next/dist/esm/client/components/router-reducer/apply-flight-data.js

The React Framework

import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head';
import { fillCacheWithNewSubTreeData } from './fill-cache-with-new-subtree-data';
export function applyFlightData(existingCache, cache, flightData, prefetchEntry) {
    // The one before last item is the router state tree patch
    const { tree: treePatch, seedData, head, isRootRender } = flightData;
    // Handles case where prefetch only returns the router tree patch without rendered components.
    if (seedData === null) {
        return false;
    }
    if (isRootRender) {
        const rsc = seedData[1];
        const loading = seedData[3];
        cache.loading = loading;
        cache.rsc = rsc;
        // This is a PPR-only field. When PPR is enabled, we shouldn't hit
        // this path during a navigation, but until PPR is fully implemented
        // yet it's possible the existing node does have a non-null
        // `prefetchRsc`. As an incremental step, we'll just de-opt to the
        // old behavior — no PPR value.
        cache.prefetchRsc = null;
        fillLazyItemsTillLeafWithHead(cache, existingCache, treePatch, seedData, head, prefetchEntry);
    } else {
        // Copy rsc for the root node of the cache.
        cache.rsc = existingCache.rsc;
        // This is a PPR-only field. Unlike the previous branch, since we're
        // just cloning the existing cache node, we might as well keep the
        // PPR value, if it exists.
        cache.prefetchRsc = existingCache.prefetchRsc;
        cache.parallelRoutes = new Map(existingCache.parallelRoutes);
        cache.loading = existingCache.loading;
        // Create a copy of the existing cache with the rsc applied.
        fillCacheWithNewSubTreeData(cache, existingCache, flightData, prefetchEntry);
    }
    return true;
}

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