Function markAsUntransferable

lib/internal/buffer.js:1078–1086

(obj)

// This would better be placed in internal/worker/io.js, but that doesn't work
// because Buffer needs this and that would introduce a cyclic dependency.
function markAsUntransferable(obj) {
  if ((typeof obj !== 'object' && typeof obj !== 'function') || obj === null)
    return;  // This object is a primitive and therefore already untransferable.
  obj[untransferable_object_private_symbol] = true;

  if (isArrayBuffer(obj)) {
    setDetachKey(obj, kDetachKey);
  }
}

// This simply checks if the object is marked as untransferable and doesn't
// check whether we are able to transfer it.