diff --git a/lib/tapioca.rb b/lib/tapioca.rb
index c2962914f..6229ac023 100644
--- a/lib/tapioca.rb
+++ b/lib/tapioca.rb
@@ -5,13 +5,9 @@
 require "rubygems/user_interaction"
 
 module Tapioca
-  extend T::Sig
-
   @traces = [] #: Array[TracePoint]
 
   class << self
-    extend T::Sig
-
     #: [Result] { -> Result } -> Result
     def silence_warnings(&blk)
       original_verbosity = $VERBOSE
diff --git a/lib/tapioca/bundler_ext/auto_require_hook.rb b/lib/tapioca/bundler_ext/auto_require_hook.rb
index a90b0861b..d630430c8 100644
--- a/lib/tapioca/bundler_ext/auto_require_hook.rb
+++ b/lib/tapioca/bundler_ext/auto_require_hook.rb
@@ -8,13 +8,10 @@ module BundlerExt
     # `Bundler.require`.
     # @requires_ancestor: ::Bundler::Dependency
     module AutoRequireHook
-      extend T::Sig
       @exclude = [] #: Array[String]
       @enabled = false #: bool
 
       class << self
-        extend T::Sig
-
         #: (untyped name) -> bool
         def excluded?(name)
           @exclude.include?(name)
diff --git a/lib/tapioca/cli.rb b/lib/tapioca/cli.rb
index e0a42f854..10b76acfb 100644
--- a/lib/tapioca/cli.rb
+++ b/lib/tapioca/cli.rb
@@ -377,8 +377,6 @@ def __print_version
       @addon_mode = false
 
       class << self
-        extend T::Sig
-
         # Indicates that we are running from the LSP, set using the `addon_mode!` method
         attr_reader :addon_mode
 
diff --git a/lib/tapioca/commands/annotations.rb b/lib/tapioca/commands/annotations.rb
index ee3cf29bf..8e3e7d912 100644
--- a/lib/tapioca/commands/annotations.rb
+++ b/lib/tapioca/commands/annotations.rb
@@ -4,8 +4,6 @@
 module Tapioca
   module Commands
     class Annotations < CommandWithoutTracker
-      extend T::Sig
-
       #: (central_repo_root_uris: Array[String], ?auth: String?, ?netrc_file: String?, ?central_repo_index_path: String, ?typed_overrides: Hash[String, String]) -> void
       def initialize(
         central_repo_root_uris:,
diff --git a/lib/tapioca/commands/check_shims.rb b/lib/tapioca/commands/check_shims.rb
index 47b4105ba..3d8910359 100644
--- a/lib/tapioca/commands/check_shims.rb
+++ b/lib/tapioca/commands/check_shims.rb
@@ -4,7 +4,6 @@
 module Tapioca
   module Commands
     class CheckShims < CommandWithoutTracker
-      extend T::Sig
       include SorbetHelper
       include RBIFilesHelper
 
diff --git a/lib/tapioca/commands/command.rb b/lib/tapioca/commands/command.rb
index 7890bab90..f44d09cc6 100644
--- a/lib/tapioca/commands/command.rb
+++ b/lib/tapioca/commands/command.rb
@@ -5,7 +5,6 @@ module Tapioca
   module Commands
     # @abstract
     class Command
-      extend T::Sig
       class FileWriter < Thor
         include Thor::Actions
       end
diff --git a/lib/tapioca/dsl/compiler.rb b/lib/tapioca/dsl/compiler.rb
index ae8857299..4eca13273 100644
--- a/lib/tapioca/dsl/compiler.rb
+++ b/lib/tapioca/dsl/compiler.rb
@@ -6,8 +6,6 @@ module Dsl
     # @abstract
     #: [ConstantType < Module]
     class Compiler
-      extend T::Sig
-
       include RBIHelper
       include Runtime::Reflection
       extend Runtime::Reflection
@@ -24,8 +22,6 @@ class Compiler
       @@requested_constants = [] #: Array[Module] # rubocop:disable Style/ClassVars
 
       class << self
-        extend T::Sig
-
         #: (Module constant) -> bool
         def handles?(constant)
           processable_constants.include?(constant)
diff --git a/lib/tapioca/dsl/compilers/aasm.rb b/lib/tapioca/dsl/compilers/aasm.rb
index c6bde675f..5e54b8244 100644
--- a/lib/tapioca/dsl/compilers/aasm.rb
+++ b/lib/tapioca/dsl/compilers/aasm.rb
@@ -34,8 +34,6 @@ module Compilers
       #
       #: [ConstantType = (Class[::AASM] & ::AASM::ClassMethods)]
       class AASM < Compiler
-        extend T::Sig
-
         # Taken directly from the AASM::Core::Event class, here:
         # https://github.com/aasm/aasm/blob/0e03746/lib/aasm/core/event.rb#L21-L29
         EVENT_CALLBACKS = [
@@ -200,8 +198,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/action_controller_helpers.rb b/lib/tapioca/dsl/compilers/action_controller_helpers.rb
index 642a3e3fa..932f681c1 100644
--- a/lib/tapioca/dsl/compilers/action_controller_helpers.rb
+++ b/lib/tapioca/dsl/compilers/action_controller_helpers.rb
@@ -63,8 +63,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActionController::Base)]
       class ActionControllerHelpers < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -118,8 +116,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/action_mailer.rb b/lib/tapioca/dsl/compilers/action_mailer.rb
index 5626c0749..837ec2137 100644
--- a/lib/tapioca/dsl/compilers/action_mailer.rb
+++ b/lib/tapioca/dsl/compilers/action_mailer.rb
@@ -31,8 +31,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActionMailer::Base)]
       class ActionMailer < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -51,8 +49,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/action_text.rb b/lib/tapioca/dsl/compilers/action_text.rb
index abbec7256..bb1930334 100644
--- a/lib/tapioca/dsl/compilers/action_text.rb
+++ b/lib/tapioca/dsl/compilers/action_text.rb
@@ -45,8 +45,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class ActionText < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -73,8 +71,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           #: (singleton(::ActiveRecord::Base) constant) -> Array[String]
           def action_text_associations(constant)
             # Implementation copied from https://github.com/rails/rails/blob/31052d0e518b9da103eea2f79d250242ed1e3705/actiontext/lib/action_text/attribute.rb#L66
diff --git a/lib/tapioca/dsl/compilers/active_job.rb b/lib/tapioca/dsl/compilers/active_job.rb
index 83e1bbea4..b99bc3633 100644
--- a/lib/tapioca/dsl/compilers/active_job.rb
+++ b/lib/tapioca/dsl/compilers/active_job.rb
@@ -40,8 +40,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveJob::Base)]
       class ActiveJob < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -85,8 +83,6 @@ def perform_later_parameters(parameters, constant_name)
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_model_attributes.rb b/lib/tapioca/dsl/compilers/active_model_attributes.rb
index f23caa2be..be87d2cf0 100644
--- a/lib/tapioca/dsl/compilers/active_model_attributes.rb
+++ b/lib/tapioca/dsl/compilers/active_model_attributes.rb
@@ -36,8 +36,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Class[::ActiveModel::Attributes] & ::ActiveModel::Attributes::ClassMethods)]
       class ActiveModelAttributes < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -52,8 +50,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_model_secure_password.rb b/lib/tapioca/dsl/compilers/active_model_secure_password.rb
index 4ff58d93b..f824b9096 100644
--- a/lib/tapioca/dsl/compilers/active_model_secure_password.rb
+++ b/lib/tapioca/dsl/compilers/active_model_secure_password.rb
@@ -55,8 +55,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Class[::ActiveModel::SecurePassword] & ::ActiveModel::SecurePassword::ClassMethods)]
       class ActiveModelSecurePassword < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -90,8 +88,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_model_validations_confirmation.rb b/lib/tapioca/dsl/compilers/active_model_validations_confirmation.rb
index 5ecf23503..93ea8bbff 100644
--- a/lib/tapioca/dsl/compilers/active_model_validations_confirmation.rb
+++ b/lib/tapioca/dsl/compilers/active_model_validations_confirmation.rb
@@ -42,8 +42,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Class[ActiveModel::Validations] & ActiveModel::Validations::HelperMethods & ActiveModel::Validations::ClassMethods)]
       class ActiveModelValidationsConfirmation < Compiler
-        extend T::Sig
-
         class << self
           # @override
           #: -> T::Enumerable[Module]
diff --git a/lib/tapioca/dsl/compilers/active_record_associations.rb b/lib/tapioca/dsl/compilers/active_record_associations.rb
index 2b1bc6745..928fe0269 100644
--- a/lib/tapioca/dsl/compilers/active_record_associations.rb
+++ b/lib/tapioca/dsl/compilers/active_record_associations.rb
@@ -103,15 +103,12 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(ActiveRecord::Base)]
       class ActiveRecordAssociations < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         class SourceReflectionError < StandardError
         end
 
         class MissingConstantError < StandardError
-          extend T::Sig
-
           #: String
           attr_reader :class_name
 
