroundWork = true;
+    return false;
+}
+function pingRootRouteTree(now, task, route) {
+    switch(route.status){
+        case EntryStatus.Empty:
+            {
+                // Route is not yet cached, and there's no request already in progress.
+                // Spawn a task to request the route, load it into the cache, and ping
+                // the task to continue.
+                // TODO: There are multiple strategies in the <Link> API for prefetching
+                // a route. Currently we've only implemented the main one: per-segment,
+                // static-data only.
+                //
+                // There's also <Link prefetch={true}> which prefetches both static *and*
+                // dynamic data. Similarly, we need to fallback to the old, per-page
+                // behavior if PPR is disabled for a route (via the incremental opt-in).
+                //
+                // Those cases will be handled here.
+                spawnPrefetchSubtask(fetchRouteOnCacheMiss(route, task));
+                // If the request takes longer than a minute, a subsequent request should
+                // retry instead of waiting for this one. When the response is received,
+                // this value will be replaced by a new value based on the stale time sent
+                // from the server.
+                // TODO: We should probably also manually abort the fetch task, to reclaim
+                // server bandwidth.
+                route.staleAt = now + 60 * 1000;
+                // Upgrade to Pending so we know there's already a request in progress
+                route.status = EntryStatus.Pending;
+            // Intentional fallthrough to the Pending branch
+            }
+        case EntryStatus.Pending:
+            {
+                // Still pending. We can't start prefetching the segments until the route
+                // tree has loaded. Add the task to the set of blocked tasks so that it
+                // is notified when the route tree is ready.
+                const blockedTasks = route.blockedTasks;
+                if (blockedTasks === null) {
+                    route.blockedTasks = new Set([
+                        task
+                    ]);
+                } else {
+                    blockedTasks.add(task);
+                }
+                return 1;
+            }
+        case EntryStatus.Rejected:
+            {
+                // Route tree failed to load. Treat as a 404.
+                return 2;
+            }
+        case EntryStatus.Fulfilled:
+            {
+                if (task.phase !== 0) {
+                    // Do not prefetch segment data until we've entered the segment phase.
+                    return 2;
+                }
+                // Recursively fill in the segment tree.
+                if (!hasNetworkBandwidth()) {
+                    // Stop prefetching segments until there's more bandwidth.
+                    return 0;
+                }
+                const tree = route.tree;
+                // Determine which fetch strategy to use for this prefetch task.
+                const fetchStrategy = task.includeDynamicData ? FetchStrategy.Full : route.isPPREnabled ? FetchStrategy.PPR : FetchStrategy.LoadingBoundary;
+                switch(fetchStrategy){
+                    case FetchStrategy.PPR:
+                        // Individually prefetch the static shell for each segment. This is
+                        // the default prefetching behavior for static routes, or when PPR is
+                        // enabled. It will not include any dynamic data.
+                        return pingPPRRouteTree(now, task, route, tree);
+                    case FetchStrategy.Full:
+                    case FetchStrategy.LoadingBoundary:
+                        {
+                            // Prefetch multiple segments using a single dynamic request.
+                            const spawnedEntries = new Map();
+                            const dynamicRequestTree = diffRouteTreeAgainstCurrent(now, task, route, task.treeAtTimeOfPrefetch, tree, spawnedEntries, fetchStrategy);
+                            const needsDynamicRequest = spawnedEntries.size > 0;
+                            if (needsDynamicRequest) {
+                                // Perform a dynamic prefetch request and populate the cache with
+                                // the result
+                                spawnPrefetchSubtask(fetchSegmentPrefetchesUsingDynamicRequest(task, route, fetchStrategy, dynamicRequestTree, spawnedEntries));
+                            }
+                            return 2;
+                        }
+                    default:
+                        fetchStrategy;
+                }
+                break;
+            }
+        default:
+            {
+                route;
+            }
+    }
+    return 2;
+}
+function pingPPRRouteTree(now, task, route, tree) {
+    const segment = readOrCreateSegmentCacheEntry(now, task, route, tree.key);
+    pingPerSegment(now, task, route, segment, task.key, tree.key);
+    if (tree.slots !== null) {
+        if (!hasNetworkBandwidth()) {
+            // Stop prefetching segments until there's more bandwidth.
+            return 0;
+        }
+        // Recursively ping the children.
