next/dist/esm/client/components/router-reducer/reducers/find-head-in-cache.js

The React Framework

import { createRouterCacheKey } from '../create-router-cache-key';
export function findHeadInCache(cache, parallelRoutes) {
    return findHeadInCacheImpl(cache, parallelRoutes, '');
}
function findHeadInCacheImpl(cache, parallelRoutes, keyPrefix) {
    const isLastItem = Object.keys(parallelRoutes).length === 0;
    if (isLastItem) {
        // Returns the entire Cache Node of the segment whose head we will render.
        return [
            cache,
            keyPrefix
        ];
    }
    // First try the 'children' parallel route if it exists
    // when starting from the "root", this corresponds with the main page component
    const parallelRoutesKeys = Object.keys(parallelRoutes).filter((key)=>key !== 'children');
    // if we are at the root, we need to check the children slot first
    if ('children' in parallelRoutes) {
        parallelRoutesKeys.unshift('children');
    }
    for (const key of parallelRoutesKeys){
        const [segment, childParallelRoutes] = parallelRoutes[key];
        const childSegmentMap = cache.parallelRoutes.get(key);
        if (!childSegmentMap) {
            continue;
        }
        const cacheKey = createRouterCacheKey(segment);
        const cacheNode = childSegmentMap.get(cacheKey);
        if (!cacheNode) {
            continue;
        }
        const item = findHeadInCacheImpl(cacheNode, childParallelRoutes, keyPrefix + '/' + cacheKey);
        if (item) {
            return item;
        }
    }
    return null;
}

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