next
Version:
The React Framework
50 lines (49 loc) • 2.69 kB
JavaScript
import { createHrefFromUrl } from '../create-href-from-url';
import { applyRouterStatePatchToTree } from '../apply-router-state-patch-to-tree';
import { isNavigatingToNewRootLayout } from '../is-navigating-to-new-root-layout';
import { handleExternalUrl } from './navigate-reducer';
import { applyFlightData } from '../apply-flight-data';
import { handleMutable } from '../handle-mutable';
import { createEmptyCacheNode } from '../../app-router';
export function serverPatchReducer(state, action) {
const { serverResponse: { flightData, canonicalUrl: canonicalUrlOverride }, navigatedAt } = action;
const mutable = {};
mutable.preserveCustomHistoryState = false;
// Handle case when navigating to page in `pages` from `app`
if (typeof flightData === 'string') {
return handleExternalUrl(state, mutable, flightData, state.pushRef.pendingPush);
}
let currentTree = state.tree;
let currentCache = state.cache;
for (const normalizedFlightData of flightData){
const { segmentPath: flightSegmentPath, tree: treePatch } = normalizedFlightData;
const newTree = applyRouterStatePatchToTree(// TODO-APP: remove ''
[
'',
...flightSegmentPath
], currentTree, treePatch, state.canonicalUrl);
// `applyRouterStatePatchToTree` returns `null` when it determined that the server response is not applicable to the current tree.
// In other words, the server responded with a tree that doesn't match what the client is currently rendering.
// This can happen if the server patch action took longer to resolve than a subsequent navigation which would have changed the tree.
// Previously this case triggered an MPA navigation but it should be safe to simply discard the server response rather than forcing
// the entire page to reload.
if (newTree === null) {
return state;
}
if (isNavigatingToNewRootLayout(currentTree, newTree)) {
return handleExternalUrl(state, mutable, state.canonicalUrl, state.pushRef.pendingPush);
}
const canonicalUrlOverrideHref = canonicalUrlOverride ? createHrefFromUrl(canonicalUrlOverride) : undefined;
if (canonicalUrlOverrideHref) {
mutable.canonicalUrl = canonicalUrlOverrideHref;
}
const cache = createEmptyCacheNode();
applyFlightData(navigatedAt, currentCache, cache, normalizedFlightData);
mutable.patchedTree = newTree;
mutable.cache = cache;
currentCache = cache;
currentTree = newTree;
}
return handleMutable(state, mutable);
}
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