Function preparePreamble

packages/react-server/src/ReactFizzServer.js:5567–5587

(request: Request)

}

function preparePreamble(request: Request) {
  if (
    request.completedRootSegment &&
    request.completedPreambleSegments === null
  ) {
    const collectedPreambleSegments: Array<Array<Segment>> = [];
    const originalRequestByteSize = request.byteSize;
    const hasPendingPreambles = preparePreambleFromSegment(
      request,
      request.completedRootSegment,
      collectedPreambleSegments,
    );
    if (isPreambleReady(request.renderState, hasPendingPreambles)) {
      request.completedPreambleSegments = collectedPreambleSegments;
    } else {
      // We restore the original size since the preamble is not ready
      // and we will prepare it again.
      request.byteSize = originalRequestByteSize;
    }
  }
}

function flushPreamble(
  request: Request,