next/dist/esm/client/components/router-reducer/create-initial-router-state.js

The React Framework

import { createHrefFromUrl } from './create-href-from-url';
import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head';
import { extractPathFromFlightRouterState } from './compute-changed-path';
import { addRefreshMarkerToActiveParallelSegments } from './refetch-inactive-parallel-segments';
import { getFlightDataPartsFromPath } from '../../flight-data-helpers';
export function createInitialRouterState({ navigatedAt, initialFlightData, initialCanonicalUrlParts, initialRenderedSearch, initialParallelRoutes, location }) {
    // When initialized on the server, the canonical URL is provided as an array of parts.
    // This is to ensure that when the RSC payload streamed to the client, crawlers don't interpret it
    // as a URL that should be crawled.
    const initialCanonicalUrl = initialCanonicalUrlParts.join('/');
    const normalizedFlightData = getFlightDataPartsFromPath(initialFlightData[0]);
    const { tree: initialTree, seedData: initialSeedData, head: initialHead } = normalizedFlightData;
    // For the SSR render, seed data should always be available (we only send back a `null` response
    // in the case of a `loading` segment, pre-PPR.)
    const rsc = initialSeedData?.[0];
    const loading = initialSeedData?.[2] ?? null;
    const cache = {
        lazyData: null,
        rsc,
        prefetchRsc: null,
        head: null,
        prefetchHead: null,
        // The cache gets seeded during the first render. `initialParallelRoutes` ensures the cache from the first render is there during the second render.
        parallelRoutes: initialParallelRoutes,
        loading,
        navigatedAt
    };
    const canonicalUrl = // location.href is read as the initial value for canonicalUrl in the browser
    // This is safe to do as canonicalUrl can't be rendered, it's only used to control the history updates in the useEffect further down in this file.
    location ? createHrefFromUrl(location) : initialCanonicalUrl;
    addRefreshMarkerToActiveParallelSegments(initialTree, canonicalUrl);
    // When the cache hasn't been seeded yet we fill the cache with the head.
    if (initialParallelRoutes === null || initialParallelRoutes.size === 0) {
        fillLazyItemsTillLeafWithHead(navigatedAt, cache, undefined, initialTree, initialSeedData, initialHead);
    }
    const initialState = {
        tree: initialTree,
        cache,
        pushRef: {
            pendingPush: false,
            mpaNavigation: false,
            // First render needs to preserve the previous window.history.state
            // to avoid it being overwritten on navigation back/forward with MPA Navigation.
            preserveCustomHistoryState: true
        },
        focusAndScrollRef: {
            apply: false,
            onlyHashChange: false,
            hashFragment: null,
            segmentPaths: []
        },
        canonicalUrl,
        renderedSearch: initialRenderedSearch,
        nextUrl: // the || operator is intentional, the pathname can be an empty string
        (extractPathFromFlightRouterState(initialTree) || location?.pathname) ?? null,
        previousNextUrl: null,
        debugInfo: null
    };
    return initialState;
}

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