ObjectStore createObjectStore(
String name,
{String keyPath,
bool autoIncrement}
)

Not documented.

Source

@DomName('IDBDatabase.createObjectStore')
@DocsEditable()
ObjectStore createObjectStore(String name,
    {String keyPath, bool autoIncrement}) {
  var options = {};
  if (keyPath != null) {
    options['keyPath'] = keyPath;
  }
  if (autoIncrement != null) {
    options['autoIncrement'] = autoIncrement;
  }

  return _createObjectStore(name, options);
}