Add Rubocop cop to flag keyword arguments usage in Sidekiq workers

.rubocop.yml

@@ -28,6 +28,12 @@ AllCops:
     - 'file_hooks/**/*'
   CacheRootDirectory: tmp
 
+Cop/AvoidKeywordArgumentsInSidekiqWorkers:
+  Enabled: true
+  Include:
+    - 'app/workers/**/*'
+    - 'ee/app/workers/**/*'
+
 Cop/StaticTranslationDefinition:
   Enabled: true
   Exclude:

changelogs/unreleased/rubocop-flag-kwargs-in-sidekiq-workers-cop.yml

+---
+title: Add Rubocop cop to flag keyword arguments usage in Sidekiq workers
+merge_request: 31551
+author: Arun Kumar Mohan
+type: added

rubocop/cop/avoid_keyword_arguments_in_sidekiq_workers.rb

+module RuboCop
+  module Cop
+    # Cop that blacklists keyword arguments usage in Sidekiq workers
+    class AvoidKeywordArgumentsInSidekiqWorkers < RuboCop::Cop::Cop
+      MSG = "Do not use keyword arguments in Sidekiq workers. " \
+        "For details, check https://github.com/mperham/sidekiq/issues/2372".freeze
+      OBSERVED_METHOD = :perform
+
+      def on_def(node)
+        return if node.method_name != OBSERVED_METHOD
+
+        node.arguments.each do |argument|
+          if argument.type == :kwarg || argument.type == :kwoptarg
+            add_offense(node, location: :expression)
+          end
+        end
+      end
+    end
+  end
+end

spec/rubocop/cop/avoid_keyword_arguments_in_sidekiq_workers_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'rubocop'
+require 'rubocop/rspec/support'
+require_relative '../../../rubocop/cop/avoid_keyword_arguments_in_sidekiq_workers'
+
+describe RuboCop::Cop::AvoidKeywordArgumentsInSidekiqWorkers do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  it 'flags violation for keyword arguments usage in perform method signature' do
+    expect_offense(<<~RUBY)
+      def perform(id:)
+      ^^^^^^^^^^^^^^^^ Do not use keyword arguments in Sidekiq workers. For details, check https://github.com/mperham/sidekiq/issues/2372
+      end
+    RUBY
+  end
+
+  it 'flags violation for optional keyword arguments usage in perform method signature' do
+    expect_offense(<<~RUBY)
+      def perform(id: nil)
+      ^^^^^^^^^^^^^^^^^^^^ Do not use keyword arguments in Sidekiq workers. For details, check https://github.com/mperham/sidekiq/issues/2372
+      end
+    RUBY
+  end
+
+  it 'does not flag a violation for standard optional arguments usage in perform method signature' do
+    expect_no_offenses(<<~RUBY)
+      def perform(id = nil)
+      end
+    RUBY
+  end
+
+  it 'does not flag a violation for keyword arguments usage in non-perform method signatures' do
+    expect_no_offenses(<<~RUBY)
+      def helper(id:)
+      end
+    RUBY
+  end
+
+  it 'does not flag a violation for optional keyword arguments usage in non-perform method signatures' do
+    expect_no_offenses(<<~RUBY)
+      def helper(id: nil)
+      end
+    RUBY
+  end
+end