next/dist/esm/client/components/router-reducer/handle-mutable.js

The React Framework

import { computeChangedPath } from './compute-changed-path';
function isNotUndefined(value) {
    return typeof value !== 'undefined';
}
export function handleMutable(state, mutable) {
    // shouldScroll is true by default, can override to false.
    const shouldScroll = mutable.shouldScroll ?? true;
    let previousNextUrl = state.previousNextUrl;
    let nextUrl = state.nextUrl;
    if (isNotUndefined(mutable.patchedTree)) {
        // If we received a patched tree, we need to compute the changed path.
        const changedPath = computeChangedPath(state.tree, mutable.patchedTree);
        if (changedPath) {
            // If the tree changed, we need to update the nextUrl
            previousNextUrl = nextUrl;
            nextUrl = changedPath;
        } else if (!nextUrl) {
            // if the tree ends up being the same (ie, no changed path), and we don't have a nextUrl, then we should use the canonicalUrl
            nextUrl = state.canonicalUrl;
        }
    // otherwise this will be a no-op and continue to use the existing nextUrl
    }
    return {
        // Set href.
        canonicalUrl: mutable.canonicalUrl ?? state.canonicalUrl,
        renderedSearch: mutable.renderedSearch ?? state.renderedSearch,
        pushRef: {
            pendingPush: isNotUndefined(mutable.pendingPush) ? mutable.pendingPush : state.pushRef.pendingPush,
            mpaNavigation: isNotUndefined(mutable.mpaNavigation) ? mutable.mpaNavigation : state.pushRef.mpaNavigation,
            preserveCustomHistoryState: isNotUndefined(mutable.preserveCustomHistoryState) ? mutable.preserveCustomHistoryState : state.pushRef.preserveCustomHistoryState
        },
        // All navigation requires scroll and focus management to trigger.
        focusAndScrollRef: {
            apply: shouldScroll ? isNotUndefined(mutable?.scrollableSegments) ? true : state.focusAndScrollRef.apply : false,
            onlyHashChange: mutable.onlyHashChange || false,
            hashFragment: shouldScroll ? // #top is handled in layout-router.
            mutable.hashFragment && mutable.hashFragment !== '' ? decodeURIComponent(mutable.hashFragment.slice(1)) : state.focusAndScrollRef.hashFragment : null,
            segmentPaths: shouldScroll ? mutable?.scrollableSegments ?? state.focusAndScrollRef.segmentPaths : []
        },
        // Apply cache.
        cache: mutable.cache ? mutable.cache : state.cache,
        // Apply patched router state.
        tree: isNotUndefined(mutable.patchedTree) ? mutable.patchedTree : state.tree,
        nextUrl,
        previousNextUrl: previousNextUrl,
        debugInfo: mutable.collectedDebugInfo ?? null
    };
}

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