@@ -138,8 +135,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_columns.rb b/lib/tapioca/dsl/compilers/active_record_columns.rb
index 51d4a0d24..e2c377c13 100644
--- a/lib/tapioca/dsl/compilers/active_record_columns.rb
+++ b/lib/tapioca/dsl/compilers/active_record_columns.rb
@@ -122,7 +122,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(ActiveRecord::Base)]
       class ActiveRecordColumns < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         # @override
@@ -163,8 +162,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_delegated_types.rb b/lib/tapioca/dsl/compilers/active_record_delegated_types.rb
index accf87a04..42c2fb855 100644
--- a/lib/tapioca/dsl/compilers/active_record_delegated_types.rb
+++ b/lib/tapioca/dsl/compilers/active_record_delegated_types.rb
@@ -65,7 +65,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (singleton(ActiveRecord::Base) & Extensions::ActiveRecord)]
       class ActiveRecordDelegatedTypes < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         # @override
@@ -88,8 +87,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_enum.rb b/lib/tapioca/dsl/compilers/active_record_enum.rb
index 51e8ea196..835b13a2b 100644
--- a/lib/tapioca/dsl/compilers/active_record_enum.rb
+++ b/lib/tapioca/dsl/compilers/active_record_enum.rb
@@ -51,8 +51,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class ActiveRecordEnum < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -75,8 +73,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_fixtures.rb b/lib/tapioca/dsl/compilers/active_record_fixtures.rb
index 13b2ad29d..72b8c92de 100644
--- a/lib/tapioca/dsl/compilers/active_record_fixtures.rb
+++ b/lib/tapioca/dsl/compilers/active_record_fixtures.rb
@@ -35,8 +35,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(ActiveSupport::TestCase)]
       class ActiveRecordFixtures < Compiler
-        extend T::Sig
-
         MISSING = Object.new
 
         # @override
@@ -59,8 +57,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_relations.rb b/lib/tapioca/dsl/compilers/active_record_relations.rb
index 80fba499d..14a3f1b4b 100644
--- a/lib/tapioca/dsl/compilers/active_record_relations.rb
+++ b/lib/tapioca/dsl/compilers/active_record_relations.rb
@@ -150,7 +150,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class ActiveRecordRelations < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
         include SorbetHelper
 
@@ -180,8 +179,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_scope.rb b/lib/tapioca/dsl/compilers/active_record_scope.rb
index f0f3003ca..ef7c12e6f 100644
--- a/lib/tapioca/dsl/compilers/active_record_scope.rb
+++ b/lib/tapioca/dsl/compilers/active_record_scope.rb
@@ -40,7 +40,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class ActiveRecordScope < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         # @override
diff --git a/lib/tapioca/dsl/compilers/active_record_secure_token.rb b/lib/tapioca/dsl/compilers/active_record_secure_token.rb
index 751d132fe..5343d875c 100644
--- a/lib/tapioca/dsl/compilers/active_record_secure_token.rb
+++ b/lib/tapioca/dsl/compilers/active_record_secure_token.rb
@@ -34,7 +34,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (singleton(ActiveRecord::Base) & Extensions::ActiveRecord)]
       class ActiveRecordSecureToken < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         # @override
@@ -57,8 +56,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_store.rb b/lib/tapioca/dsl/compilers/active_record_store.rb
index f0af7eb95..9f6855704 100644
--- a/lib/tapioca/dsl/compilers/active_record_store.rb
+++ b/lib/tapioca/dsl/compilers/active_record_store.rb
@@ -80,7 +80,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (singleton(ActiveRecord::Base) & Extensions::ActiveRecord)]
       class ActiveRecordStore < Compiler
-        extend T::Sig
         include Helpers::ActiveRecordConstantsHelper
 
         # @override
@@ -132,8 +131,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_record_typed_store.rb b/lib/tapioca/dsl/compilers/active_record_typed_store.rb
index f26b1a561..6b8969b75 100644
--- a/lib/tapioca/dsl/compilers/active_record_typed_store.rb
+++ b/lib/tapioca/dsl/compilers/active_record_typed_store.rb
@@ -83,8 +83,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class ActiveRecordTypedStore < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -108,8 +106,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_resource.rb b/lib/tapioca/dsl/compilers/active_resource.rb
index dba664149..555ca2fda 100644
--- a/lib/tapioca/dsl/compilers/active_resource.rb
+++ b/lib/tapioca/dsl/compilers/active_resource.rb
@@ -56,8 +56,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveResource::Base)]
       class ActiveResource < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -71,8 +69,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_storage.rb b/lib/tapioca/dsl/compilers/active_storage.rb
index 60e168b69..653873226 100644
--- a/lib/tapioca/dsl/compilers/active_storage.rb
+++ b/lib/tapioca/dsl/compilers/active_storage.rb
@@ -40,8 +40,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Module & ::ActiveStorage::Reflection::ActiveRecordExtensions::ClassMethods)]
       class ActiveStorage < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -65,8 +63,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_support_concern.rb b/lib/tapioca/dsl/compilers/active_support_concern.rb
index 2b7a723cf..ec381cd7a 100644
--- a/lib/tapioca/dsl/compilers/active_support_concern.rb
+++ b/lib/tapioca/dsl/compilers/active_support_concern.rb
@@ -39,8 +39,6 @@ module Compilers
       # ~~~
       #: [ConstantType = Module]
       class ActiveSupportConcern < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -62,8 +60,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_support_current_attributes.rb b/lib/tapioca/dsl/compilers/active_support_current_attributes.rb
index 9fe6dd1de..806d0cb7b 100644
--- a/lib/tapioca/dsl/compilers/active_support_current_attributes.rb
+++ b/lib/tapioca/dsl/compilers/active_support_current_attributes.rb
@@ -61,8 +61,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveSupport::CurrentAttributes)]
       class ActiveSupportCurrentAttributes < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -94,8 +92,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/active_support_time_ext.rb b/lib/tapioca/dsl/compilers/active_support_time_ext.rb
index b6e8352eb..4ddfe4e6f 100644
--- a/lib/tapioca/dsl/compilers/active_support_time_ext.rb
+++ b/lib/tapioca/dsl/compilers/active_support_time_ext.rb
@@ -36,8 +36,6 @@ module Compilers
       # ```
       #: [ConstantType = singleton(::Time)]
       class ActiveSupportTimeExt < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -55,8 +53,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/config.rb b/lib/tapioca/dsl/compilers/config.rb
index 1ce53c481..78d0392b3 100644
--- a/lib/tapioca/dsl/compilers/config.rb
+++ b/lib/tapioca/dsl/compilers/config.rb
@@ -42,8 +42,6 @@ module Compilers
       # ```
       #: [ConstantType = Module]
       class Config < Compiler
-        extend T::Sig
-
         CONFIG_OPTIONS_SUFFIX = "ConfigOptions"
 
