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[Fizz] Fix root segment IDs #27371

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merged 1 commit into from
Sep 14, 2023
Merged

[Fizz] Fix root segment IDs #27371

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21 changes: 16 additions & 5 deletions packages/react-server/src/ReactFizzServer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,7 @@ type ReplaySuspenseBoundary = [
string | number /* key */,
Array<ResumableNode> /* children */,
SuspenseBoundaryID /* id */,
number /* rootSegmentID */,
];

type ReplayNode =
Expand Down Expand Up @@ -1957,6 +1958,7 @@ function trackPostpone(
request.renderState,
request.resumableState,
);
boundary.rootSegmentID = request.nextSegmentId++;

const boundaryKeyPath = boundary.keyPath;
if (boundaryKeyPath === null) {
Expand All @@ -1971,6 +1973,7 @@ function trackPostpone(
boundaryKeyPath[2],
children,
boundary.id,
boundary.rootSegmentID,
];
trackedPostpones.workingMap.set(boundaryKeyPath, boundaryNode);
addToReplayParent(boundaryNode, boundaryKeyPath[0], trackedPostpones);
Expand Down Expand Up @@ -2021,7 +2024,7 @@ function injectPostponedHole(
segment.children.push(newSegment);
// Reset lastPushedText for current Segment since the new Segment "consumed" it
segment.lastPushedText = false;
return segment;
return newSegment;
}

function spawnNewSuspendedTask(
Expand Down Expand Up @@ -2316,7 +2319,9 @@ function queueCompletedSegment(
if (
segment.chunks.length === 0 &&
segment.children.length === 1 &&
segment.children[0].boundary === null
segment.children[0].boundary === null &&
// Typically the id would not be assigned yet but if it's a postponed segment it might be.
segment.children[0].id === -1
) {
// This is an empty segment. There's nothing to write, so we can instead transfer the ID
// to the child. That way any existing references point to the child.
Expand Down Expand Up @@ -2668,20 +2673,22 @@ function flushSegment(
);
} else if (boundary.status !== COMPLETED) {
if (boundary.status === PENDING) {
// For pending boundaries we lazily assign an ID to the boundary
// and root segment.
boundary.id = assignSuspenseBoundaryID(
request.renderState,
request.resumableState,
);
boundary.rootSegmentID = request.nextSegmentId++;
}
// This boundary is still loading. Emit a pending suspense boundary wrapper.

// Assign an ID to refer to the future content by.
boundary.rootSegmentID = request.nextSegmentId++;
if (boundary.completedSegments.length > 0) {
// If this is at least partially complete, we can queue it to be partially emitted early.
request.partialBoundaries.push(boundary);
}

// This boundary is still loading. Emit a pending suspense boundary wrapper.

/// This is the first time we should have referenced this ID.
const id = boundary.id;

Expand Down Expand Up @@ -2868,6 +2875,10 @@ function flushPartiallyCompletedSegment(
);
}

return flushSegmentContainer(request, destination, segment);
} else if (segmentID === boundary.rootSegmentID) {
// When we emit postponed boundaries, we might have assigned the ID already
// but it's still the root segment so we can't inject it into the parent yet.
return flushSegmentContainer(request, destination, segment);
} else {
flushSegmentContainer(request, destination, segment);
Expand Down