class Selenium::WebDriver::Interactions::TypingInteraction

def assert_source(source) 

def assert_source(source)
  raise TypeError, "#{source.type} is not a valid input type" unless source.is_a? KeyInput
end

def assert_type(type) 

def assert_type(type)
  raise TypeError, "#{type.inspect} is not a valid key subtype" unless KeyInput::SUBTYPES.key? type
  KeyInput::SUBTYPES[type]
end

def encode 

def encode
  {type: @type, value: @key}
end

def initialize(source, type, key) 

def initialize(source, type, key)
  super(source)
  @type = assert_type(type)
  @key = Keys.encode_key(key)
end