         # @override
@@ -93,8 +91,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/frozen_record.rb b/lib/tapioca/dsl/compilers/frozen_record.rb
index 662f7e521..cc928a314 100644
--- a/lib/tapioca/dsl/compilers/frozen_record.rb
+++ b/lib/tapioca/dsl/compilers/frozen_record.rb
@@ -60,8 +60,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (singleton(::FrozenRecord::Base) & Extensions::FrozenRecord)]
       class FrozenRecord < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -85,8 +83,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/graphql_input_object.rb b/lib/tapioca/dsl/compilers/graphql_input_object.rb
index 42f5e526b..881f04bdd 100644
--- a/lib/tapioca/dsl/compilers/graphql_input_object.rb
+++ b/lib/tapioca/dsl/compilers/graphql_input_object.rb
@@ -36,8 +36,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(GraphQL::Schema::InputObject)]
       class GraphqlInputObject < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -74,8 +72,6 @@ def method_defined_by_graphql?(method_name)
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/graphql_mutation.rb b/lib/tapioca/dsl/compilers/graphql_mutation.rb
index 9caa6a310..3aa192e5b 100644
--- a/lib/tapioca/dsl/compilers/graphql_mutation.rb
+++ b/lib/tapioca/dsl/compilers/graphql_mutation.rb
@@ -37,8 +37,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(GraphQL::Schema::Mutation)]
       class GraphqlMutation < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -71,8 +69,6 @@ def argument_type(argument, constant)
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/identity_cache.rb b/lib/tapioca/dsl/compilers/identity_cache.rb
index c4a92e0a0..e36da8c91 100644
--- a/lib/tapioca/dsl/compilers/identity_cache.rb
+++ b/lib/tapioca/dsl/compilers/identity_cache.rb
@@ -57,8 +57,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::ActiveRecord::Base)]
       class IdentityCache < Compiler
-        extend T::Sig
-
         COLLECTION_TYPE = ->(type) { "T::Array[::#{type}]" } #: ^((Module | String) type) -> String
 
         # @override
@@ -92,8 +90,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/json_api_client_resource.rb b/lib/tapioca/dsl/compilers/json_api_client_resource.rb
index e3610b9d5..a88df362c 100644
--- a/lib/tapioca/dsl/compilers/json_api_client_resource.rb
+++ b/lib/tapioca/dsl/compilers/json_api_client_resource.rb
@@ -81,8 +81,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::JsonApiClient::Resource)]
       class JsonApiClientResource < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -106,8 +104,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/kredis.rb b/lib/tapioca/dsl/compilers/kredis.rb
index fa69b5036..5eac50ea8 100644
--- a/lib/tapioca/dsl/compilers/kredis.rb
+++ b/lib/tapioca/dsl/compilers/kredis.rb
@@ -65,8 +65,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Class[::Kredis::Attributes] & ::Kredis::Attributes::ClassMethods & Extensions::Kredis)]
       class Kredis < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -85,8 +83,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/mixed_in_class_attributes.rb b/lib/tapioca/dsl/compilers/mixed_in_class_attributes.rb
index cf607b269..a9036fd51 100644
--- a/lib/tapioca/dsl/compilers/mixed_in_class_attributes.rb
+++ b/lib/tapioca/dsl/compilers/mixed_in_class_attributes.rb
@@ -46,8 +46,6 @@ module Compilers
       # ~~~
       #: [ConstantType = Module]
       class MixedInClassAttributes < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -60,8 +58,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/protobuf.rb b/lib/tapioca/dsl/compilers/protobuf.rb
index 37ce607be..859a6bffc 100644
--- a/lib/tapioca/dsl/compilers/protobuf.rb
+++ b/lib/tapioca/dsl/compilers/protobuf.rb
@@ -73,8 +73,6 @@ class Field < T::Struct
           prop :default, String
         end
 
-        extend T::Sig
-
         FIELD_RE = /^[a-z_][a-zA-Z0-9_]*$/
 
         # @override
@@ -153,8 +151,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/rails_generators.rb b/lib/tapioca/dsl/compilers/rails_generators.rb
index c5e218670..5643ac309 100644
--- a/lib/tapioca/dsl/compilers/rails_generators.rb
+++ b/lib/tapioca/dsl/compilers/rails_generators.rb
@@ -35,8 +35,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::Rails::Generators::Base)]
       class RailsGenerators < Compiler
-        extend T::Sig
-
         BUILT_IN_MATCHER = /::(ActionMailbox|ActionText|ActiveRecord|Rails)::Generators/
 
         # @override
@@ -57,8 +55,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/sidekiq_worker.rb b/lib/tapioca/dsl/compilers/sidekiq_worker.rb
index b60faf7e1..57a17f7c6 100644
--- a/lib/tapioca/dsl/compilers/sidekiq_worker.rb
+++ b/lib/tapioca/dsl/compilers/sidekiq_worker.rb
@@ -43,8 +43,6 @@ module Compilers
       # * `self.perform_in` will also accept a `ActiveSupport::Duration` value
       #: [ConstantType = singleton(::Sidekiq::Worker)]
       class SidekiqWorker < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -84,8 +82,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/smart_properties.rb b/lib/tapioca/dsl/compilers/smart_properties.rb
index cd0472df7..9404f9d0d 100644
--- a/lib/tapioca/dsl/compilers/smart_properties.rb
+++ b/lib/tapioca/dsl/compilers/smart_properties.rb
@@ -56,8 +56,6 @@ module Compilers
       # ~~~
       #: [ConstantType = singleton(::SmartProperties)]
       class SmartProperties < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -77,8 +75,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/state_machines.rb b/lib/tapioca/dsl/compilers/state_machines.rb
index 319bd8425..459c03edd 100644
--- a/lib/tapioca/dsl/compilers/state_machines.rb
+++ b/lib/tapioca/dsl/compilers/state_machines.rb
@@ -111,8 +111,6 @@ module Compilers
       # ~~~
       #: [ConstantType = (Module & ::StateMachines::ClassMethods)]
       class StateMachines < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -155,8 +153,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
-
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/compilers/url_helpers.rb b/lib/tapioca/dsl/compilers/url_helpers.rb
index a954046ae..676278338 100644
--- a/lib/tapioca/dsl/compilers/url_helpers.rb
+++ b/lib/tapioca/dsl/compilers/url_helpers.rb
@@ -80,8 +80,6 @@ module Compilers
       # ~~~
       #: [ConstantType = Module]
       class UrlHelpers < Compiler
-        extend T::Sig
-
         # @override
         #: -> void
         def decorate
@@ -97,7 +95,6 @@ def decorate
         end
 
         class << self
-          extend T::Sig
           # @override
           #: -> T::Enumerable[Module]
           def gather_constants
diff --git a/lib/tapioca/dsl/helpers/active_model_type_helper.rb b/lib/tapioca/dsl/helpers/active_model_type_helper.rb
index 092e05ca4..4fa9bdadf 100644
--- a/lib/tapioca/dsl/helpers/active_model_type_helper.rb
+++ b/lib/tapioca/dsl/helpers/active_model_type_helper.rb
@@ -6,8 +6,6 @@ module Dsl
     module Helpers
       module ActiveModelTypeHelper
         class << self
-          extend T::Sig
-
           # Returns the type indicated by the custom ActiveModel::Type::Value.
           # Accepts subclasses of ActiveModel::Type::Value as well as classes that implement similar methods.
           #: (untyped type_value) -> String
diff --git a/lib/tapioca/dsl/helpers/active_record_column_type_helper.rb b/lib/tapioca/dsl/helpers/active_record_column_type_helper.rb
index 9fa8db4a9..9fed74c04 100644
--- a/lib/tapioca/dsl/helpers/active_record_column_type_helper.rb
+++ b/lib/tapioca/dsl/helpers/active_record_column_type_helper.rb
@@ -7,12 +7,9 @@ module Tapioca
   module Dsl
     module Helpers
       class ActiveRecordColumnTypeHelper
-        extend T::Sig
         include RBIHelper
 
         class ColumnTypeOption < T::Enum
-          extend T::Sig
-
           enums do
             Untyped = new("untyped")
             Nilable = new("nilable")
@@ -20,8 +17,6 @@ class ColumnTypeOption < T::Enum
           end
 
           class << self
-            extend T::Sig
-
             #: (Hash[String, untyped] options) { (String value, ColumnTypeOption default_column_type_option) -> void } -> ColumnTypeOption
             def from_options(options, &block)
               column_type_option = Persisted
diff --git a/lib/tapioca/dsl/helpers/active_record_constants_helper.rb b/lib/tapioca/dsl/helpers/active_record_constants_helper.rb
index 5bbee4f85..1325a16f2 100644
--- a/lib/tapioca/dsl/helpers/active_record_constants_helper.rb
+++ b/lib/tapioca/dsl/helpers/active_record_constants_helper.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Dsl
     module Helpers
       module ActiveRecordConstantsHelper
-        extend T::Sig
-
         ReflectionType = T.type_alias do
           T.any(::ActiveRecord::Reflection::ThroughReflection, ::ActiveRecord::Reflection::AssociationReflection)
         end
diff --git a/lib/tapioca/dsl/helpers/graphql_type_helper.rb b/lib/tapioca/dsl/helpers/graphql_type_helper.rb
index 134d4156c..1cad8ace6 100644
--- a/lib/tapioca/dsl/helpers/graphql_type_helper.rb
+++ b/lib/tapioca/dsl/helpers/graphql_type_helper.rb
@@ -7,8 +7,6 @@ module Helpers
       module GraphqlTypeHelper
         extend self
 