+        for(const parallelRouteKey in tree.slots){
+            const childTree = tree.slots[parallelRouteKey];
+            const childExitStatus = pingPPRRouteTree(now, task, route, childTree);
+            if (childExitStatus === 0) {
+                // Child yielded without finishing.
+                return 0;
+            }
+        }
+    }
+    // This segment and all its children have finished prefetching.
+    return 2;
+}
+function diffRouteTreeAgainstCurrent(now, task, route, oldTree, newTree, spawnedEntries, fetchStrategy) {
+    // This is a single recursive traversal that does multiple things:
+    // - Finds the parts of the target route (newTree) that are not part of
+    //   of the current page (oldTree) by diffing them, using the same algorithm
+    //   as a real navigation.
+    // - Constructs a request tree (FlightRouterState) that describes which
+    //   segments need to be prefetched and which ones are already cached.
+    // - Creates a set of pending cache entries for the segments that need to
+    //   be prefetched, so that a subsequent prefetch task does not request the
+    //   same segments again.
+    const oldTreeChildren = oldTree[1];
+    const newTreeChildren = newTree.slots;
+    let requestTreeChildren = {};
+    if (newTreeChildren !== null) {
+        for(const parallelRouteKey in newTreeChildren){
+            const newTreeChild = newTreeChildren[parallelRouteKey];
+            const newTreeChildSegment = newTreeChild.segment;
+            const oldTreeChild = oldTreeChildren[parallelRouteKey];
+            const oldTreeChildSegment = oldTreeChild == null ? void 0 : oldTreeChild[0];
+            if (oldTreeChildSegment !== undefined && matchSegment(newTreeChildSegment, oldTreeChildSegment)) {
+                // This segment is already part of the current route. Keep traversing.
+                const requestTreeChild = diffRouteTreeAgainstCurrent(now, task, route, oldTreeChild, newTreeChild, spawnedEntries, fetchStrategy);
+                requestTreeChildren[parallelRouteKey] = requestTreeChild;
+            } else {
+                // This segment is not part of the current route. We're entering a
+                // part of the tree that we need to prefetch (unless everything is
+                // already cached).
+                switch(fetchStrategy){
+                    case FetchStrategy.LoadingBoundary:
+                        {
+                            // When PPR is disabled, we can't prefetch per segment. We must
+                            // fallback to the old prefetch behavior and send a dynamic request.
+                            // Only routes that include a loading boundary can be prefetched in
+                            // this way.
+                            //
+                            // This is simlar to a "full" prefetch, but we're much more
+                            // conservative about which segments to include in the request.
+                            //
+                            // The server will only render up to the first loading boundary
+                            // inside new part of the tree. If there's no loading boundary, the
+                            // server will never return any data. TODO: When we prefetch the
+                            // route tree, the server should indicate whether there's a loading
+                            // boundary so the client doesn't send a second request for no
+                            // reason.
+                            const requestTreeChild = pingPPRDisabledRouteTreeUpToLoadingBoundary(now, task, route, newTreeChild, null, spawnedEntries);
+                            requestTreeChildren[parallelRouteKey] = requestTreeChild;
+                            break;
+                        }
+                    case FetchStrategy.Full:
+                        {
+                            // This is a "full" prefetch. Fetch all the data in the tree, both
+                            // static and dynamic. We issue roughly the same request that we
+                            // would during a real navigation. The goal is that once the
+                            // navigation occurs, the router should not have to fetch any
+                            // additional data.
+                            //
+                            // Although the response will include dynamic data, opting into a
+                            // Full prefetch — via <Link prefetch={true}> — implicitly
+                            // instructs the cache to treat the response as "static", or non-
+                            // dynamic, since the whole point is to cache it for
+                            // future navigations.
+                            //
+                            // Construct a tree (currently a FlightRouterState) that represents
+                            // which segments need to be prefetched and which ones are already
+                            // cached. If the tree is empty, then we can exit. Otherwise, we'll
+                            // send the request tree to the server and use the response to
+                            // populate the segment cache.
