next/dist/esm/client/components/router-reducer/reducers/prefetch-reducer.js

The React Framework

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(state) {
    // 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, action) {
    // 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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