-        extend T::Sig
-
         #: (GraphQL::Schema::Argument argument, (singleton(GraphQL::Schema::Mutation) | singleton(GraphQL::Schema::InputObject)) constant) -> String
         def type_for_argument(argument, constant)
           type = if argument.loads
diff --git a/lib/tapioca/dsl/pipeline.rb b/lib/tapioca/dsl/pipeline.rb
index ed63e4abe..c455d8942 100644
--- a/lib/tapioca/dsl/pipeline.rb
+++ b/lib/tapioca/dsl/pipeline.rb
@@ -4,8 +4,6 @@
 module Tapioca
   module Dsl
     class Pipeline
-      extend T::Sig
-
       #: T::Enumerable[singleton(Compiler)]
       attr_reader :active_compilers
 
diff --git a/lib/tapioca/executor.rb b/lib/tapioca/executor.rb
index 75f40530e..13243ad38 100644
--- a/lib/tapioca/executor.rb
+++ b/lib/tapioca/executor.rb
@@ -3,8 +3,6 @@
 
 module Tapioca
   class Executor
-    extend T::Sig
-
     MINIMUM_ITEMS_PER_WORKER = 2 #: Integer
 
     #: (Array[untyped] queue, ?number_of_workers: Integer?) -> void
diff --git a/lib/tapioca/gem/events.rb b/lib/tapioca/gem/events.rb
index ab2cf7404..a4464a7bd 100644
--- a/lib/tapioca/gem/events.rb
+++ b/lib/tapioca/gem/events.rb
@@ -5,12 +5,9 @@ module Tapioca
   module Gem
     # @abstract
     class Event
-      extend T::Sig
     end
 
     class SymbolFound < Event
-      extend T::Sig
-
       #: String
       attr_reader :symbol
 
@@ -22,8 +19,6 @@ def initialize(symbol)
     end
 
     class ConstantFound < Event
-      extend T::Sig
-
       #: String
       attr_reader :symbol
 
@@ -41,8 +36,6 @@ def initialize(symbol, constant)
     end
 
     class ForeignConstantFound < ConstantFound
-      extend T::Sig
-
       # @override
       #: -> Module
       def constant
@@ -57,8 +50,6 @@ def initialize(symbol, constant)
 
     # @abstract
     class NodeAdded < Event
-      extend T::Sig
-
       #: String
       attr_reader :symbol
 
@@ -74,8 +65,6 @@ def initialize(symbol, constant)
     end
 
     class ConstNodeAdded < NodeAdded
-      extend T::Sig
-
       #: RBI::Const
       attr_reader :node
 
@@ -87,8 +76,6 @@ def initialize(symbol, constant, node)
     end
 
     class ScopeNodeAdded < NodeAdded
-      extend T::Sig
-
       #: RBI::Scope
       attr_reader :node
 
@@ -102,8 +89,6 @@ def initialize(symbol, constant, node)
     class ForeignScopeNodeAdded < ScopeNodeAdded; end
 
     class MethodNodeAdded < NodeAdded
-      extend T::Sig
-
       #: UnboundMethod
       attr_reader :method
 
diff --git a/lib/tapioca/gem/listeners/base.rb b/lib/tapioca/gem/listeners/base.rb
index 9fa317b4b..cf5c99904 100644
--- a/lib/tapioca/gem/listeners/base.rb
+++ b/lib/tapioca/gem/listeners/base.rb
@@ -6,7 +6,6 @@ module Gem
     module Listeners
       # @abstract
       class Base
-        extend T::Sig
         #: (Pipeline pipeline) -> void
         def initialize(pipeline)
           @pipeline = pipeline
diff --git a/lib/tapioca/gem/listeners/dynamic_mixins.rb b/lib/tapioca/gem/listeners/dynamic_mixins.rb
index df4176b4d..f7aff1e1e 100644
--- a/lib/tapioca/gem/listeners/dynamic_mixins.rb
+++ b/lib/tapioca/gem/listeners/dynamic_mixins.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class DynamicMixins < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/foreign_constants.rb b/lib/tapioca/gem/listeners/foreign_constants.rb
index 359d2292d..e7ab3bdd9 100644
--- a/lib/tapioca/gem/listeners/foreign_constants.rb
+++ b/lib/tapioca/gem/listeners/foreign_constants.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class ForeignConstants < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/methods.rb b/lib/tapioca/gem/listeners/methods.rb
index acae389d9..44ac480e2 100644
--- a/lib/tapioca/gem/listeners/methods.rb
+++ b/lib/tapioca/gem/listeners/methods.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class Methods < Base
-        extend T::Sig
-
         include RBIHelper
         include Runtime::Reflection
 
diff --git a/lib/tapioca/gem/listeners/mixins.rb b/lib/tapioca/gem/listeners/mixins.rb
index 5a95d6982..66dedc996 100644
--- a/lib/tapioca/gem/listeners/mixins.rb
+++ b/lib/tapioca/gem/listeners/mixins.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class Mixins < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/remove_empty_payload_scopes.rb b/lib/tapioca/gem/listeners/remove_empty_payload_scopes.rb
index 845d74b64..501c087c7 100644
--- a/lib/tapioca/gem/listeners/remove_empty_payload_scopes.rb
+++ b/lib/tapioca/gem/listeners/remove_empty_payload_scopes.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class RemoveEmptyPayloadScopes < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/sorbet_enums.rb b/lib/tapioca/gem/listeners/sorbet_enums.rb
index a448dd299..bd3b60218 100644
--- a/lib/tapioca/gem/listeners/sorbet_enums.rb
+++ b/lib/tapioca/gem/listeners/sorbet_enums.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetEnums < Base
-        extend T::Sig
-
         private
 
         # @override
diff --git a/lib/tapioca/gem/listeners/sorbet_helpers.rb b/lib/tapioca/gem/listeners/sorbet_helpers.rb
index 587b7da00..7b0a289c2 100644
--- a/lib/tapioca/gem/listeners/sorbet_helpers.rb
+++ b/lib/tapioca/gem/listeners/sorbet_helpers.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetHelpers < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/sorbet_props.rb b/lib/tapioca/gem/listeners/sorbet_props.rb
index 8e3ff70f5..e9858149f 100644
--- a/lib/tapioca/gem/listeners/sorbet_props.rb
+++ b/lib/tapioca/gem/listeners/sorbet_props.rb
@@ -5,7 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetProps < Base
-        extend T::Sig
         include RBIHelper
 
         private
diff --git a/lib/tapioca/gem/listeners/sorbet_required_ancestors.rb b/lib/tapioca/gem/listeners/sorbet_required_ancestors.rb
index e554f2a30..7033a7ddb 100644
--- a/lib/tapioca/gem/listeners/sorbet_required_ancestors.rb
+++ b/lib/tapioca/gem/listeners/sorbet_required_ancestors.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetRequiredAncestors < Base
-        extend T::Sig
-
         private
 
