code: def validator_extra():
      return FlaglistValidator(
          "prop", "parent", flags=FLAGS, extras=EXTRAS
      )
  
imports: import itertools
  import pytest
  from _plotly_utils.basevalidators import FlaglistValidator
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: validator_extra() and returns: FlaglistValidator