diff --git a/Library/Homebrew/cli/args.rb b/Library/Homebrew/cli/args.rb
index 709a84e77f1f7..648cd3aa71c76 100644
--- a/Library/Homebrew/cli/args.rb
+++ b/Library/Homebrew/cli/args.rb
@@ -19,9 +19,6 @@ class Args < OpenStruct
       sig { returns(T::Array[String]) }
       attr_reader :options_only, :flags_only
 
-      # undefine tap to allow --tap argument
-      undef tap
-
       sig { void }
       def initialize
         require "cli/named_args"
diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index 79db0ede47a37..af8bec643791d 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -24,6 +24,9 @@ class Parser
       }.freeze, T::Hash[Symbol, String])
       private_constant :ArgType, :HIDDEN_DESC_PLACEHOLDER, :SYMBOL_TO_USAGE_MAPPING
 
+      sig { returns(Args) }
+      attr_reader :args
+
       sig { returns(Args::OptionsType) }
       attr_reader :processed_options
 
diff --git a/Library/Homebrew/extend/os/linux/cleanup.rb b/Library/Homebrew/extend/os/linux/cleanup.rb
index b6cd428fe88d6..be63e0e558298 100644
--- a/Library/Homebrew/extend/os/linux/cleanup.rb
+++ b/Library/Homebrew/extend/os/linux/cleanup.rb
@@ -1,23 +1,29 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  class Cleanup
-    undef use_system_ruby?
+module OS
+  module Linux
+    module Cleanup
+      extend T::Helpers
 
-    sig { returns(T::Boolean) }
-    def use_system_ruby?
-      return false if Homebrew::EnvConfig.force_vendor_ruby?
+      requires_ancestor { Homebrew::Cleanup }
 
-      rubies = [which("ruby"), which("ruby", ORIGINAL_PATHS)].compact
-      system_ruby = Pathname.new("/usr/bin/ruby")
-      rubies << system_ruby if system_ruby.exist?
+      sig { returns(T::Boolean) }
+      def use_system_ruby?
+        return false if Homebrew::EnvConfig.force_vendor_ruby?
 
-      check_ruby_version = HOMEBREW_LIBRARY_PATH/"utils/ruby_check_version_script.rb"
-      rubies.uniq.any? do |ruby|
-        quiet_system ruby, "--enable-frozen-string-literal", "--disable=gems,did_you_mean,rubyopt",
-                     check_ruby_version, RUBY_VERSION
+        rubies = [which("ruby"), which("ruby", ORIGINAL_PATHS)].compact
+        system_ruby = Pathname.new("/usr/bin/ruby")
+        rubies << system_ruby if system_ruby.exist?
+
+        check_ruby_version = HOMEBREW_LIBRARY_PATH/"utils/ruby_check_version_script.rb"
+        rubies.uniq.any? do |ruby|
+          quiet_system ruby, "--enable-frozen-string-literal", "--disable=gems,did_you_mean,rubyopt",
+                       check_ruby_version, RUBY_VERSION
+        end
       end
     end
   end
 end
+
+Homebrew::Cleanup.prepend(OS::Linux::Cleanup)
diff --git a/Library/Homebrew/extend/os/linux/cli/parser.rb b/Library/Homebrew/extend/os/linux/cli/parser.rb
new file mode 100644
index 0000000000000..e5fd59e146cb9
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/cli/parser.rb
@@ -0,0 +1,31 @@
+# typed: strict
+# frozen_string_literal: true
+
+module OS
+  module Linux
+    module CLI
+      module Parser
+        extend T::Helpers
+
+        requires_ancestor { Homebrew::CLI::Parser }
+
+        sig { void }
+        def set_default_options
+          args["formula?"] = true if args.respond_to?(:formula?)
+        end
+
+        sig { void }
+        def validate_options
+          return unless args.respond_to?(:cask?)
+          return unless args.cask?
+
+          # NOTE: We don't raise an error here because we don't want
+          #       to print the help page or a stack trace.
+          odie "Invalid `--cask` usage: Casks do not work on Linux"
+        end
+      end
+    end
+  end
+end
+
+Homebrew::CLI::Parser.prepend(OS::Linux::CLI::Parser)
diff --git a/Library/Homebrew/extend/os/linux/formula.rb b/Library/Homebrew/extend/os/linux/formula.rb
index a6914a1f02c54..4af57d02c9eef 100644
--- a/Library/Homebrew/extend/os/linux/formula.rb
+++ b/Library/Homebrew/extend/os/linux/formula.rb
@@ -1,52 +1,56 @@
 # typed: true # rubocop:disable Sorbet/StrictSigil
 # frozen_string_literal: true
 
