Function preparePreambleFromSubtree

packages/react-server/src/ReactFizzServer.js:5472–5491

(
  request: Request,
  segment: Segment,
  collectedPreambleSegments: Array<Array<Segment>>,
)

}

function preparePreambleFromSubtree(
  request: Request,
  segment: Segment,
  collectedPreambleSegments: Array<Array<Segment>>,
): boolean {
  if (segment.preambleChildren.length) {
    collectedPreambleSegments.push(segment.preambleChildren);
  }
  let pendingPreambles = false;
  for (let i = 0; i < segment.children.length; i++) {
    const nextSegment = segment.children[i];
    pendingPreambles =
      preparePreambleFromSegment(
        request,
        nextSegment,
        collectedPreambleSegments,
      ) || pendingPreambles;
  }
  return pendingPreambles;
}

function preparePreambleFromSegment(
  request: Request,