class GraphQL::StaticValidation::VariableNamesAreUniqueError

def code 

def code
  "variableNotUnique"
end

def initialize(message, path: nil, nodes: [], name:) 

def initialize(message, path: nil, nodes: [], name:)
  super(message, path: path, nodes: nodes)
  @variable_name = name
end

def to_h

A hash representation of this Message 
def to_h
  extensions = {
    "code" => code,
    "variableName" => variable_name
  }
  super.merge({
    "extensions" => extensions
  })
end