Function markTransferMode

lib/internal/worker/js_transferable.js:91–98

* Mark an object as being transferable or customized cloneable in * `.postMessage()`. * This should only applied to host objects like Web API interfaces, Node.js' * built-in objects. * Objects marked as cloneable and transferable should implement the method * `@@kClone` and `@@kTransfer` respec

(obj, cloneable = false, transferable = false)

 *   `@@kTransfer` is implemented.
 */
function markTransferMode(obj, cloneable = false, transferable = false) {
  if ((typeof obj !== 'object' && typeof obj !== 'function') || obj === null)
    return;  // This object is a primitive and therefore already untransferable.
  let mode = kDisallowCloneAndTransfer;
  if (cloneable) mode |= kCloneable;
  if (transferable) mode |= kTransferable;
  obj[transfer_mode_private_symbol] = mode;
}


webidl.converters.StructuredSerializeOptions = webidl