+                            const requestTreeChild = pingRouteTreeAndIncludeDynamicData(now, task, route, newTreeChild, false, spawnedEntries);
+                            requestTreeChildren[parallelRouteKey] = requestTreeChild;
+                            break;
+                        }
+                    default:
+                        fetchStrategy;
+                }
+            }
+        }
+    }
+    const requestTree = [
+        newTree.segment,
+        requestTreeChildren,
+        null,
+        null,
+        newTree.isRootLayout
+    ];
+    return requestTree;
+}
+function pingPPRDisabledRouteTreeUpToLoadingBoundary(now, task, route, tree, refetchMarkerContext, spawnedEntries) {
+    // This function is similar to pingRouteTreeAndIncludeDynamicData, except the
+    // server is only going to return a minimal loading state — it will stop
+    // rendering at the first loading boundary. Whereas a Full prefetch is
+    // intentionally aggressive and tries to pretfetch all the data that will be
+    // needed for a navigation, a LoadingBoundary prefetch is much more
+    // conservative. For example, it will omit from the request tree any segment
+    // that is already cached, regardles of whether it's partial or full. By
+    // contrast, a Full prefetch will refetch partial segments.
+    // "inside-shared-layout" tells the server where to start looking for a
+    // loading boundary.
+    let refetchMarker = refetchMarkerContext === null ? 'inside-shared-layout' : null;
+    const segment = readOrCreateSegmentCacheEntry(now, task, route, tree.key);
+    switch(segment.status){
+        case EntryStatus.Empty:
+            {
+                // This segment is not cached. Add a refetch marker so the server knows
+                // to start rendering here.
+                // TODO: Instead of a "refetch" marker, we could just omit this subtree's
+                // FlightRouterState from the request tree. I think this would probably
+                // already work even without any updates to the server. For consistency,
+                // though, I'll send the full tree and we'll look into this later as part
+                // of a larger redesign of the request protocol.
+                // Add the pending cache entry to the result map.
+                spawnedEntries.set(tree.key, upgradeToPendingSegment(segment, // Set the fetch strategy to LoadingBoundary to indicate that the server
+                // might not include it in the pending response. If another route is able
+                // to issue a per-segment request, we'll do that in the background.
+                FetchStrategy.LoadingBoundary));
+                if (refetchMarkerContext !== 'refetch') {
+                    refetchMarker = refetchMarkerContext = 'refetch';
+                } else {
+                // There's already a parent with a refetch marker, so we don't need
+                // to add another one.
+                }
+                break;
+            }
+        case EntryStatus.Fulfilled:
+            {
+                // The segment is already cached.
+                // TODO: The server should include a `hasLoading` field as part of the
+                // route tree prefetch.
+                if (segment.loading !== null) {
+                    // This segment has a loading boundary, which means the server won't
+                    // render its children. So there's nothing left to prefetch along this
+                    // path. We can bail out.
+                    return convertRouteTreeToFlightRouterState(tree);
+                }
+                break;
+            }
+        case EntryStatus.Pending:
+            {
+                break;
+            }
+        case EntryStatus.Rejected:
+            {
+                break;
+            }
+        default:
+            segment;
+    }
+    const requestTreeChildren = {};
+    if (tree.slots !== null) {
+        for(const parallelRouteKey in tree.slots){
+            const childTree = tree.slots[parallelRouteKey];
+            requestTreeChildren[parallelRouteKey] = pingPPRDisabledRouteTreeUpToLoadingBoundary(now, task, route, childTree, refetchMarkerContext, spawnedEntries);
+        }
+    }
+    const requestTree = [
+        tree.segment,
+        requestTreeChildren,
+        null,
+        refetchMarker,
+        tree.isRootLayout
+    ];
+    return requestTree;
+}
+function pingRouteTreeAndIncludeDynamicData(now, task, route, tree, isInsideRefetchingParent, spawnedEntries) {
+    // The tree we're constructing is the same shape as the tree we're navigating
+    // to. But even though this is a "new" tree, some of the individual segments
+    // may be cached as a result of other route prefetches.
+    //
+    // So we need to find the first uncached segment along each path add an
+    // explicit "refetch" marker so the server knows where to start rendering.
+    // Once the server starts rendering along a path, it keeps rendering the
+    // entire subtree.
+    const segment = readOrCreateSegmentCacheEntry(now, task, route, tree.key);
+    let spawnedSegment = null;
+    switch(segment.status){
+        case EntryStatus.Empty:
+            {
+                // This segment is not cached. Include it in the request.
+                spawnedSegment = upgradeToPendingSegment(segment, FetchStrategy.Full);
+                break;
+            }
+        case EntryStatus.Fulfilled:
+            {
+                // The segment is already cached.
