next/dist/esm/client/components/router-reducer/fill-lazy-items-till-leaf-with-head.js

The React Framework

import { createRouterCacheKey } from './create-router-cache-key';
import { PrefetchCacheEntryStatus } from './router-reducer-types';
export function fillLazyItemsTillLeafWithHead(newCache, existingCache, routerState, cacheNodeSeedData, head, prefetchEntry) {
    const isLastSegment = Object.keys(routerState[1]).length === 0;
    if (isLastSegment) {
        newCache.head = head;
        return;
    }
    // Remove segment that we got data for so that it is filled in during rendering of rsc.
    for(const key in routerState[1]){
        const parallelRouteState = routerState[1][key];
        const segmentForParallelRoute = parallelRouteState[0];
        const cacheKey = createRouterCacheKey(segmentForParallelRoute);
        // TODO: We should traverse the cacheNodeSeedData tree instead of the router
        // state tree. Ideally, they would always be the same shape, but because of
        // the loading.js pattern, cacheNodeSeedData sometimes only represents a
        // partial tree. That's why this node is sometimes null. Once PPR lands,
        // loading.js will no longer have special behavior and we can traverse the
        // data tree instead.
        //
        // We should also consider merging the router state tree and the data tree
        // in the response format, so that we don't have to send the keys twice.
        // Then the client can convert them into separate representations.
        const parallelSeedData = cacheNodeSeedData !== null && cacheNodeSeedData[2][key] !== undefined ? cacheNodeSeedData[2][key] : null;
        if (existingCache) {
            const existingParallelRoutesCacheNode = existingCache.parallelRoutes.get(key);
            if (existingParallelRoutesCacheNode) {
                const hasReusablePrefetch = (prefetchEntry == null ? void 0 : prefetchEntry.kind) === 'auto' && prefetchEntry.status === PrefetchCacheEntryStatus.reusable;
                let parallelRouteCacheNode = new Map(existingParallelRoutesCacheNode);
                const existingCacheNode = parallelRouteCacheNode.get(cacheKey);
                let newCacheNode;
                if (parallelSeedData !== null) {
                    // New data was sent from the server.
                    const seedNode = parallelSeedData[1];
                    const loading = parallelSeedData[3];
                    newCacheNode = {
                        lazyData: null,
                        rsc: seedNode,
                        // 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.
                        prefetchRsc: null,
                        head: null,
                        prefetchHead: null,
                        loading,
                        parallelRoutes: new Map(existingCacheNode == null ? void 0 : existingCacheNode.parallelRoutes)
                    };
                } else if (hasReusablePrefetch && existingCacheNode) {
                    // No new data was sent from the server, but the existing cache node
                    // was prefetched, so we should reuse that.
                    newCacheNode = {
                        lazyData: existingCacheNode.lazyData,
                        rsc: existingCacheNode.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.
                        prefetchRsc: existingCacheNode.prefetchRsc,
                        head: existingCacheNode.head,
                        prefetchHead: existingCacheNode.prefetchHead,
                        parallelRoutes: new Map(existingCacheNode.parallelRoutes),
                        loading: existingCacheNode.loading
                    };
                } else {
                    // No data available for this node. This will trigger a lazy fetch
                    // during render.
                    newCacheNode = {
                        lazyData: null,
                        rsc: null,
                        prefetchRsc: null,
                        head: null,
                        prefetchHead: null,
                        parallelRoutes: new Map(existingCacheNode == null ? void 0 : existingCacheNode.parallelRoutes),
                        loading: null
                    };
                }
                // Overrides the cache key with the new cache node.
                parallelRouteCacheNode.set(cacheKey, newCacheNode);
                // Traverse deeper to apply the head / fill lazy items till the head.
                fillLazyItemsTillLeafWithHead(newCacheNode, existingCacheNode, parallelRouteState, parallelSeedData ? parallelSeedData : null, head, prefetchEntry);
                newCache.parallelRoutes.set(key, parallelRouteCacheNode);
                continue;
            }
        }
        let newCacheNode;
        if (parallelSeedData !== null) {
            // New data was sent from the server.
            const seedNode = parallelSeedData[1];
            const loading = parallelSeedData[3];
            newCacheNode = {
                lazyData: null,
                rsc: seedNode,
                prefetchRsc: null,
                head: null,
                prefetchHead: null,
                parallelRoutes: new Map(),
                loading
            };
        } else {
            // No data available for this node. This will trigger a lazy fetch
            // during render.
            newCacheNode = {
                lazyData: null,
                rsc: null,
                prefetchRsc: null,
                head: null,
                prefetchHead: null,
                parallelRoutes: new Map(),
                loading: null
            };
        }
        const existingParallelRoutes = newCache.parallelRoutes.get(key);
        if (existingParallelRoutes) {
            existingParallelRoutes.set(cacheKey, newCacheNode);
        } else {
            newCache.parallelRoutes.set(key, new Map([
                [
                    cacheKey,
                    newCacheNode
                ]
            ]));
        }
        fillLazyItemsTillLeafWithHead(newCacheNode, undefined, parallelRouteState, parallelSeedData, head, prefetchEntry);
    }
}

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