Function serializeClientReference

packages/react-server/src/ReactFlightServer.js:2754–2800

(
  request: Request,
  parent:
    | {+[propertyName: string | number]: ReactClientValue}
    | $ReadOnlyArray<ReactClientValue>,
  parentPropertyName: string,
  clientReference: ClientReference<any>,
)

}

function serializeClientReference(
  request: Request,
  parent:
    | {+[propertyName: string | number]: ReactClientValue}
    | $ReadOnlyArray<ReactClientValue>,
  parentPropertyName: string,
  clientReference: ClientReference<any>,
): string {
  const clientReferenceKey: ClientReferenceKey =
    getClientReferenceKey(clientReference);
  const writtenClientReferences = request.writtenClientReferences;
  const existingId = writtenClientReferences.get(clientReferenceKey);
  if (existingId !== undefined) {
    if (parent[0] === REACT_ELEMENT_TYPE && parentPropertyName === '1') {
      // If we're encoding the "type" of an element, we can refer
      // to that by a lazy reference instead of directly since React
      // knows how to deal with lazy values. This lets us suspend
      // on this component rather than its parent until the code has
      // loaded.
      return serializeLazyID(existingId);
    }
    return serializeByValueID(existingId);
  }
  try {
    const clientReferenceMetadata: ClientReferenceMetadata =
      resolveClientReferenceMetadata(request.bundlerConfig, clientReference);
    request.pendingChunks++;
    const importId = request.nextChunkId++;
    emitImportChunk(request, importId, clientReferenceMetadata, false);
    writtenClientReferences.set(clientReferenceKey, importId);
    if (parent[0] === REACT_ELEMENT_TYPE && parentPropertyName === '1') {
      // If we're encoding the "type" of an element, we can refer
      // to that by a lazy reference instead of directly since React
      // knows how to deal with lazy values. This lets us suspend
      // on this component rather than its parent until the code has
      // loaded.
      return serializeLazyID(importId);
    }
    return serializeByValueID(importId);
  } catch (x) {
    request.pendingChunks++;
    const errorId = request.nextChunkId++;
    const digest = logRecoverableError(request, x, null);
    emitErrorChunk(request, errorId, digest, x, false, null);
    return serializeByValueID(errorId);
  }
}

function serializeDebugClientReference(
  request: Request,