First concept

node_modules/next/dist/client/components/router-reducer/create-initial-router-state.d.ts

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+import type { ReactNode } from 'react';
+import type { CacheNode } from '../../../shared/lib/app-router-context.shared-runtime';
+import type { FlightRouterState, CacheNodeSeedData } from '../../../server/app-render/types';
+import { type PrefetchCacheEntry } from './router-reducer-types';
+export interface InitialRouterStateParameters {
+    buildId: string;
+    initialTree: FlightRouterState;
+    initialCanonicalUrl: string;
+    initialSeedData: CacheNodeSeedData;
+    initialParallelRoutes: CacheNode['parallelRoutes'];
+    location: Location | null;
+    initialHead: ReactNode;
+    couldBeIntercepted?: boolean;
+}
+export declare function createInitialRouterState({ buildId, initialTree, initialSeedData, initialCanonicalUrl, initialParallelRoutes, location, initialHead, couldBeIntercepted, }: InitialRouterStateParameters): {
+    buildId: string;
+    tree: FlightRouterState;
+    cache: import("../../../shared/lib/app-router-context.shared-runtime").ReadyCacheNode;
+    prefetchCache: Map<string, PrefetchCacheEntry>;
+    pushRef: {
+        pendingPush: boolean;
+        mpaNavigation: boolean;
+        preserveCustomHistoryState: boolean;
+    };
+    focusAndScrollRef: {
+        apply: boolean;
+        onlyHashChange: boolean;
+        hashFragment: null;
+        segmentPaths: never[];
+    };
+    canonicalUrl: string;
+    nextUrl: string | null;
+};