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import type { LoaderTree } from '../lib/app-dir-module'
import { HasLoadingBoundary, type FlightRouterState } from './types'
import type { GetDynamicParamFromSegment } from './app-render'
import { addSearchParamsIfPageSegment } from '../../shared/lib/segment'
function createFlightRouterStateFromLoaderTreeImpl(
[segment, parallelRoutes, { layout, loading }]: LoaderTree,
getDynamicParamFromSegment: GetDynamicParamFromSegment,
searchParams: any,
includeHasLoadingBoundary: boolean,
didFindRootLayout: boolean
): FlightRouterState {
const dynamicParam = getDynamicParamFromSegment(segment)
const treeSegment = dynamicParam ? dynamicParam.treeSegment : segment
const segmentTree: FlightRouterState = [
addSearchParamsIfPageSegment(treeSegment, searchParams),
{},
]
// Mark the first segment that has a layout as the "root" layout
if (!didFindRootLayout && typeof layout !== 'undefined') {
didFindRootLayout = true
segmentTree[4] = true
}
let childHasLoadingBoundary = false
const children: FlightRouterState[1] = {}
Object.keys(parallelRoutes).forEach((parallelRouteKey) => {
const child = createFlightRouterStateFromLoaderTreeImpl(
parallelRoutes[parallelRouteKey],
getDynamicParamFromSegment,
searchParams,
includeHasLoadingBoundary,
didFindRootLayout
)
if (
includeHasLoadingBoundary &&
child[5] !== HasLoadingBoundary.SubtreeHasNoLoadingBoundary
) {
childHasLoadingBoundary = true
}
children[parallelRouteKey] = child
})
segmentTree[1] = children
if (includeHasLoadingBoundary) {
// During a route tree prefetch, the FlightRouterState includes whether a
// tree has a loading boundary. The client uses this to determine if it can
// skip the data prefetch request — if `hasLoadingBoundary` is `false`, the
// data prefetch response will be empty, so there's no reason to request it.
// NOTE: It would be better to accumulate this while building the loader
// tree so we don't have to keep re-deriving it, but since this won't be
// once PPR is enabled everywhere, it's not that important.
segmentTree[5] = loading
? HasLoadingBoundary.SegmentHasLoadingBoundary
: childHasLoadingBoundary
? HasLoadingBoundary.SubtreeHasLoadingBoundary
: HasLoadingBoundary.SubtreeHasNoLoadingBoundary
}
return segmentTree
}
export function createFlightRouterStateFromLoaderTree(
loaderTree: LoaderTree,
getDynamicParamFromSegment: GetDynamicParamFromSegment,
searchParams: any
) {
const includeHasLoadingBoundary = false
const didFindRootLayout = false
return createFlightRouterStateFromLoaderTreeImpl(
loaderTree,
getDynamicParamFromSegment,
searchParams,
includeHasLoadingBoundary,
didFindRootLayout
)
}
export function createRouteTreePrefetch(
loaderTree: LoaderTree,
getDynamicParamFromSegment: GetDynamicParamFromSegment
): FlightRouterState {
// Search params should not be added to page segment's cache key during a
// route tree prefetch request, because they do not affect the structure of
// the route. The client cache has its own logic to handle search params.
const searchParams = {}
// During a route tree prefetch, we include `hasLoadingBoundary` in
// the response.
const includeHasLoadingBoundary = true
const didFindRootLayout = false
return createFlightRouterStateFromLoaderTreeImpl(
loaderTree,
getDynamicParamFromSegment,
searchParams,
includeHasLoadingBoundary,
didFindRootLayout
)
}
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