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import type {
PrefetchAction,
ReducerState,
ReadonlyReducerState,
} from '../router-reducer-types'
import { PromiseQueue } from '../../promise-queue'
import {
getOrCreatePrefetchCacheEntry,
prunePrefetchCache,
} from '../prefetch-cache-utils'
export const prefetchQueue = new PromiseQueue(5)
export const prefetchReducer = process.env.__NEXT_CLIENT_SEGMENT_CACHE
? identityReducerWhenSegmentCacheIsEnabled
: prefetchReducerImpl
function identityReducerWhenSegmentCacheIsEnabled<T>(state: T): T {
// Unlike the old implementation, the Segment Cache doesn't store its data in
// the router reducer state.
//
// This shouldn't be reachable because we wrap the prefetch API in a check,
// too, which prevents the action from being dispatched. But it's here for
// clarity + code elimination.
return state
}
function prefetchReducerImpl(
state: ReadonlyReducerState,
action: PrefetchAction
): ReducerState {
// let's prune the prefetch cache before we do anything else
prunePrefetchCache(state.prefetchCache)
const { url } = action
getOrCreatePrefetchCacheEntry({
url,
nextUrl: state.nextUrl,
prefetchCache: state.prefetchCache,
kind: action.kind,
tree: state.tree,
allowAliasing: true,
})
return state
}
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