diff --git a/Library/Homebrew/cli/args.rb b/Library/Homebrew/cli/args.rb
index ba341a36f1..49a9940541 100644
--- a/Library/Homebrew/cli/args.rb
+++ b/Library/Homebrew/cli/args.rb
@@ -68,7 +68,7 @@ module Homebrew
 
       def build_from_source_formulae
         if build_from_source? || self[:HEAD?] || self[:build_bottle?]
-          named.to_formulae_and_casks.select { |f| f.is_a?(Formula) }.map(&:full_name)
+          named.to_formulae.map(&:full_name)
         else
           []
         end
diff --git a/Library/Homebrew/cmd/home.rb b/Library/Homebrew/cmd/home.rb
index 125aeb8ff1..649c3d09da 100644
--- a/Library/Homebrew/cmd/home.rb
+++ b/Library/Homebrew/cmd/home.rb
@@ -36,7 +36,9 @@ module Homebrew
       return
     end
 
-    homepages = args.named.to_formulae_and_casks.map do |formula_or_cask|
+    # to_formulae_and_casks is typed to possibly return Kegs (but won't without explicitly asking)
+    formulae_or_casks = T.cast(args.named.to_formulae_and_casks, T::Array[T.any(Formula, Cask::Cask)])
+    homepages = formulae_or_casks.map do |formula_or_cask|
       puts "Opening homepage for #{name_of(formula_or_cask)}"
       formula_or_cask.homepage
     end
diff --git a/Library/Homebrew/sorbet/parlour.rb b/Library/Homebrew/sorbet/parlour.rb
index c33a64dc8c..102df89819 100644
--- a/Library/Homebrew/sorbet/parlour.rb
+++ b/Library/Homebrew/sorbet/parlour.rb
@@ -1,5 +1,5 @@
-# frozen_string_literal: true
 # typed: true
+# frozen_string_literal: true
 
 require_relative "../warnings"
 Warnings.ignore :parser_syntax do
@@ -7,19 +7,21 @@ Warnings.ignore :parser_syntax do
 end
 
 module Homebrew
+  # Parlour type signature generator helper class for Homebrew.
   module Parlour
     extend T::Sig
 
-    ROOT_DIR = T.let(Pathname(__dir__).parent.realpath.freeze, Pathname)
+    ROOT_DIR = T.let(Pathname(__dir__).parent.realpath.freeze, Pathname).freeze
 
     sig { returns(T::Array[Parser::AST::Node]) }
     def self.ast_list
-      @@ast_list ||= begin
+      @ast_list ||= begin
         ast_list = []
         parser = Parser::CurrentRuby.new
+        prune_dirs = %w[sorbet shims test vendor].freeze
 
         ROOT_DIR.find do |path|
-          Find.prune if path.directory? && %w[sorbet shims test vendor].any? { |subdir| path == ROOT_DIR/subdir }
+          Find.prune if path.directory? && prune_dirs.any? { |subdir| path == ROOT_DIR/subdir }
 
           Find.prune if path.file? && path.extname != ".rb"
 
diff --git a/Library/Homebrew/sorbet/parlour/attr.rb b/Library/Homebrew/sorbet/parlour/attr.rb
index 8f8c4bf8fd..20be56b7c5 100644
--- a/Library/Homebrew/sorbet/parlour/attr.rb
+++ b/Library/Homebrew/sorbet/parlour/attr.rb
@@ -1,6 +1,7 @@
-# frozen_string_literal: true
 # typed: strict
+# frozen_string_literal: true
 
+# Parlour type signature generator plugin for Homebrew DSL attributes.
 class Attr < Parlour::Plugin
   sig { override.params(root: Parlour::RbiGenerator::Namespace).void }
   def generate(root)
@@ -13,7 +14,7 @@ class Attr < Parlour::Plugin
 
   sig { override.returns(T.nilable(String)) }
   def strictness
-    return "strict"
+    "strict"
   end
 
   private
@@ -32,7 +33,7 @@ class Attr < Parlour::Plugin
 
     traverse_module_name(node).join("::")
   end
-    
+
   sig { params(node: Parser::AST::Node).returns(T::Array[T.untyped]) }
   def find_custom_attr(node)
     tree = T.let([], T::Array[T.untyped])
@@ -46,15 +47,16 @@ class Attr < Parlour::Plugin
     elsif node.type == :sclass
       subtree = find_custom_attr(node.children[1])
       return tree if subtree.empty?
-      
+
       tree << [:sclass, subtree]
     elsif node.type == :class || node.type == :module
       element = []
-      if node.type == :class
+      case node.type
+      when :class
         element << :class
         element << extract_module_name(children.shift)
         element << extract_module_name(children.shift)
-      elsif node.type == :module
+      when :module
         element << :module
         element << extract_module_name(children.shift)
       end
@@ -69,7 +71,7 @@ class Attr < Parlour::Plugin
       tree << element
     elsif node.type == :send && children.shift.nil?
       method_name = children.shift
-      if method_name == :attr_rw || method_name == :attr_predicate
+      if [:attr_rw, :attr_predicate].include?(method_name)
         children.each do |name_node|
           tree << [method_name, name_node.children.first.to_s]
         end
@@ -96,7 +98,7 @@ class Attr < Parlour::Plugin
         name = node.shift
         name = "self.#{name}" if sclass
         namespace.create_method(name, parameters: [
-          Parlour::RbiGenerator::Parameter.new("arg", type: "T.untyped", default: "T.unsafe(nil)")
+          Parlour::RbiGenerator::Parameter.new("arg", type: "T.untyped", default: "T.unsafe(nil)"),
         ], return_type: "T.untyped")
       when :attr_predicate
         name = node.shift
diff --git a/Library/Homebrew/version.rb b/Library/Homebrew/version.rb
index bab7e36e69..9ab1b12f55 100644
--- a/Library/Homebrew/version.rb
+++ b/Library/Homebrew/version.rb
@@ -39,6 +39,7 @@ class Version
       when /\A#{PostToken::PATTERN}\z/o    then PostToken
       when /\A#{NumericToken::PATTERN}\z/o then NumericToken
       when /\A#{StringToken::PATTERN}\z/o  then StringToken
+      else raise "Cannot find a matching token pattern"
       end.new(val)
     end
 
diff --git a/Library/Homebrew/yard/ignore_directives.rbi b/Library/Homebrew/yard/ignore_directives.rbi
new file mode 100644
index 0000000000..caf505de9c
--- /dev/null
+++ b/Library/Homebrew/yard/ignore_directives.rbi
@@ -0,0 +1,6 @@
+# typed: strict
+
+module YARD
+  class Docstring; end
+  class DocstringParser; end
+end