class RuboCop::Cop::Lint::ToJSON


end
end
JSON.generate([x, y])
def to_json(*_args)
# good, discarding args
end
JSON.generate([x, y], *args)
def to_json(*args)
# good, preserving args
end
JSON.generate([x, y])
def to_json
# bad, incorrect arity
attr_reader :x, :y
class Point
@example
for an optional argument, your method should too.
generation via ‘JSON.generate(your_obj)`. Since `JSON#generate` allows
When overriding `#to_json`, callers may invoke JSON
Checks to make sure `#to_json` includes an optional argument.

def on_def(node) 

def on_def(node)
  return unless node.method?(:to_json) && node.arguments.empty?
  add_offense(node) do |corrector|
    # The following used `*_args` because `to_json(*args)` has
    # an offense of `Lint/UnusedMethodArgument` cop if `*args`
    # is not used.
    corrector.insert_after(node.loc.name, '(*_args)')
  end
end