First concept

node_modules/next/dist/client/components/router-reducer/prefetch-cache-utils.d.ts

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+import { type FetchServerResponseResult } from './fetch-server-response';
+import { PrefetchCacheEntryStatus, type PrefetchCacheEntry, PrefetchKind, type ReadonlyReducerState } from './router-reducer-types';
+/**
+ * Returns a prefetch cache entry if one exists. Otherwise creates a new one and enqueues a fetch request
+ * to retrieve the prefetch data from the server.
+ */
+export declare function getOrCreatePrefetchCacheEntry({ url, nextUrl, tree, buildId, prefetchCache, kind, }: Pick<ReadonlyReducerState, 'nextUrl' | 'prefetchCache' | 'tree' | 'buildId'> & {
+    url: URL;
+    kind?: PrefetchKind;
+}): PrefetchCacheEntry;
+/**
+ * Use to seed the prefetch cache with data that has already been fetched.
+ */
+export declare function createPrefetchCacheEntryForInitialLoad({ nextUrl, tree, prefetchCache, url, kind, data, }: Pick<ReadonlyReducerState, 'nextUrl' | 'tree' | 'prefetchCache'> & {
+    url: URL;
+    kind: PrefetchKind;
+    data: FetchServerResponseResult;
+}): {
+    treeAtTimeOfPrefetch: import("../../../server/app-render/types").FlightRouterState;
+    data: Promise<FetchServerResponseResult>;
+    kind: PrefetchKind;
+    prefetchTime: number;
+    lastUsedTime: number;
+    key: string;
+    status: PrefetchCacheEntryStatus;
+};
+export declare function prunePrefetchCache(prefetchCache: ReadonlyReducerState['prefetchCache']): void;