         # @override
diff --git a/lib/tapioca/gem/listeners/sorbet_signatures.rb b/lib/tapioca/gem/listeners/sorbet_signatures.rb
index 81f115b35..4b3b1d4d0 100644
--- a/lib/tapioca/gem/listeners/sorbet_signatures.rb
+++ b/lib/tapioca/gem/listeners/sorbet_signatures.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetSignatures < Base
-        extend T::Sig
-
         include Runtime::Reflection
         include RBIHelper
 
diff --git a/lib/tapioca/gem/listeners/sorbet_type_variables.rb b/lib/tapioca/gem/listeners/sorbet_type_variables.rb
index c71df2a5f..43024b583 100644
--- a/lib/tapioca/gem/listeners/sorbet_type_variables.rb
+++ b/lib/tapioca/gem/listeners/sorbet_type_variables.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SorbetTypeVariables < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/source_location.rb b/lib/tapioca/gem/listeners/source_location.rb
index 423ffceac..5654a7631 100644
--- a/lib/tapioca/gem/listeners/source_location.rb
+++ b/lib/tapioca/gem/listeners/source_location.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class SourceLocation < Base
-        extend T::Sig
-
         private
 
         # @override
diff --git a/lib/tapioca/gem/listeners/subconstants.rb b/lib/tapioca/gem/listeners/subconstants.rb
index 0499cc595..0d8636cb7 100644
--- a/lib/tapioca/gem/listeners/subconstants.rb
+++ b/lib/tapioca/gem/listeners/subconstants.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class Subconstants < Base
-        extend T::Sig
-
         include Runtime::Reflection
 
         private
diff --git a/lib/tapioca/gem/listeners/yard_doc.rb b/lib/tapioca/gem/listeners/yard_doc.rb
index 3b58809e2..5a13c7c03 100644
--- a/lib/tapioca/gem/listeners/yard_doc.rb
+++ b/lib/tapioca/gem/listeners/yard_doc.rb
@@ -5,8 +5,6 @@ module Tapioca
   module Gem
     module Listeners
       class YardDoc < Base
-        extend T::Sig
-
         IGNORED_COMMENTS = [
           ":doc:",
           ":nodoc:",
diff --git a/lib/tapioca/gem/pipeline.rb b/lib/tapioca/gem/pipeline.rb
index b6b80d821..1efae85ee 100644
--- a/lib/tapioca/gem/pipeline.rb
+++ b/lib/tapioca/gem/pipeline.rb
@@ -4,7 +4,6 @@
 module Tapioca
   module Gem
     class Pipeline
-      extend T::Sig
       include Runtime::Reflection
       include RBIHelper
 
diff --git a/lib/tapioca/gemfile.rb b/lib/tapioca/gemfile.rb
index e3229fdd0..baf1c0fe1 100644
--- a/lib/tapioca/gemfile.rb
+++ b/lib/tapioca/gemfile.rb
@@ -107,8 +107,6 @@ class GemSpec
       include GemHelper
 
       class << self
-        extend T::Sig
-
         #: -> Hash[String, Gemfile::GemSpec]
         def spec_lookup_by_file_path
           @lookup ||= [*::Gem::Specification.default_stubs, *::Gem::Specification.stubs]
diff --git a/lib/tapioca/helpers/cli_helper.rb b/lib/tapioca/helpers/cli_helper.rb
index 62e19b27a..67f4fb19e 100644
--- a/lib/tapioca/helpers/cli_helper.rb
+++ b/lib/tapioca/helpers/cli_helper.rb
@@ -4,7 +4,6 @@
 module Tapioca
   # @requires_ancestor: Thor::Shell
   module CliHelper
-    extend T::Sig
     #: (?String message, *(Symbol | Array[Symbol]) color) -> void
     def say_error(message = "", *color)
       # Thor has its own `say_error` now, but it has two problems:
diff --git a/lib/tapioca/helpers/config_helper.rb b/lib/tapioca/helpers/config_helper.rb
index dedb9a63b..197f323a3 100644
--- a/lib/tapioca/helpers/config_helper.rb
+++ b/lib/tapioca/helpers/config_helper.rb
@@ -4,7 +4,6 @@
 module Tapioca
   # @requires_ancestor: Thor
   module ConfigHelper
-    extend T::Sig
     #: String
     attr_reader :command_name
 
diff --git a/lib/tapioca/helpers/env_helper.rb b/lib/tapioca/helpers/env_helper.rb
index 743ca535b..9bb45023a 100644
--- a/lib/tapioca/helpers/env_helper.rb
+++ b/lib/tapioca/helpers/env_helper.rb
@@ -4,7 +4,6 @@
 module Tapioca
   # @requires_ancestor: Thor
   module EnvHelper
-    extend T::Sig
     #: (Hash[Symbol, untyped] options) -> void
     def set_environment(options) # rubocop:disable Naming/AccessorMethodName
       ENV["RAILS_ENV"] = ENV["RACK_ENV"] = options[:environment]
diff --git a/lib/tapioca/helpers/gem_helper.rb b/lib/tapioca/helpers/gem_helper.rb
index 64b9525b0..cb995503c 100644
--- a/lib/tapioca/helpers/gem_helper.rb
+++ b/lib/tapioca/helpers/gem_helper.rb
@@ -3,8 +3,6 @@
 
 module Tapioca
   module GemHelper
-    extend T::Sig
-
     #: ((String | Pathname) app_dir, String full_gem_path) -> bool
     def gem_in_app_dir?(app_dir, full_gem_path)
       app_dir = to_realpath(app_dir)
diff --git a/lib/tapioca/helpers/git_attributes.rb b/lib/tapioca/helpers/git_attributes.rb
index 6db040984..e1594e845 100644
--- a/lib/tapioca/helpers/git_attributes.rb
+++ b/lib/tapioca/helpers/git_attributes.rb
@@ -3,8 +3,6 @@
 
 class GitAttributes
   class << self
-    extend T::Sig
-
     #: (Pathname path) -> void
     def create_generated_attribute_file(path)
       create_gitattributes_file(path, <<~CONTENT)
diff --git a/lib/tapioca/helpers/rbi_files_helper.rb b/lib/tapioca/helpers/rbi_files_helper.rb
index 682cc5f9a..e4bef5ee2 100644
--- a/lib/tapioca/helpers/rbi_files_helper.rb
+++ b/lib/tapioca/helpers/rbi_files_helper.rb
@@ -5,7 +5,6 @@ module Tapioca
   # @requires_ancestor: Thor::Shell
   # @requires_ancestor: SorbetHelper
   module RBIFilesHelper
-    extend T::Sig
     #: (RBI::Index index, String kind, String file) -> void
     def index_rbi(index, kind, file)
       return unless File.exist?(file)
diff --git a/lib/tapioca/helpers/rbi_helper.rb b/lib/tapioca/helpers/rbi_helper.rb
index f695a508c..273e422bd 100644
--- a/lib/tapioca/helpers/rbi_helper.rb
+++ b/lib/tapioca/helpers/rbi_helper.rb
@@ -3,14 +3,11 @@
 
 module Tapioca
   module RBIHelper
-    extend T::Sig
     include SorbetHelper
     extend SorbetHelper
     extend self
 
     class << self
-      extend T::Sig
-
       #: (String type, Symbol variance, String? fixed, String? upper, String? lower) -> String
       def serialize_type_variable(type, variance, fixed, upper, lower)
         variance = nil if variance == :invariant
diff --git a/lib/tapioca/helpers/sorbet_helper.rb b/lib/tapioca/helpers/sorbet_helper.rb
index 3925b3f31..d9156e1b7 100644
--- a/lib/tapioca/helpers/sorbet_helper.rb
+++ b/lib/tapioca/helpers/sorbet_helper.rb
@@ -3,8 +3,6 @@
 
 module Tapioca
   module SorbetHelper
-    extend T::Sig
-
     SORBET_GEM_SPEC = ::Gem::Specification.find_by_name("sorbet-static") #: ::Gem::Specification
 
