Function emitPostponeChunk

packages/react-server/src/ReactFlightServer.js:4041–4065

(
  request: Request,
  id: number,
  postponeInstance: Postpone,
)

}

function emitPostponeChunk(
  request: Request,
  id: number,
  postponeInstance: Postpone,
): void {
  let row;
  if (__DEV__) {
    let reason = '';
    let stack: ReactStackTrace;
    const env = request.environmentName();
    try {
      // eslint-disable-next-line react-internal/safe-string-coercion
      reason = String(postponeInstance.message);
      stack = filterStackTrace(request, parseStackTrace(postponeInstance, 0));
    } catch (x) {
      stack = [];
    }
    row = serializeRowHeader('P', id) + stringify({reason, stack, env}) + '\n';
  } else {
    // No reason included in prod.
    row = serializeRowHeader('P', id) + '\n';
  }
  const processedChunk = stringToChunk(row);
  request.completedErrorChunks.push(processedChunk);
}

function serializeErrorValue(request: Request, error: Error): string {
  if (__DEV__) {