class RuboCop::Cop::Style::DefWithParentheses

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)
  @corrections << lambda do |corrector|
    corrector.remove(node.loc.begin)
    corrector.remove(node.loc.end)
  end
end

def on_method_def(node, _method_name, args, _body) 

def on_method_def(node, _method_name, args, _body)
  start_line = node.loc.keyword.line
  end_line = node.loc.end.line
  return if start_line == end_line
  add_offense(args, :begin) if args.children == [] && args.loc.begin
end