     SORBET_BIN = Pathname.new(SORBET_GEM_SPEC.full_gem_path) / "libexec" / "sorbet" #: Pathname
diff --git a/lib/tapioca/helpers/source_uri.rb b/lib/tapioca/helpers/source_uri.rb
index 19723ff96..5965ade30 100644
--- a/lib/tapioca/helpers/source_uri.rb
+++ b/lib/tapioca/helpers/source_uri.rb
@@ -5,8 +5,6 @@
 
 module Tapioca
   class SourceURI < URI::File
-    extend T::Sig
-
     COMPONENT = [
       :scheme,
       :gem_name,
@@ -26,8 +24,6 @@ class SourceURI < URI::File
     attr_reader :gem_version
 
     class << self
-      extend T::Sig
-
       #: (gem_name: String, gem_version: String?, path: String, line_number: String?) -> instance
       def build(gem_name:, gem_version:, path:, line_number:)
         super(
diff --git a/lib/tapioca/helpers/test/content.rb b/lib/tapioca/helpers/test/content.rb
index 7fda52880..fee0d0a00 100644
--- a/lib/tapioca/helpers/test/content.rb
+++ b/lib/tapioca/helpers/test/content.rb
@@ -6,7 +6,6 @@ module Helpers
     module Test
       # @requires_ancestor: Kernel
       module Content
-        extend T::Sig
         #: -> void
         def teardown
           super
diff --git a/lib/tapioca/helpers/test/dsl_compiler.rb b/lib/tapioca/helpers/test/dsl_compiler.rb
index edf7b39fd..8274a03dc 100644
--- a/lib/tapioca/helpers/test/dsl_compiler.rb
+++ b/lib/tapioca/helpers/test/dsl_compiler.rb
@@ -12,7 +12,6 @@ module Helpers
     module Test
       # @requires_ancestor: Kernel
       module DslCompiler
-        extend T::Sig
         include Isolation
         include Content
         include Template
@@ -50,8 +49,6 @@ def context
         end
 
         class CompilerContext
-          extend T::Sig
-
           include SorbetHelper
 
           #: singleton(Tapioca::Dsl::Compiler)
diff --git a/lib/tapioca/helpers/test/isolation.rb b/lib/tapioca/helpers/test/isolation.rb
index c6ef08545..6a32946e1 100644
--- a/lib/tapioca/helpers/test/isolation.rb
+++ b/lib/tapioca/helpers/test/isolation.rb
@@ -7,12 +7,9 @@ module Test
       # Copied from ActiveSupport::Testing::Isolation since we cannot require
       # constants from ActiveSupport without polluting the global namespace.
       module Isolation
-        extend T::Sig
         require "thread"
 
         class << self
-          extend T::Sig
-
           #: -> bool
           def forking_env?
             !ENV["NO_FORK"] && Process.respond_to?(:fork)
@@ -30,7 +27,6 @@ def run
 
         # @requires_ancestor: Kernel
         module Forking
-          extend T::Sig
           #: ?{ (?) -> untyped } -> String
           def run_in_isolation(&_blk)
             read, write = IO.pipe
@@ -72,8 +68,6 @@ def run_in_isolation(&_blk)
 
         # @requires_ancestor: Kernel
         module Subprocess
-          extend T::Sig
-
           ORIG_ARGV = ARGV.dup #: Array[String]
 
           # Crazy H4X to get this working in windows / jruby with
diff --git a/lib/tapioca/helpers/test/template.rb b/lib/tapioca/helpers/test/template.rb
index 62ae80f3c..072198a20 100644
--- a/lib/tapioca/helpers/test/template.rb
+++ b/lib/tapioca/helpers/test/template.rb
@@ -6,7 +6,6 @@ module Helpers
     module Test
       # @requires_ancestor: Kernel
       module Template
-        extend T::Sig
         ERB_SUPPORTS_KVARGS = ::ERB.instance_method(:initialize).parameters.assoc(:key) #: [Symbol, Symbol]?
 
         #: (String selector) -> bool
diff --git a/lib/tapioca/loaders/dsl.rb b/lib/tapioca/loaders/dsl.rb
index 5f1e57cee..df363dd5a 100644
--- a/lib/tapioca/loaders/dsl.rb
+++ b/lib/tapioca/loaders/dsl.rb
@@ -4,11 +4,7 @@
 module Tapioca
   module Loaders
     class Dsl < Loader
-      extend T::Sig
-
       class << self
-        extend T::Sig
-
         #: (tapioca_path: String, ?eager_load: bool, ?app_root: String, ?halt_upon_load_error: bool) -> void
         def load_application(
           tapioca_path:,
diff --git a/lib/tapioca/loaders/gem.rb b/lib/tapioca/loaders/gem.rb
index 7dc5d3653..102dcdba0 100644
--- a/lib/tapioca/loaders/gem.rb
+++ b/lib/tapioca/loaders/gem.rb
@@ -4,11 +4,7 @@
 module Tapioca
   module Loaders
     class Gem < Loader
-      extend T::Sig
-
       class << self
-        extend T::Sig
-
         #: (bundle: Gemfile, prerequire: String?, postrequire: String, default_command: String, halt_upon_load_error: bool) -> void
         def load_application(bundle:, prerequire:, postrequire:, default_command:, halt_upon_load_error:)
           loader = new(
diff --git a/lib/tapioca/loaders/loader.rb b/lib/tapioca/loaders/loader.rb
index 00e974908..23a3fa845 100644
--- a/lib/tapioca/loaders/loader.rb
+++ b/lib/tapioca/loaders/loader.rb
@@ -5,7 +5,6 @@ module Tapioca
   module Loaders
     # @abstract
     class Loader
-      extend T::Sig
       include Thor::Base
       include CliHelper
       include Tapioca::GemHelper
diff --git a/lib/tapioca/rbi_ext/model.rb b/lib/tapioca/rbi_ext/model.rb
index 1b69cf21f..ea5844217 100644
--- a/lib/tapioca/rbi_ext/model.rb
+++ b/lib/tapioca/rbi_ext/model.rb
@@ -3,8 +3,6 @@
 
 module RBI
   class Tree
-    extend T::Sig
-
     #: (::Module constant) ?{ (Scope scope) -> void } -> Scope
     def create_path(constant, &block)
       constant_name = Tapioca::Runtime::Reflection.name_of(constant)
diff --git a/lib/tapioca/rbi_formatter.rb b/lib/tapioca/rbi_formatter.rb
index 26fc20ef3..0ae4ccbb8 100644
--- a/lib/tapioca/rbi_formatter.rb
+++ b/lib/tapioca/rbi_formatter.rb
@@ -3,8 +3,6 @@
 
 module Tapioca
   class RBIFormatter < RBI::Formatter
-    extend T::Sig
-
     #: (RBI::File file, String command, ?reason: String?) -> void
     def write_header!(file, command, reason: nil)
       file.comments << RBI::Comment.new("DO NOT EDIT MANUALLY")
diff --git a/lib/tapioca/repo_index.rb b/lib/tapioca/repo_index.rb
index 70e5c9016..cd25f248b 100644
--- a/lib/tapioca/repo_index.rb
+++ b/lib/tapioca/repo_index.rb
@@ -3,10 +3,7 @@
 
 module Tapioca
   class RepoIndex
-    extend T::Sig
     class << self
-      extend T::Sig
-
       #: (String json) -> RepoIndex
       def from_json(json)
         RepoIndex.from_hash(JSON.parse(json))
diff --git a/lib/tapioca/runtime/attached_class_of_32.rb b/lib/tapioca/runtime/attached_class_of_32.rb
index a9a0d349c..7b3df4fc9 100644
--- a/lib/tapioca/runtime/attached_class_of_32.rb
+++ b/lib/tapioca/runtime/attached_class_of_32.rb
@@ -8,8 +8,6 @@ module Runtime
     # added in Ruby 3.2 and fetches the attached object of a singleton
     # class without having to iterate through all of ObjectSpace.
     module AttachedClassOf
-      extend T::Sig
-
       #: (Class singleton_class) -> Module?
       def attached_class_of(singleton_class)
         result = singleton_class.attached_object
diff --git a/lib/tapioca/runtime/attached_class_of_legacy.rb b/lib/tapioca/runtime/attached_class_of_legacy.rb
index f09291a1d..66e4c010a 100644
--- a/lib/tapioca/runtime/attached_class_of_legacy.rb
+++ b/lib/tapioca/runtime/attached_class_of_legacy.rb
@@ -9,7 +9,6 @@ module Runtime
     # class by iterating through ObjectSpace.
     # @requires_ancestor: Tapioca::Runtime::Reflection
     module AttachedClassOf
-      extend T::Sig
       #: (Class singleton_class) -> Module?
       def attached_class_of(singleton_class)
         # https://stackoverflow.com/a/36622320/98634
diff --git a/lib/tapioca/runtime/dynamic_mixin_compiler.rb b/lib/tapioca/runtime/dynamic_mixin_compiler.rb
index 8248c7ee8..299519043 100644
--- a/lib/tapioca/runtime/dynamic_mixin_compiler.rb
+++ b/lib/tapioca/runtime/dynamic_mixin_compiler.rb
@@ -4,7 +4,6 @@
 module Tapioca
   module Runtime
     class DynamicMixinCompiler
-      extend T::Sig
       include Runtime::Reflection
 
