class Prism::UndefNode

^^^^^^^^^^^^^^^^^^^^^^
undef :foo, :bar, :baz
Represents the use of the ‘undef` keyword.

def self.type

def self.type: () -> Symbol

class, but should be faster in a case statement or an array comparison.
Note that like #type, it will still be slower than using == for a single
splitting on the type of the node without having to do a long === chain.
Similar to #type, this method returns a symbol that you can use for 
def self.type
  :undef_node
end

def accept(visitor)

def accept: (Visitor visitor) -> void 
def accept(visitor)
  visitor.visit_undef_node(self)
end

def child_nodes

def child_nodes: () -> Array[nil | Node] 
def child_nodes
  [*names]
end

def comment_targets

def comment_targets: () -> Array[Node | Location] 
def comment_targets
  [*names, keyword_loc]
end

def compact_child_nodes

def compact_child_nodes: () -> Array[Node] 
def compact_child_nodes
  [*names]
end

def copy(**params)

def copy: (**params) -> UndefNode 
def copy(**params)
  UndefNode.new(
    params.fetch(:names) { names },
    params.fetch(:keyword_loc) { keyword_loc },
    params.fetch(:location) { location },
  )
end

def deconstruct_keys(keys)

def deconstruct_keys: (Array[Symbol] keys) -> { names: Array[Node], keyword_loc: Location, location: Location } 
def deconstruct_keys(keys)
  { names: names, keyword_loc: keyword_loc, location: location }
end

def initialize(names, keyword_loc, location)

def initialize: (Array[Node] names, Location keyword_loc, Location location) -> void 
def initialize(names, keyword_loc, location)
  @newline = false
  @names = names
  @keyword_loc = keyword_loc
  @location = location
end

def inspect(inspector = NodeInspector.new)

def inspect(NodeInspector inspector) -> String 
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── names: #{inspector.list("#{inspector.prefix}│   ", names)}"
  inspector << "└── keyword_loc: #{inspector.location(keyword_loc)}\n"
  inspector.to_str
end

def keyword

def keyword: () -> String 
def keyword
  keyword_loc.slice
end

def type

def type: () -> Symbol

keys will use a jump table.
you can take advantage of the fact that case statements with all symbol
it uses a single integer comparison, but also because if you're on CRuby
can use for comparison. This is faster than the other approaches because
Instead, you can call #type, which will return to you a symbol that you

method calls, and/or array allocations.
these approaches are relatively slow because of the constant lookups,
case statement and doing `case node; when cls1; when cls2; end`. Both of
calling `[cls1, cls2].include?(node.class)` or putting the node into a
classes to see what kind of behavior to perform. Usually this is done by
Sometimes you want to check an instance of a node against a list of 
def type
  :undef_node
end