Cop idea: Lexically Scoped Action Filter cop

[ydakuka]

Reference: https://rails.rubystyle.guide/#lexically-scoped-action-filter

Actual behavior

I have the code:

# frozen_string_literal: true

class UsersController < ApplicationController
  before_action :require_login, only: :export
end

I will run rubocop and not get any offences:

ydakuka@yauhenid:~/Work/project$ bin/rails_docker rubocop app/controllers/users_controller.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

Rubocop

ydakuka@yauhenid:~/Work/project$ bin/rails_docker rubocop -V
1.55.1 (using Parser 3.2.2.3, rubocop-ast 1.29.0, running on ruby 2.7.8) [x86_64-linux]
  - rubocop-capybara 2.18.0
  - rubocop-factory_bot 2.23.1
  - rubocop-performance 1.18.0
  - rubocop-rails 2.20.2
  - rubocop-rake 0.6.0
  - rubocop-rspec 2.23.0
  - rubocop-thread_safety 0.5.1