       #: Array[Module]
@@ -95,8 +94,6 @@ def method_missing(symbol, *args)
           end
 
           class << self
-            extend T::Sig
-
             T::Sig::WithoutRuntime.sig { params(symbol: Symbol, args: T.untyped).returns(T.untyped) }
             def method_missing(symbol, *args)
               # Similarly, we need this here so that we can handle any
diff --git a/lib/tapioca/runtime/generic_type_registry.rb b/lib/tapioca/runtime/generic_type_registry.rb
index 465585bf9..cc71c2a29 100644
--- a/lib/tapioca/runtime/generic_type_registry.rb
+++ b/lib/tapioca/runtime/generic_type_registry.rb
@@ -26,8 +26,6 @@ module GenericTypeRegistry
       @type_variables = {}.compare_by_identity #: Hash[Module, Array[TypeVariableModule]]
 
       class GenericType < T::Types::Simple
-        extend T::Sig
-
         #: (Module raw_type, Module underlying_type) -> void
         def initialize(raw_type, underlying_type)
           super(raw_type)
@@ -43,8 +41,6 @@ def valid?(obj)
       end
 
       class << self
-        extend T::Sig
-
         # This method is responsible for building the name of the instantiated concrete type
         # and cloning the given constant so that we can return a type that is the same
         # as the current type but is a different instance and has a different name method.
diff --git a/lib/tapioca/runtime/reflection.rb b/lib/tapioca/runtime/reflection.rb
index e2011bd33..15f072514 100644
--- a/lib/tapioca/runtime/reflection.rb
+++ b/lib/tapioca/runtime/reflection.rb
@@ -16,8 +16,6 @@ module Tapioca
   module Runtime
     module Reflection
       include AttachedClassOf
-
-      extend T::Sig
       extend self
 
       CLASS_METHOD = Kernel.instance_method(:class) #: UnboundMethod
diff --git a/lib/tapioca/runtime/trackers.rb b/lib/tapioca/runtime/trackers.rb
index 580f4fbdc..b1e5ea1af 100644
--- a/lib/tapioca/runtime/trackers.rb
+++ b/lib/tapioca/runtime/trackers.rb
@@ -6,13 +6,9 @@
 module Tapioca
   module Runtime
     module Trackers
-      extend T::Sig
-
       @trackers = [] #: Array[Tracker]
 
       class << self
-        extend T::Sig
-
         #: [Return] { -> Return } -> Return
         def with_trackers_enabled(&blk)
           # Currently this is a dirty hack to ensure disabling trackers
diff --git a/lib/tapioca/runtime/trackers/autoload.rb b/lib/tapioca/runtime/trackers/autoload.rb
index 83aa9c7cd..f976e1c2c 100644
--- a/lib/tapioca/runtime/trackers/autoload.rb
+++ b/lib/tapioca/runtime/trackers/autoload.rb
@@ -6,15 +6,12 @@ module Runtime
     module Trackers
       module Autoload
         extend Tracker
-        extend T::Sig
 
         NOOP_METHOD = ->(*_args, **_kwargs, &_block) {}
 
         @constant_names_registered_for_autoload = [] #: Array[String]
 
         class << self
-          extend T::Sig
-
           #: -> void
           def eager_load_all!
             with_disabled_exits do
diff --git a/lib/tapioca/runtime/trackers/constant_definition.rb b/lib/tapioca/runtime/trackers/constant_definition.rb
index dc38e9428..3e00bb41c 100644
--- a/lib/tapioca/runtime/trackers/constant_definition.rb
+++ b/lib/tapioca/runtime/trackers/constant_definition.rb
@@ -11,7 +11,6 @@ module Trackers
       module ConstantDefinition
         extend Tracker
         extend Reflection
-        extend T::Sig
 
         @class_files = {}.compare_by_identity #: Hash[Module, Set[SourceLocation]]
 
diff --git a/lib/tapioca/runtime/trackers/mixin.rb b/lib/tapioca/runtime/trackers/mixin.rb
index 2f1226bc0..f416966fb 100644
--- a/lib/tapioca/runtime/trackers/mixin.rb
+++ b/lib/tapioca/runtime/trackers/mixin.rb
@@ -6,7 +6,6 @@ module Runtime
     module Trackers
       module Mixin
         extend Tracker
-        extend T::Sig
 
         @constants_to_mixin_locations = {}.compare_by_identity
         @mixins_to_constants = {}.compare_by_identity
@@ -20,8 +19,6 @@ class Type < T::Enum
         end
 
         class << self
-          extend T::Sig
-
           #: [Result] { -> Result } -> Result
           def with_disabled_registration(&block)
             with_disabled_tracker(&block)
diff --git a/lib/tapioca/runtime/trackers/required_ancestor.rb b/lib/tapioca/runtime/trackers/required_ancestor.rb
index 636d759a7..4792f2568 100644
--- a/lib/tapioca/runtime/trackers/required_ancestor.rb
+++ b/lib/tapioca/runtime/trackers/required_ancestor.rb
@@ -9,8 +9,6 @@ module RequiredAncestor
         @required_ancestors_map = {}.compare_by_identity
 
         class << self
-          extend T::Sig
-
           #: (T::Helpers requiring, ^-> void block) -> void
           def register(requiring, block)
             return unless enabled?
diff --git a/lib/tapioca/runtime/trackers/tracker.rb b/lib/tapioca/runtime/trackers/tracker.rb
index 6da403b0a..8163c5464 100644
--- a/lib/tapioca/runtime/trackers/tracker.rb
+++ b/lib/tapioca/runtime/trackers/tracker.rb
@@ -6,10 +6,7 @@ module Runtime
     module Trackers
       # @abstract
       module Tracker
-        extend T::Sig
         class << self
-          extend T::Sig
-
           #: ((Tracker & Module) base) -> void
           def extended(base)
             Trackers.register_tracker(base)
diff --git a/lib/tapioca/sorbet_ext/generic_name_patch.rb b/lib/tapioca/sorbet_ext/generic_name_patch.rb
index e5b3291c3..40a1981f7 100644
--- a/lib/tapioca/sorbet_ext/generic_name_patch.rb
+++ b/lib/tapioca/sorbet_ext/generic_name_patch.rb
@@ -120,8 +120,6 @@ def initialize(name, variance)
   # need to do any matching of constants to type variables to bind their names, Ruby will
   # do that automatically for us and we get the `name` method for free from `Module`.
   class TypeVariableModule < Module
-    extend T::Sig
-
     class Type < T::Enum
       enums do
         Member = new("type_member")
diff --git a/lib/tapioca/static/requires_compiler.rb b/lib/tapioca/static/requires_compiler.rb
index 50c0a95e7..5d7849e94 100644
--- a/lib/tapioca/static/requires_compiler.rb
+++ b/lib/tapioca/static/requires_compiler.rb
@@ -4,8 +4,6 @@
 module Tapioca
   module Static
     class RequiresCompiler
-      extend T::Sig
-
       #: (String sorbet_path) -> void
       def initialize(sorbet_path)
         @sorbet_path = sorbet_path
diff --git a/lib/tapioca/static/symbol_loader.rb b/lib/tapioca/static/symbol_loader.rb
index 16b31ccaa..bce33e3e1 100644
--- a/lib/tapioca/static/symbol_loader.rb
+++ b/lib/tapioca/static/symbol_loader.rb
@@ -5,7 +5,6 @@ module Tapioca
   module Static
     module SymbolLoader
       class << self
-        extend T::Sig
         include SorbetHelper
         include Runtime::Reflection
 
