diff --git a/Library/Homebrew/bundle/mac_app_store_dumper.rb b/Library/Homebrew/bundle/mac_app_store_dumper.rb
index 390b10d386..1c2d228e65 100644
--- a/Library/Homebrew/bundle/mac_app_store_dumper.rb
+++ b/Library/Homebrew/bundle/mac_app_store_dumper.rb
@@ -1,4 +1,4 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 require "json"
@@ -6,11 +6,14 @@ require "json"
 module Homebrew
   module Bundle
     module MacAppStoreDumper
+      sig { void }
       def self.reset!
         @apps = nil
       end
 
+      sig { returns(T::Array[[String, String]]) }
       def self.apps
+        @apps ||= T.let(nil, T.nilable(T::Array[[String, String]]))
         @apps ||= if Bundle.mas_installed?
           `mas list 2>/dev/null`.split("\n").map do |app|
             app_details = app.match(/\A(?<id>\d+)\s+(?<name>.*?)\s+\((?<version>[\d.]*)\)\Z/)
@@ -19,7 +22,7 @@ module Homebrew
             # Strip unprintable characters
             if app_details
               name = T.must(app_details[:name])
-              [app_details[:id], name.gsub(/[[:cntrl:]]|[\p{C}]/, "")]
+              [T.must(app_details[:id]), name.gsub(/[[:cntrl:]]|[\p{C}]/, "")]
             end
           end
         else
@@ -27,10 +30,12 @@ module Homebrew
         end.compact
       end
 
+      sig { returns(T::Array[Integer]) }
       def self.app_ids
         apps.map { |id, _| id.to_i }
       end
 
+      sig { returns(String) }
       def self.dump
         apps.sort_by { |_, name| name.downcase }.map { |id, name| "mas \"#{name}\", id: #{id}" }.join("\n")
       end