+                if (segment.isPartial) {
+                    // The cached segment contians dynamic holes. Since this is a Full
+                    // prefetch, we need to include it in the request.
+                    spawnedSegment = pingFullSegmentRevalidation(now, task, route, segment, tree.key);
+                }
+                break;
+            }
+        case EntryStatus.Pending:
+        case EntryStatus.Rejected:
+            {
+                // There's either another prefetch currently in progress, or the previous
+                // attempt failed. If it wasn't a Full prefetch, fetch it again.
+                if (segment.fetchStrategy !== FetchStrategy.Full) {
+                    spawnedSegment = pingFullSegmentRevalidation(now, task, route, segment, tree.key);
+                }
+                break;
+            }
+        default:
+            segment;
+    }
+    const requestTreeChildren = {};
+    if (tree.slots !== null) {
+        for(const parallelRouteKey in tree.slots){
+            const childTree = tree.slots[parallelRouteKey];
+            requestTreeChildren[parallelRouteKey] = pingRouteTreeAndIncludeDynamicData(now, task, route, childTree, isInsideRefetchingParent || spawnedSegment !== null, spawnedEntries);
+        }
+    }
+    if (spawnedSegment !== null) {
+        // Add the pending entry to the result map.
+        spawnedEntries.set(tree.key, spawnedSegment);
+    }
+    // Don't bother to add a refetch marker if one is already present in a parent.
+    const refetchMarker = !isInsideRefetchingParent && spawnedSegment !== null ? 'refetch' : null;
+    const requestTree = [
+        tree.segment,
+        requestTreeChildren,
+        null,
+        refetchMarker,
+        tree.isRootLayout
+    ];
+    return requestTree;
+}
+function pingPerSegment(now, task, route, segment, routeKey, segmentKey) {
+    switch(segment.status){
+        case EntryStatus.Empty:
+            // Upgrade to Pending so we know there's already a request in progress
+            spawnPrefetchSubtask(fetchSegmentOnCacheMiss(route, upgradeToPendingSegment(segment, FetchStrategy.PPR), routeKey, segmentKey));
+            break;
+        case EntryStatus.Pending:
+            {
+                // There's already a request in progress. Depending on what kind of
+                // request it is, we may want to revalidate it.
+                switch(segment.fetchStrategy){
+                    case FetchStrategy.PPR:
+                    case FetchStrategy.Full:
+                        break;
+                    case FetchStrategy.LoadingBoundary:
+                        // There's a pending request, but because it's using the old
+                        // prefetching strategy, we can't be sure if it will be fulfilled by
+                        // the response — it might be inside the loading boundary. Perform
+                        // a revalidation, but because it's speculative, wait to do it at
+                        // background priority.
+                        if (background(task)) {
+                            // TODO: Instead of speculatively revalidating, consider including
+                            // `hasLoading` in the route tree prefetch response.
+                            pingPPRSegmentRevalidation(now, task, segment, route, routeKey, segmentKey);
+                        }
+                        break;
+                    default:
+                        segment.fetchStrategy;
+                }
+                break;
+            }
+        case EntryStatus.Rejected:
+            {
+                // The existing entry in the cache was rejected. Depending on how it
+                // was originally fetched, we may or may not want to revalidate it.
+                switch(segment.fetchStrategy){
+                    case FetchStrategy.PPR:
+                    case FetchStrategy.Full:
+                        break;
+                    case FetchStrategy.LoadingBoundary:
+                        // There's a rejected entry, but it was fetched using the loading
+                        // boundary strategy. So the reason it wasn't returned by the server
+                        // might just be because it was inside a loading boundary. Or because
+                        // there was a dynamic rewrite. Revalidate it using the per-
+                        // segment strategy.
+                        //
+                        // Because a rejected segment will definitely prevent the segment (and
+                        // all of its children) from rendering, we perform this revalidation
+                        // immediately instead of deferring it to a background task.
+                        pingPPRSegmentRevalidation(now, task, segment, route, routeKey, segmentKey);
+                        break;
+                    default:
+                        segment.fetchStrategy;
+                }
+                break;
+            }
+        case EntryStatus.Fulfilled:
+            break;
+        default:
+            segment;
+    }
+// Segments do not have dependent tasks, so once the prefetch is initiated,
+// there's nothing else for us to do (except write the server data into the
+// entry, which is handled by `fetchSegmentOnCacheMiss`).
