code: def enter_ObjectField(self, node):
      object_type = get_named_type(self.get_input_type())
      field_type = None
      if isinstance(object_type, GraphQLInputObjectType):
          input_field = object_type.fields.get(node.name.value)
          field_type = input_field.type if input_field else None
      self._input_type_stack.append(field_type)
  
imports: from ..language import visitor_meta
  from ..type.definition import GraphQLInputObjectType, GraphQLList, get_named_type, get_nullable_type, is_composite_type
  from .get_field_def import get_field_def
  from .type_from_ast import type_from_ast
label_desc: Use image node_id 18 for calling the TypeInfo obj's underlying member method code with example usage: obj.enter_ObjectField(node) without return types