-class Formula
-  undef shared_library
-  undef loader_path
-  undef deuniversalize_machos
-  undef add_global_deps_to_spec
-  undef valid_platform?
-
-  sig { params(name: String, version: T.nilable(T.any(String, Integer))).returns(String) }
-  def shared_library(name, version = nil)
-    suffix = if version == "*" || (name == "*" && version.blank?)
-      "{,.*}"
-    elsif version.present?
-      ".#{version}"
-    end
-    "#{name}.so#{suffix}"
-  end
+module OS
+  module Linux
+    module Formula
+      extend T::Helpers
 
-  sig { returns(String) }
-  def loader_path
-    "$ORIGIN"
-  end
+      requires_ancestor { ::Formula }
 
-  sig { params(targets: T.nilable(T.any(Pathname, String))).void }
-  def deuniversalize_machos(*targets); end
-
-  sig { params(spec: SoftwareSpec).void }
-  def add_global_deps_to_spec(spec)
-    return unless DevelopmentTools.needs_build_formulae?
-
-    @global_deps ||= begin
-      dependency_collector = spec.dependency_collector
-      related_formula_names = Set.new([
-        name,
-        *aliases,
-        *versioned_formulae_names,
-      ])
-      [
-        dependency_collector.gcc_dep_if_needed(related_formula_names),
-        dependency_collector.glibc_dep_if_needed(related_formula_names),
-      ].compact.freeze
-    end
-    @global_deps.each { |dep| spec.dependency_collector.add(dep) }
-  end
+      sig { params(name: String, version: T.nilable(T.any(String, Integer))).returns(String) }
+      def shared_library(name, version = nil)
+        suffix = if version == "*" || (name == "*" && version.blank?)
+          "{,.*}"
+        elsif version.present?
+          ".#{version}"
+        end
+        "#{name}.so#{suffix}"
+      end
+
+      sig { returns(String) }
+      def loader_path
+        "$ORIGIN"
+      end
 
-  sig { returns(T::Boolean) }
-  def valid_platform?
-    requirements.none?(MacOSRequirement)
+      sig { params(targets: T.nilable(T.any(Pathname, String))).void }
+      def deuniversalize_machos(*targets); end
+
+      sig { params(spec: SoftwareSpec).void }
+      def add_global_deps_to_spec(spec)
+        return unless DevelopmentTools.needs_build_formulae?
+
+        @global_deps ||= begin
+          dependency_collector = spec.dependency_collector
+          related_formula_names = Set.new([
+            name,
+            *aliases,
+            *versioned_formulae_names,
+          ])
+          [
+            dependency_collector.gcc_dep_if_needed(related_formula_names),
+            dependency_collector.glibc_dep_if_needed(related_formula_names),
+          ].compact.freeze
+        end
+        @global_deps.each { |dep| spec.dependency_collector.add(dep) }
+      end
+
+      sig { returns(T::Boolean) }
+      def valid_platform?
+        requirements.none?(MacOSRequirement)
+      end
+    end
   end
 end
+
+Formula.prepend(OS::Linux::Formula)
diff --git a/Library/Homebrew/extend/os/linux/parser.rb b/Library/Homebrew/extend/os/linux/parser.rb
deleted file mode 100644
index 7d81e2dddc867..0000000000000
--- a/Library/Homebrew/extend/os/linux/parser.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-module Homebrew
-  module CLI
-    class Parser
-      undef set_default_options
-      undef validate_options
-
-      def set_default_options
-        @args["formula?"] = true if @args.respond_to?(:formula?)
-      end
-
-      def validate_options
-        return unless @args.respond_to?(:cask?)
-        return unless @args.cask?
-
-        # NOTE: We don't raise an error here because we don't want
-        #       to print the help page or a stack trace.
-        odie "Invalid `--cask` usage: Casks do not work on Linux"
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/extend/os/mac/cleaner.rb b/Library/Homebrew/extend/os/mac/cleaner.rb
index 460169c996214..303500fa5e1f6 100644
--- a/Library/Homebrew/extend/os/mac/cleaner.rb
+++ b/Library/Homebrew/extend/os/mac/cleaner.rb
@@ -1,13 +1,17 @@
 # typed: strict
 # frozen_string_literal: true
 
-class Cleaner
-  private
+module OS
+  module Mac
+    module Cleaner
+      private
 
