class LanguageServer::Protocol::Interface::RegularExpressionsClientCapabilities

def engine
  attributes.fetch(:engine)
end

def initialize(engine:, version: nil)
  @attributes = {}
  @attributes[:engine] = engine
  @attributes[:version] = version if version
  @attributes.freeze
end

def to_hash
  attributes
end

def to_json(*args)
  to_hash.to_json(*args)
end

def version
  attributes.fetch(:version)
end