code: def unknown_directive_message(directive_name):
      return 'Unknown directive "{}".'.format(directive_name)
  
file_path: wandb/wandb/vendor/graphql-core-1.1/wandb_graphql/validation/rules/known_directives.py
imports: from ...error import GraphQLError
  from ...language import ast
  from ...type.directives import DirectiveLocation
  from .base import ValidationRule
label_desc: Use image node_id 2 for calling the KnownDirectives obj's underlying member method code with example usage: obj.unknown_directive_message(directive_name) and returns: str