-  undef executable_path?
-
-  sig { params(path: Pathname).returns(T::Boolean) }
-  def executable_path?(path)
-    path.mach_o_executable? || path.text_executable?
+      sig { params(path: Pathname).returns(T::Boolean) }
+      def executable_path?(path)
+        path.mach_o_executable? || path.text_executable?
+      end
+    end
   end
 end
+
+Cleaner.prepend(OS::Mac::Cleaner)
diff --git a/Library/Homebrew/extend/os/mac/cleanup.rb b/Library/Homebrew/extend/os/mac/cleanup.rb
index 3565e162b4f4b..08b4ec01454d2 100644
--- a/Library/Homebrew/extend/os/mac/cleanup.rb
+++ b/Library/Homebrew/extend/os/mac/cleanup.rb
@@ -1,15 +1,17 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  class Cleanup
-    undef use_system_ruby?
+module OS
+  module Mac
+    module Cleanup
+      sig { returns(T::Boolean) }
+      def use_system_ruby?
+        return false if Homebrew::EnvConfig.force_vendor_ruby?
 
-    sig { returns(T::Boolean) }
-    def use_system_ruby?
-      return false if Homebrew::EnvConfig.force_vendor_ruby?
-
-      Homebrew::EnvConfig.developer? && ENV["HOMEBREW_USE_RUBY_FROM_PATH"].present?
+        Homebrew::EnvConfig.developer? && ENV["HOMEBREW_USE_RUBY_FROM_PATH"].present?
+      end
     end
   end
 end
+
+Homebrew::Cleanup.prepend(OS::Mac::Cleanup)
diff --git a/Library/Homebrew/extend/os/mac/dev-cmd/bottle.rb b/Library/Homebrew/extend/os/mac/dev-cmd/bottle.rb
index 26d96cc1ceb63..9d07b436956cd 100644
--- a/Library/Homebrew/extend/os/mac/dev-cmd/bottle.rb
+++ b/Library/Homebrew/extend/os/mac/dev-cmd/bottle.rb
@@ -1,26 +1,26 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  module DevCmd
-    class Bottle < AbstractCommand
-      undef tar_args
-
-      sig { returns(T::Array[String]) }
-      def tar_args
-        if MacOS.version >= :catalina
-          ["--no-mac-metadata", "--no-acls", "--no-xattrs"].freeze
-        else
-          [].freeze
+module OS
+  module Mac
+    module DevCmd
+      module Bottle
+        sig { returns(T::Array[String]) }
+        def tar_args
+          if MacOS.version >= :catalina
+            ["--no-mac-metadata", "--no-acls", "--no-xattrs"].freeze
+          else
+            [].freeze
+          end
         end
-      end
-
-      undef gnu_tar
 
-      sig { params(gnu_tar_formula: Formula).returns(String) }
-      def gnu_tar(gnu_tar_formula)
-        "#{gnu_tar_formula.opt_bin}/gtar"
+        sig { params(gnu_tar_formula: Formula).returns(String) }
+        def gnu_tar(gnu_tar_formula)
+          "#{gnu_tar_formula.opt_bin}/gtar"
+        end
       end
     end
   end
 end
+
+Homebrew::DevCmd::Bottle.prepend(OS::Mac::DevCmd::Bottle)
diff --git a/Library/Homebrew/extend/os/mac/formula.rb b/Library/Homebrew/extend/os/mac/formula.rb
index c32a41d9e34c8..4731717dfe475 100644
--- a/Library/Homebrew/extend/os/mac/formula.rb
+++ b/Library/Homebrew/extend/os/mac/formula.rb
@@ -1,33 +1,39 @@
 # typed: strict
 # frozen_string_literal: true
 
-class Formula
-  undef valid_platform?
-  undef std_cmake_args
+module OS
+  module Mac
+    module Formula
+      extend T::Helpers
 
-  sig { returns(T::Boolean) }
-  def valid_platform?
-    requirements.none?(LinuxRequirement)
-  end
+      requires_ancestor { ::Formula }
+
+      sig { returns(T::Boolean) }
+      def valid_platform?
+        requirements.none?(LinuxRequirement)
+      end
+
+      sig {
+        params(
+          install_prefix: T.any(String, Pathname),
+          install_libdir: T.any(String, Pathname),
+          find_framework: String,
+        ).returns(T::Array[String])
+      }
+      def std_cmake_args(install_prefix: prefix, install_libdir: "lib", find_framework: "LAST")
+        args = generic_std_cmake_args(install_prefix:, install_libdir:, find_framework:)
 