+}
+function pingPPRSegmentRevalidation(now, task, currentSegment, route, routeKey, segmentKey) {
+    const revalidatingSegment = readOrCreateRevalidatingSegmentEntry(now, currentSegment);
+    switch(revalidatingSegment.status){
+        case EntryStatus.Empty:
+            // Spawn a prefetch request and upsert the segment into the cache
+            // upon completion.
+            upsertSegmentOnCompletion(task, route, segmentKey, spawnPrefetchSubtask(fetchSegmentOnCacheMiss(route, upgradeToPendingSegment(revalidatingSegment, FetchStrategy.PPR), routeKey, segmentKey)));
+            break;
+        case EntryStatus.Pending:
+            break;
+        case EntryStatus.Fulfilled:
+        case EntryStatus.Rejected:
+            break;
+        default:
+            revalidatingSegment;
+    }
+}
+function pingFullSegmentRevalidation(now, task, route, currentSegment, segmentKey) {
+    const revalidatingSegment = readOrCreateRevalidatingSegmentEntry(now, currentSegment);
+    if (revalidatingSegment.status === EntryStatus.Empty) {
+        // During a Full prefetch, a single dynamic request is made for all the
+        // segments that we need. So we don't initiate a request here directly. By
+        // returning a pending entry from this function, it signals to the caller
+        // that this segment should be included in the request that's sent to
+        // the server.
+        const pendingSegment = upgradeToPendingSegment(revalidatingSegment, FetchStrategy.Full);
+        upsertSegmentOnCompletion(task, route, segmentKey, waitForSegmentCacheEntry(pendingSegment));
+        return pendingSegment;
+    } else {
+        // There's already a revalidation in progress.
+        const nonEmptyRevalidatingSegment = revalidatingSegment;
+        if (nonEmptyRevalidatingSegment.fetchStrategy !== FetchStrategy.Full) {
+            // The existing revalidation was not fetched using the Full strategy.
+            // Reset it and start a new revalidation.
+            const emptySegment = resetRevalidatingSegmentEntry(nonEmptyRevalidatingSegment);
+            const pendingSegment = upgradeToPendingSegment(emptySegment, FetchStrategy.Full);
+            upsertSegmentOnCompletion(task, route, segmentKey, waitForSegmentCacheEntry(pendingSegment));
+            return pendingSegment;
+        }
+        switch(nonEmptyRevalidatingSegment.status){
+            case EntryStatus.Pending:
+                // There's already an in-progress prefetch that includes this segment.
+                return null;
+            case EntryStatus.Fulfilled:
+            case EntryStatus.Rejected:
+                // A previous revalidation attempt finished, but we chose not to replace
+                // the existing entry in the cache. Don't try again until or unless the
+                // revalidation entry expires.
+                return null;
+            default:
+                nonEmptyRevalidatingSegment;
+                return null;
+        }
+    }
+}
+const noop = ()=>{};
+function upsertSegmentOnCompletion(task, route, key, promise) {
+    // Wait for a segment to finish loading, then upsert it into the cache
+    promise.then((fulfilled)=>{
+        if (fulfilled !== null) {
+            // Received new data. Attempt to replace the existing entry in the cache.
+            const keypath = getSegmentKeypathForTask(task, route, key);
+            upsertSegmentEntry(Date.now(), keypath, fulfilled);
+        }
+    }, noop);
+}
+// -----------------------------------------------------------------------------
+// The remainder of the module is a MinHeap implementation. Try not to put any
+// logic below here unless it's related to the heap algorithm. We can extract
+// this to a separate module if/when we need multiple kinds of heaps.
+// -----------------------------------------------------------------------------
+function compareQueuePriority(a, b) {
+    // Since the queue is a MinHeap, this should return a positive number if b is
+    // higher priority than a, and a negative number if a is higher priority
+    // than b.
+    // `priority` is an integer, where higher numbers are higher priority.
+    const priorityDiff = b.priority - a.priority;
+    if (priorityDiff !== 0) {
+        return priorityDiff;
+    }
+    // If the priority is the same, check which phase the prefetch is in — is it
+    // prefetching the route tree, or the segments? Route trees are prioritized.