diff --git a/lib/tapioca/static/symbol_table_parser.rb b/lib/tapioca/static/symbol_table_parser.rb
index a8f22d815..4600a0638 100644
--- a/lib/tapioca/static/symbol_table_parser.rb
+++ b/lib/tapioca/static/symbol_table_parser.rb
@@ -4,13 +4,9 @@
 module Tapioca
   module Static
     class SymbolTableParser
-      extend T::Sig
-
       SKIP_PARSE_KINDS = ["CLASS_OR_MODULE", "STATIC_FIELD"].freeze #: Array[String]
 
       class << self
-        extend T::Sig
-
         #: (String json_string) -> Set[String]
         def parse_json(json_string)
           obj = JSON.parse(json_string)
diff --git a/spec/dsl_spec_helper.rb b/spec/dsl_spec_helper.rb
index 091775312..02f3cda67 100644
--- a/spec/dsl_spec_helper.rb
+++ b/spec/dsl_spec_helper.rb
@@ -6,12 +6,9 @@
 require "tapioca/helpers/test/dsl_compiler"
 
 class DslSpec < Minitest::Spec
-  extend T::Sig
   include Tapioca::Helpers::Test::DslCompiler
 
   class << self
-    extend T::Sig
-
     #: -> singleton(DslSpec)
     def spec_test_class
       # It should be the one that directly inherits from DslSpec
diff --git a/spec/helpers/mock_gem.rb b/spec/helpers/mock_gem.rb
index 88d35e581..e47b3bce9 100644
--- a/spec/helpers/mock_gem.rb
+++ b/spec/helpers/mock_gem.rb
@@ -4,8 +4,6 @@
 module Tapioca
   # A mock gem used for testing purposes
   class MockGem < Spoom::Context
-    extend T::Sig
-
     # The gem's name
     #: String
     attr_reader :name
diff --git a/spec/helpers/mock_project.rb b/spec/helpers/mock_project.rb
index 31afa8ec9..72c4f8703 100644
--- a/spec/helpers/mock_project.rb
+++ b/spec/helpers/mock_project.rb
@@ -7,8 +7,6 @@
 module Tapioca
   # A mock project used for testing purposes
   class MockProject < Spoom::Context
-    extend T::Sig
-
     # Path to Tapioca's source files
     TAPIOCA_PATH = (Pathname.new(__FILE__) / ".." / ".." / "..").to_s #: String
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d781ce4c0..215c01eab 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -25,7 +25,6 @@
 
 module Minitest
   class Test
-    extend T::Sig
     extend Rails::LineFiltering
   end
 end
diff --git a/spec/spec_with_project.rb b/spec/spec_with_project.rb
index 9b2b6d118..164b74183 100644
--- a/spec/spec_with_project.rb
+++ b/spec/spec_with_project.rb
@@ -5,8 +5,6 @@
 
 module Tapioca
   class SpecWithProject < Minitest::HooksSpec
-    extend T::Sig
-
     TEST_TMP_PATH = "/tmp/tapioca/tests"
 
     # Spec lifecycle
@@ -168,8 +166,6 @@ def assert_stderr_equals(text, result)
       @assertion_updates = {} #: Hash[String, Array[[Integer, Symbol, String]]]
 
       class << self
-        extend T::Sig
-
         #: Hash[String, Array[[Integer, Symbol, String]]]
         attr_reader :assertion_updates
 
diff --git a/spec/tapioca/dsl/helpers/active_model_type_helper_spec.rb b/spec/tapioca/dsl/helpers/active_model_type_helper_spec.rb
index b0f9fb926..832e8bd6a 100644
--- a/spec/tapioca/dsl/helpers/active_model_type_helper_spec.rb
+++ b/spec/tapioca/dsl/helpers/active_model_type_helper_spec.rb
@@ -16,7 +16,6 @@ class ValueType
         end
 
         class CustomWithTypeVariable < ActiveModel::Type::Value
-          extend T::Sig
           extend T::Generic
 
           Elem = type_member
@@ -30,8 +29,6 @@ def cast(value)
         describe "type_for" do
           it "discovers custom type from __tapioca_type method" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: -> untyped
               def __tapioca_type
                 T.any(Integer, String)
@@ -67,8 +64,6 @@ def cast_value(value)
 
           it "discovers custom type from signature on deserialize method" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> String
               def cast(value)
                 super
@@ -99,8 +94,6 @@ def cast_value(value)
 
           it "discovers custom type from signature on cast method" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> String
               def cast(value)
                 super
@@ -131,8 +124,6 @@ def cast_value(value)
 
           it "discovers custom type from signature on cast_value method" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> untyped
               def cast(value)
                 super
@@ -163,8 +154,6 @@ def cast_value(value)
 
           it "discovers custom type from signature on serialize method" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> untyped
               def cast(value)
                 super
@@ -195,8 +184,6 @@ def cast_value(value)
 
           it "discovers custom type even if it is not ActiveModel::Type::Value" do
             klass = Class.new do
-              extend T::Sig
-
               #: (untyped value) -> Integer
               def cast(value)
               end
@@ -210,8 +197,6 @@ def cast(value)
 
           it "discovers custom type even if it is generic" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> ValueType[Integer]
               def cast(value)
               end
@@ -230,10 +215,8 @@ def cast(value)
             )
           end
 
-          it "returns a weak type if custom type cannot be discovered from signatures" do
+          it "returns a weak type if custom type cannot be discovered from signatures" do # rubocop:disable RSpec/RepeatedExample
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: (untyped value) -> untyped
               def cast(value)
                 super
@@ -261,7 +244,7 @@ def cast_value(value)
             )
           end
 
-          it "returns a weak type if custom type does not have any signatures" do
+          it "returns a weak type if custom type does not have any signatures" do # rubocop:disable RSpec/RepeatedExample
             klass = Class.new(ActiveModel::Type::Value) do
               def cast(value)
                 super
@@ -308,8 +291,6 @@ def cast_value(value)
 
           it "does not assume the type is nilable when `#__tapioca_type` is defined" do
             klass = Class.new(ActiveModel::Type::Value) do
-              extend T::Sig
-
               #: -> Module
               def __tapioca_type = String
             end
diff --git a/spec/tapioca/dsl/helpers/graphql_type_helper_spec.rb b/spec/tapioca/dsl/helpers/graphql_type_helper_spec.rb
index 9587e4dd9..c8b19583e 100644
--- a/spec/tapioca/dsl/helpers/graphql_type_helper_spec.rb
+++ b/spec/tapioca/dsl/helpers/graphql_type_helper_spec.rb
@@ -8,8 +8,6 @@ module Tapioca
   module Dsl
     module Helpers
       class GraphqlTypeHelperSpec < Minitest::Spec
-        extend T::Sig
-
         #: -> void
         def before_setup
           require "graphql"
diff --git a/spec/tapioca/gemfile_spec.rb b/spec/tapioca/gemfile_spec.rb
index de419e1f9..1e6882a3a 100644
--- a/spec/tapioca/gemfile_spec.rb
+++ b/spec/tapioca/gemfile_spec.rb
@@ -5,8 +5,6 @@
 
 module Tapioca
   class GemfileSpec < SpecWithProject
-    extend T::Sig
-
     describe Tapioca::Gemfile do
       it "export_rbi_files? returns false if the gem does not export RBI files" do
         foo_gem = mock_gem("foo", "0.0.1")
diff --git a/spec/tapioca/runtime/reflection_spec.rb b/spec/tapioca/runtime/reflection_spec.rb
index 0b087d72f..95edd51c3 100644
--- a/spec/tapioca/runtime/reflection_spec.rb
+++ b/spec/tapioca/runtime/reflection_spec.rb
@@ -62,8 +62,6 @@ def equal?(other)
     end
 
     class SignatureFoo
-      extend T::Sig
-
       #: -> String
       def good_method
         "Thank you."