修改：同步流媒体优化

liusuyi

2024-07-30 9cc1e95b63fde336ebf4df413b3d1e79ece375f0

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export default function _classExtractFieldDescriptor(receiver, privateMap, action) {
  if (!privateMap.has(receiver)) {
    throw new TypeError("attempted to " + action + " private field on non-instance");
  }
  return privateMap.get(receiver);
}