Address code review feedback

Changes based on PR review comments:

1. Add logging when skipping generate_packs due to shakapacker hook
   - Now prints message during assets:precompile to inform users

2. Document PackGenerator design decisions
   - Explain why it delegates to Rake task (stable interface)
   - Clarify two execution strategies (direct vs bundle exec)
   - Justify class naming as semantic wrapper

3. Improve error handling documentation
   - Explain why errors are swallowed (fail-safe approach)
   - List possible error types (NoMethodError, TypeError, etc.)
   - Add debug warning when detection fails

4. Add comprehensive test documentation
   - Overview of PackGenerator responsibilities
   - Explanation of what tests cover and why
   - Clear structure for future contributors

5. Reduce cyclomatic complexity
   - Extract helper methods for hook detection
   - Separate concerns (extraction vs validation)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

lib/react_on_rails/configuration.rb

@@ -239,7 +239,9 @@ def adjust_precompile_task
 
       precompile_tasks = lambda {
         # Skip generate_packs if shakapacker has a precompile hook configured
-        unless ReactOnRails::PackerUtils.shakapacker_precompile_hook_configured?
+        if ReactOnRails::PackerUtils.shakapacker_precompile_hook_configured?
+          puts "Skipping react_on_rails:generate_packs (configured in shakapacker precompile hook)"
+        else
           Rake::Task["react_on_rails:generate_packs"].invoke
         end
 

lib/react_on_rails/dev/pack_generator.rb

@@ -5,6 +5,24 @@
 
 module ReactOnRails
   module Dev
+    # PackGenerator triggers the generation of React on Rails packs
+    #
+    # Design decisions:
+    # 1. Why trigger via Rake task instead of direct Ruby code?
+    #    - The actual pack generation logic lives in lib/react_on_rails/packs_generator.rb
+    #    - The rake task (lib/tasks/generate_packs.rake) provides a stable, documented interface
+    #    - This allows the implementation to evolve without breaking bin/dev
+    #    - Users can also run the task directly: `rake react_on_rails:generate_packs`
+    #
+    # 2. Why two execution strategies (direct vs bundle exec)?
+    #    - Direct Rake execution: Faster when already in Bundler/Rails context (bin/dev)
+    #    - Bundle exec fallback: Required when called outside Rails context
+    #    - This optimization avoids subprocess overhead in the common case
+    #
+    # 3. Why is the class named "PackGenerator" when it delegates?
+    #    - It's a semantic wrapper around pack generation for the dev workflow
+    #    - Provides a clean API for bin/dev without exposing Rake internals
+    #    - Handles hook detection, error handling, and output formatting
     class PackGenerator
       class << self
         def generate(verbose: false)

lib/react_on_rails/packer_utils.rb

@@ -169,23 +169,38 @@ def self.raise_shakapacker_version_incompatible_for_basic_pack_generation
 
     # Check if shakapacker.yml has a precompile hook configured
     # This prevents react_on_rails from running generate_packs twice
+    #
+    # Returns false if detection fails for any reason (missing shakapacker, malformed config, etc.)
+    # to ensure generate_packs runs rather than being incorrectly skipped
     def self.shakapacker_precompile_hook_configured?
       return false unless defined?(::Shakapacker)
 
+      hooks = extract_precompile_hooks
+      return false if hooks.nil?
+
+      hook_contains_generate_packs?(hooks)
+    rescue StandardError => e
+      # Swallow errors during hook detection to fail safe - if we can't detect the hook,
+      # we should run generate_packs rather than skip it incorrectly.
+      # Possible errors: NoMethodError (config method missing), TypeError (unexpected data structure),
+      # or errors from shakapacker's internal implementation changes
+      warn "Warning: Unable to detect shakapacker precompile hook: #{e.message}" if ENV["DEBUG"]
+      false
+    end
+
+    def self.extract_precompile_hooks
       # Access config data using private :data method since there's no public API
       # to access the raw configuration hash needed for hook detection
       config_data = ::Shakapacker.config.send(:data)
 
       # Try symbol keys first (Shakapacker's internal format), then fall back to string keys
-      hooks = config_data&.dig(:hooks, :precompile) || config_data&.dig("hooks", "precompile")
-
-      return false if hooks.nil?
+      config_data&.dig(:hooks, :precompile) || config_data&.dig("hooks", "precompile")
+    end
 
+    def self.hook_contains_generate_packs?(hooks)
       # Check if any hook contains the generate_packs rake task using word boundary
       # to avoid false positives from comments or similar strings
       Array(hooks).any? { |hook| hook.to_s.match?(/\breact_on_rails:generate_packs\b/) }
-    rescue StandardError
-      false
     end
   end
 end

spec/react_on_rails/dev/pack_generator_spec.rb

@@ -3,6 +3,19 @@
 require_relative "../spec_helper"
 require "react_on_rails/dev/pack_generator"
 
+# Tests for PackGenerator.generate which triggers pack generation for react_on_rails
+#
+# This class is responsible for:
+# 1. Detecting if shakapacker has a precompile hook configured and skipping if so
+# 2. Choosing the optimal execution strategy (direct Rake task vs bundle exec)
+# 3. Handling errors appropriately and providing user-friendly output
+#
+# Test coverage includes:
+# - Shakapacker hook detection (skip generation when hook is configured)
+# - Direct Rake execution in Bundler context (faster, no subprocess overhead)
+# - Fallback to bundle exec when Rails/Bundler not available
+# - Error handling with proper stderr output
+# - Silent mode output suppression
 RSpec.describe ReactOnRails::Dev::PackGenerator do
   describe ".generate" do
     before do