-  sig {
-    params(
-      install_prefix: T.any(String, Pathname),
-      install_libdir: T.any(String, Pathname),
-      find_framework: String,
-    ).returns(T::Array[String])
-  }
-  def std_cmake_args(install_prefix: prefix, install_libdir: "lib", find_framework: "LAST")
-    args = generic_std_cmake_args(install_prefix:, install_libdir:,
-                                  find_framework:)
-
-    # Avoid false positives for clock_gettime support on 10.11.
-    # CMake cache entries for other weak symbols may be added here as needed.
-    args << "-DHAVE_CLOCK_GETTIME:INTERNAL=0" if MacOS.version == "10.11" && MacOS::Xcode.version >= "8.0"
-
-    # Ensure CMake is using the same SDK we are using.
-    args << "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_for_formula(self).path}" if MacOS.sdk_root_needed?
-
-    args
+        # Avoid false positives for clock_gettime support on 10.11.
+        # CMake cache entries for other weak symbols may be added here as needed.
+        args << "-DHAVE_CLOCK_GETTIME:INTERNAL=0" if MacOS.version == "10.11" && MacOS::Xcode.version >= "8.0"
+
+        # Ensure CMake is using the same SDK we are using.
+        args << "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_for_formula(self).path}" if MacOS.sdk_root_needed?
+
+        args
+      end
+    end
   end
 end
+
+Formula.prepend(OS::Mac::Formula)
diff --git a/Library/Homebrew/extend/os/mac/formula_installer.rb b/Library/Homebrew/extend/os/mac/formula_installer.rb
index 89115c871d052..a817d924fb061 100644
--- a/Library/Homebrew/extend/os/mac/formula_installer.rb
+++ b/Library/Homebrew/extend/os/mac/formula_installer.rb
@@ -1,12 +1,20 @@
 # typed: strict
 # frozen_string_literal: true
 
-class FormulaInstaller
-  undef fresh_install?
+module OS
+  module Mac
+    module FormulaInstaller
+      extend T::Helpers
 
-  sig { params(formula: Formula).returns(T.nilable(T::Boolean)) }
-  def fresh_install?(formula)
-    !Homebrew::EnvConfig.developer? && !OS::Mac.version.outdated_release? &&
-      (!installed_as_dependency? || !formula.any_version_installed?)
+      requires_ancestor { ::FormulaInstaller }
+
+      sig { params(formula: Formula).returns(T.nilable(T::Boolean)) }
+      def fresh_install?(formula)
+        !Homebrew::EnvConfig.developer? && !OS::Mac.version.outdated_release? &&
+          (!installed_as_dependency? || !formula.any_version_installed?)
+      end
+    end
   end
 end
+
+FormulaInstaller.prepend(OS::Mac::FormulaInstaller)
diff --git a/Library/Homebrew/extend/os/mac/linkage_checker.rb b/Library/Homebrew/extend/os/mac/linkage_checker.rb
index b48d2b90d325a..b82af034b2121 100644
--- a/Library/Homebrew/extend/os/mac/linkage_checker.rb
+++ b/Library/Homebrew/extend/os/mac/linkage_checker.rb
@@ -1,14 +1,18 @@
 # typed: strict
 # frozen_string_literal: true
 
-class LinkageChecker
-  undef system_libraries_exist_in_cache?
+module OS
+  module Mac
+    module LinkageChecker
+      private
 
-  private
-
-  sig { returns(T::Boolean) }
-  def system_libraries_exist_in_cache?
-    # In macOS Big Sur and later, system libraries do not exist on-disk and instead exist in a cache.
-    MacOS.version >= :big_sur
+      sig { returns(T::Boolean) }
+      def system_libraries_exist_in_cache?
+        # In macOS Big Sur and later, system libraries do not exist on-disk and instead exist in a cache.
+        MacOS.version >= :big_sur
+      end
+    end
   end
 end
+
+LinkageChecker.prepend(OS::Mac::LinkageChecker)
diff --git a/Library/Homebrew/extend/os/mac/readall.rb b/Library/Homebrew/extend/os/mac/readall.rb
index 6957c2b086c36..4ad0cd1a05f2f 100644
--- a/Library/Homebrew/extend/os/mac/readall.rb
+++ b/Library/Homebrew/extend/os/mac/readall.rb
@@ -1,39 +1,46 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Readall
-  class << self
-    undef valid_casks?
+module OS
+  module Mac
+    module Readall
+      extend T::Helpers
 
-    def valid_casks?(tap, os_name: nil, arch: Hardware::CPU.type)
-      return true if os_name == :linux
+      requires_ancestor { Kernel }
 
