Merge pull request rails#47374 from skipkayhil/add-guide-vendoring-script

Add rake task to vendor guide javascript

Author: zzak

guides/Rakefile

@@ -30,6 +30,19 @@ namespace :guides do
     ruby "w3c_validator.rb"
   end
 
+  task :vendor_javascript do
+    module Importmap; end
+    require "importmap/packager"
+
+    packager = Importmap::Packager.new(vendor_path: "assets/javascripts")
+    imports = packager.import("@hotwired/turbo", from: "unpkg")
+    imports.each do |package, url|
+      umd_url = url.gsub("esm.js", "umd.js")
+      puts %(Vendoring "#{package}" to #{packager.vendor_path}/#{package}.js via download from #{umd_url})
+      packager.download(package, umd_url)
+    end
+  end
+
   desc "Show help"
   task :help do
     puts <<HELP