+    const phaseDiff = b.phase - a.phase;
+    if (phaseDiff !== 0) {
+        return phaseDiff;
+    }
+    // Finally, check the insertion order. `sortId` is an incrementing counter
+    // assigned to prefetches. We want to process the newest prefetches first.
+    return b.sortId - a.sortId;
+}
+function heapPush(heap, node) {
+    const index = heap.length;
+    heap.push(node);
+    node._heapIndex = index;
+    heapSiftUp(heap, node, index);
+}
+function heapPeek(heap) {
+    return heap.length === 0 ? null : heap[0];
+}
+function heapPop(heap) {
+    if (heap.length === 0) {
+        return null;
+    }
+    const first = heap[0];
+    first._heapIndex = -1;
+    const last = heap.pop();
+    if (last !== first) {
+        heap[0] = last;
+        last._heapIndex = 0;
+        heapSiftDown(heap, last, 0);
+    }
+    return first;
+}
+function heapDelete(heap, node) {
+    const index = node._heapIndex;
+    if (index !== -1) {
+        node._heapIndex = -1;
+        if (heap.length !== 0) {
+            const last = heap.pop();
+            if (last !== node) {
+                heap[index] = last;
+                last._heapIndex = index;
+                heapSiftDown(heap, last, index);
+            }
+        }
+    }
+}
+function heapResift(heap, node) {
+    const index = node._heapIndex;
+    if (index !== -1) {
+        if (index === 0) {
+            heapSiftDown(heap, node, 0);
+        } else {
+            const parentIndex = index - 1 >>> 1;
+            const parent = heap[parentIndex];
+            if (compareQueuePriority(parent, node) > 0) {
+                // The parent is larger. Sift up.
+                heapSiftUp(heap, node, index);
+            } else {
+                // The parent is smaller (or equal). Sift down.
+                heapSiftDown(heap, node, index);
+            }
+        }
+    }
+}
+function heapSiftUp(heap, node, i) {
+    let index = i;
+    while(index > 0){
+        const parentIndex = index - 1 >>> 1;
+        const parent = heap[parentIndex];
+        if (compareQueuePriority(parent, node) > 0) {
+            // The parent is larger. Swap positions.
+            heap[parentIndex] = node;
+            node._heapIndex = parentIndex;
+            heap[index] = parent;
+            parent._heapIndex = index;
+            index = parentIndex;
+        } else {
+            // The parent is smaller. Exit.
+            return;
+        }
+    }
+}
+function heapSiftDown(heap, node, i) {
+    let index = i;
+    const length = heap.length;
+    const halfLength = length >>> 1;
+    while(index < halfLength){
+        const leftIndex = (index + 1) * 2 - 1;
+        const left = heap[leftIndex];
+        const rightIndex = leftIndex + 1;
+        const right = heap[rightIndex];
+        // If the left or right node is smaller, swap with the smaller of those.
+        if (compareQueuePriority(left, node) < 0) {
+            if (rightIndex < length && compareQueuePriority(right, left) < 0) {
+                heap[index] = right;
+                right._heapIndex = index;
+                heap[rightIndex] = node;
+                node._heapIndex = rightIndex;
+                index = rightIndex;
+            } else {
+                heap[index] = left;
+                left._heapIndex = index;
+                heap[leftIndex] = node;
+                node._heapIndex = leftIndex;
+                index = leftIndex;
+            }
+        } else if (rightIndex < length && compareQueuePriority(right, node) < 0) {
+            heap[index] = right;
+            right._heapIndex = index;
+            heap[rightIndex] = node;
+            node._heapIndex = rightIndex;
+            index = rightIndex;
+        } else {
+            // Neither child is smaller. Exit.
+            return;
+        }
+    }
+}
+
+//# sourceMappingURL=scheduler.js.map

node_modules/next/dist/esm/client/components/segment-cache-impl/tuple-map.js

@@ -0,0 +1,148 @@
+// Utility type. Prefix<[A, B, C, D]> matches [A], [A, B], [A, B, C] etc.
+/**
+ * Creates a map whose keys are tuples. Tuples are compared per-element. This
+ * is useful when a key has multiple parts, but you don't want to concatenate
+ * them into a single string value.
+ *
+ * In the Segment Cache, we use this to store cache entries by both their href
+ * and their Next-URL.