-      current_macos_version = if os_name.is_a?(Symbol)
-        MacOSVersion.from_symbol(os_name)
-      else
-        MacOS.version
-      end
-
-      success = T.let(true, T::Boolean)
-      tap.cask_files.each do |file|
-        cask = Cask::CaskLoader.load(file)
+      sig { params(tap: Tap, os_name: T.nilable(Symbol), arch: T.nilable(Symbol)).returns(T::Boolean) }
+      def valid_casks?(tap, os_name: nil, arch: Hardware::CPU.type)
+        return true if os_name == :linux
 
-        # Fine to have missing URLs for unsupported macOS
-        macos_req = cask.depends_on.macos
-        next if macos_req&.version && Array(macos_req.version).none? do |macos_version|
-          current_macos_version.compare(macos_req.comparator, macos_version)
+        current_macos_version = if os_name.is_a?(Symbol)
+          MacOSVersion.from_symbol(os_name)
+        else
+          MacOS.version
         end
 
-        raise "Missing URL" if cask.url.nil?
-      rescue Interrupt
-        raise
-      rescue Exception => e # rubocop:disable Lint/RescueException
-        os_and_arch = "macOS #{current_macos_version} on #{arch}"
-        onoe "Invalid cask (#{os_and_arch}): #{file}"
-        $stderr.puts e
-        success = false
+        success = T.let(true, T::Boolean)
+        tap.cask_files.each do |file|
+          cask = Cask::CaskLoader.load(file)
+
+          # Fine to have missing URLs for unsupported macOS
+          macos_req = cask.depends_on.macos
+          next if macos_req&.version && Array(macos_req.version).none? do |macos_version|
+            current_macos_version.compare(macos_req.comparator, macos_version)
+          end
+
+          raise "Missing URL" if cask.url.nil?
+        rescue Interrupt
+          raise
+        rescue Exception => e # rubocop:disable Lint/RescueException
+          os_and_arch = "macOS #{current_macos_version} on #{arch}"
+          onoe "Invalid cask (#{os_and_arch}): #{file}"
+          $stderr.puts e
+          success = false
+        end
+        success
       end
-      success
     end
   end
 end
+
+Readall.singleton_class.prepend(OS::Mac::Readall)
diff --git a/Library/Homebrew/extend/os/mac/simulate_system.rb b/Library/Homebrew/extend/os/mac/simulate_system.rb
index 95bc2ef9ae58b..cba78f44e98f0 100644
--- a/Library/Homebrew/extend/os/mac/simulate_system.rb
+++ b/Library/Homebrew/extend/os/mac/simulate_system.rb
@@ -1,21 +1,22 @@
 # typed: strict
 # frozen_string_literal: true
 
-module Homebrew
-  class SimulateSystem
-    class << self
-      undef simulating_or_running_on_macos?
-      undef current_os
-
+module OS
+  module Mac
+    module SimulateSystem
       sig { returns(T::Boolean) }
       def simulating_or_running_on_macos?
-        os.blank? || [:macos, *MacOSVersion::SYMBOLS.keys].include?(os)
+        return true if Homebrew::SimulateSystem.os.blank?
+
+        [:macos, *MacOSVersion::SYMBOLS.keys].include?(Homebrew::SimulateSystem.os)
       end
 
       sig { returns(Symbol) }
       def current_os
-        os || MacOS.version.to_sym
+        Homebrew::SimulateSystem.os || MacOS.version.to_sym
       end
     end
   end
 end
+
+Homebrew::SimulateSystem.singleton_class.prepend(OS::Mac::SimulateSystem)
diff --git a/Library/Homebrew/extend/os/parser.rb b/Library/Homebrew/extend/os/parser.rb
index eb84af9d0abce..fcf79902524d1 100644
--- a/Library/Homebrew/extend/os/parser.rb
+++ b/Library/Homebrew/extend/os/parser.rb
@@ -1,4 +1,4 @@
 # typed: strict
 # frozen_string_literal: true
 
-require "extend/os/linux/parser" if OS.linux?
+require "extend/os/linux/cli/parser" if OS.linux?
diff --git a/Library/Homebrew/sorbet/config b/Library/Homebrew/sorbet/config
index cd1ae82b7cfab..a55c8dfed4c73 100644
--- a/Library/Homebrew/sorbet/config
+++ b/Library/Homebrew/sorbet/config
@@ -6,5 +6,4 @@
 --ignore=/test/.gem
 --ignore=Formula
 --ignore=Casks
---suppress-error-code=3008
 --suppress-error-code=7019