Use best guess for spotlight-frontend package

lib/generators/spotlight/assets/generator_common_utilities.rb

@@ -4,17 +4,25 @@ module Spotlight
   module Assets
     # Utilities for the Spotlight assets generators
     module GeneratorCommonUtilities
-      # Some versions of the blacklight gem do not have a corresponding blacklight-frontend package on npm.
+      # Some versions of the blacklight/spotlight gem do not have a corresponding package on npm.
       # Assume we want the most recent version that is compatible with the major version of the gem.
-      def blacklight_yarn_version
-        versions = JSON.parse(`yarn info blacklight-frontend versions --json`)['data']
-        exact_match = versions.find { |v| v == Blacklight::VERSION }
+      def package_yarn_version(package_name, requested_version)
+        versions = JSON.parse(`yarn info #{package_name} versions --json`)['data']
+        exact_match = versions.find { |v| v == requested_version }
         return exact_match if exact_match
 
-        major_version = Gem::Version.new(Blacklight::VERSION).segments.first
+        major_version = Gem::Version.new(requested_version).segments.first
         "^#{major_version}"
       end
 
+      def blacklight_yarn_version
+        package_yarn_version('blacklight-frontend', Blacklight::VERSION)
+      end
+
+      def spotlight_yarn_version
+        package_yarn_version('spotlight-frontend', Spotlight::VERSION)
+      end
+
       # Support the gem version format e.g.,  `~> 5.3` for consistency.
       def bootstrap_yarn_version
         options[:'bootstrap-version'].match(/(\d+(\.\d+)*)/)[0]

lib/generators/spotlight/assets/importmap_generator.rb

@@ -67,7 +67,7 @@ def add_frontend
         # Otherwise, pick the version from npm that matches the Spotlight
         # gem version
         else
-          run "yarn add spotlight-frontend@#{Spotlight::VERSION}"
+          run "yarn add spotlight-frontend@#{spotlight_yarn_version}"
         end
       end
 

lib/generators/spotlight/assets/propshaft_generator.rb

@@ -63,7 +63,7 @@ def add_frontend
         # Otherwise, pick the version from npm that matches the Spotlight
         # gem version
         else
-          run "yarn add spotlight-frontend@#{Spotlight::VERSION}"
+          run "yarn add spotlight-frontend@#{spotlight_yarn_version}"
         end
       end