import { createPrefetchURL } from '../app-router';
import { createCacheKey } from './cache-key';
import { schedulePrefetchTask } from './scheduler';
import { PrefetchPriority } from '../segment-cache';
/**
* Entrypoint for prefetching a URL into the Segment Cache.
* @param href - The URL to prefetch. Typically this will come from a ,
* or router.prefetch. It must be validated before we attempt to prefetch it.
* @param nextUrl - A special header used by the server for interception routes.
* Roughly corresponds to the current URL.
* @param treeAtTimeOfPrefetch - The FlightRouterState at the time the prefetch
* was requested. This is only used when PPR is disabled.
* @param fetchStrategy - Whether to prefetch dynamic data, in addition to
* static data. This is used by ``.
* @param onInvalidate - A callback that will be called when the prefetch cache
* When called, it signals to the listener that the data associated with the
* prefetch may have been invalidated from the cache. This is not a live
* subscription — it's called at most once per `prefetch` call. The only
* supported use case is to trigger a new prefetch inside the listener, if
* desired. It also may be called even in cases where the associated data is
* still cached. Prefetching is a poll-based (pull) operation, not an event-
* based (push) one. Rather than subscribe to specific cache entries, you
* occasionally poll the prefetch cache to check if anything is missing.
*/ export function prefetch(href, nextUrl, treeAtTimeOfPrefetch, fetchStrategy, onInvalidate) {
const url = createPrefetchURL(href);
if (url === null) {
// This href should not be prefetched.
return;
}
const cacheKey = createCacheKey(url.href, nextUrl);
schedulePrefetchTask(cacheKey, treeAtTimeOfPrefetch, fetchStrategy, PrefetchPriority.Default, onInvalidate);
}
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