+ *
+ * Example:
+ *   map.set(['https://localhost', 'foo/bar/baz'], 'yay');
+ *   map.get(['https://localhost', 'foo/bar/baz']); // returns 'yay'
+ */ export function createTupleMap() {
+    let rootEntry = {
+        parent: null,
+        key: null,
+        hasValue: false,
+        value: null,
+        map: null
+    };
+    // To optimize successive lookups, we cache the last accessed keypath.
+    // Although it's not encoded in the type, these are both null or
+    // both non-null. It uses object equality, so to take advantage of this
+    // optimization, you must pass the same array instance to each successive
+    // method call, and you must also not mutate the array between calls.
+    let lastAccessedEntry = null;
+    let lastAccessedKeys = null;
+    function getOrCreateEntry(keys) {
+        if (lastAccessedKeys === keys) {
+            return lastAccessedEntry;
+        }
+        // Go through each level of keys until we find the entry that matches,
+        // or create a new one if it doesn't already exist.
+        let entry = rootEntry;
+        for(let i = 0; i < keys.length; i++){
+            const key = keys[i];
+            let map = entry.map;
+            if (map !== null) {
+                const existingEntry = map.get(key);
+                if (existingEntry !== undefined) {
+                    // Found a match. Keep going.
+                    entry = existingEntry;
+                    continue;
+                }
+            } else {
+                map = new Map();
+                entry.map = map;
+            }
+            // No entry exists yet at this level. Create a new one.
+            const newEntry = {
+                parent: entry,
+                key,
+                value: null,
+                hasValue: false,
+                map: null
+            };
+            map.set(key, newEntry);
+            entry = newEntry;
+        }
+        lastAccessedKeys = keys;
+        lastAccessedEntry = entry;
+        return entry;
+    }
+    function getEntryIfExists(keys) {
+        if (lastAccessedKeys === keys) {
+            return lastAccessedEntry;
+        }
+        // Go through each level of keys until we find the entry that matches, or
+        // return null if no match exists.
+        let entry = rootEntry;
+        for(let i = 0; i < keys.length; i++){
+            const key = keys[i];
+            let map = entry.map;
+            if (map !== null) {
+                const existingEntry = map.get(key);
+                if (existingEntry !== undefined) {
+                    // Found a match. Keep going.
+                    entry = existingEntry;
+                    continue;
+                }
+            }
+            // No entry exists at this level.
+            return null;
+        }
+        lastAccessedKeys = keys;
+        lastAccessedEntry = entry;
+        return entry;
+    }
+    function set(keys, value) {
+        const entry = getOrCreateEntry(keys);
+        entry.hasValue = true;
+        entry.value = value;
+    }
+    function get(keys) {
+        const entry = getEntryIfExists(keys);
+        if (entry === null || !entry.hasValue) {
+            return null;
+        }
+        return entry.value;
+    }
+    function deleteEntry(keys) {
+        const entry = getEntryIfExists(keys);
+        if (entry === null || !entry.hasValue) {
+            return;
+        }
+        // Found a match. Delete it from the cache.
+        const deletedEntry = entry;
+        deletedEntry.hasValue = false;
+        deletedEntry.value = null;
+        // Check if we can garbage collect the entry.
+        if (deletedEntry.map === null) {
+            // Since this entry has no value, and also no child entries, we can
+            // garbage collect it. Remove it from its parent, and keep garbage
+            // collecting the parents until we reach a non-empty entry.
+            // Unlike a `set` operation, these are no longer valid because the entry
+            // itself is being modified, not just the value it contains.
+            lastAccessedEntry = null;
+            lastAccessedKeys = null;
+            let parent = deletedEntry.parent;
+            let key = deletedEntry.key;
+            while(parent !== null){
+                const parentMap = parent.map;
+                if (parentMap !== null) {
+                    parentMap.delete(key);
+                    if (parentMap.size === 0) {
+                        // We just removed the last entry in the parent map.
+                        parent.map = null;
+                        if (parent.value === null) {
+                            // The parent node has no child entries, nor does it have a value
+                            // on itself. It can be garbage collected. Keep going.
+                            key = parent.key;
+                            parent = parent.parent;
+                            continue;
+                        }
+                    }
+                }
+                break;
+            }
+        }
+    }
+    return {
+        set,
+        get,
+        delete: deleteEntry
+    };
+}
+
+//# sourceMappingURL=tuple-map.js.map