Active Support is required differently nowadays

> In order to have the smallest default footprint possible, Active Support loads the minimum dependencies by default. It is broken in small pieces so that only the desired extensions can be loaded.

https://guides.rubyonrails.org/active_support_core_extensions.html#stand-alone-active-support

This was changed in Rails 3, released 2010-08-29.

- We're not using anything from `core_ext/module/introspection`
- We're not using blank or present from `core_ext/object/blank`
- We're not using `autoload`

CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Changed
 
 - Using `permit` matcher without a surrouding `permissions` block now raises a useful error. (#834)
+- Explicitly require less of `active_support` (#834)
 
 ## 2.4.0 (2024-08-26)
 

lib/pundit.rb

@@ -1,12 +1,9 @@
 # frozen_string_literal: true
 
+require "active_support"
+
 require "pundit/version"
 require "pundit/policy_finder"
-require "active_support/concern"
-require "active_support/core_ext/string/inflections"
-require "active_support/core_ext/object/blank"
-require "active_support/core_ext/module/introspection"
-require "active_support/dependencies/autoload"
 require "pundit/authorization"
 require "pundit/context"
 require "pundit/cache_store/null_store"

lib/pundit/policy_finder.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# String#safe_constantize, String#demodulize, String#underscore, String#camelize
+require "active_support/core_ext/string/inflections"
+
 module Pundit
   # Finds policy and scope classes for given object.
   # @api public

lib/pundit/rspec.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# Array#to_sentence
+require "active_support/core_ext/array/conversions"
+
 module Pundit
   module RSpec
     module Matchers

spec/spec_helper.rb

@@ -9,8 +9,7 @@
 
 require "pundit"
 require "pundit/rspec"
-require "active_support"
-require "active_model"
+require "active_model/naming"
 
 # Load all supporting files: models, policies, etc.
 require "zeitwerk"
@@ -20,3 +19,5 @@
 loader.push_dir(File.expand_path("support/lib", __dir__))
 loader.setup
 loader.eager_load
+
+puts $LOADED_FEATURES.grep(%r{active_support/core_ext}).join("\n")