class RuboCop::Cop::Style::DefWithParentheses

end
# does a thing
def Baz.foo
# good
end
# does a thing
def Baz.foo()
# bad
@example
def foo() does_a_thing end
# also good
end
# does a thing
def foo
# good
end
# does a thing
def foo()
# bad
@example
class/singleton methods are checked.
that does not take any arguments. Both instance and
This cop checks for parentheses in the definition of a method,

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.remove(node.loc.begin)
    corrector.remove(node.loc.end)
  end
end

def on_def(node) 

def on_def(node)
  return if node.single_line?
  return unless !node.arguments? && node.arguments.loc.begin
  add_offense(node.arguments, location: :begin)
end