tilde.news/extras/prohibit_safe_navigation.rb

require "rails"
require "rubocop"

unless Rails.env.production?
  module RuboCop
    module Cop
      module Style
        # The "safe navigation" operator &. makes it easier to work with and
        # propagate nil values. This will disallow the use of the safe navigation
        # operator
        #
        # @example
        #
        #   # bad
        #   foo&.bar
        #   a.foo&.bar
        #
        class DisallowSafeNavigation < Cop
          extend TargetRubyVersion

          MSG = "Do not use &.".freeze

          minimum_target_ruby_version 2.3

          def on_csend(node)
            add_offense(node)
          end
        end
      end
    end
  end
end