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import type { CacheNode } from '../../../shared/lib/app-router-context.shared-runtime'
import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head'
import { fillCacheWithNewSubTreeData } from './fill-cache-with-new-subtree-data'
import type { PrefetchCacheEntry } from './router-reducer-types'
import type { NormalizedFlightData } from '../../flight-data-helpers'
export function applyFlightData(
navigatedAt: number,
existingCache: CacheNode,
cache: CacheNode,
flightData: NormalizedFlightData,
prefetchEntry?: PrefetchCacheEntry
): boolean {
// 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(
navigatedAt,
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(
navigatedAt,
cache,
existingCache,
flightData,
prefetchEntry
)
}
return true
}
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