Convert from Webpack to Vite (#34450)

Co-authored-by: Renaud Chaput <renchap@gmail.com>

lib/premailer_bundled_asset_strategy.rb

@@ -2,21 +2,26 @@
 
 module PremailerBundledAssetStrategy
   def load(url)
-    asset_host = ENV['CDN_HOST'] || ENV['WEB_DOMAIN'] || ENV.fetch('LOCAL_DOMAIN', nil)
+    if ViteRuby.instance.dev_server_running?
+      # Request from the dev server
+      return unless url.start_with?("/#{ViteRuby.config.public_output_dir}/")
 
-    if Webpacker.dev_server.running?
-      asset_host = "#{Webpacker.dev_server.protocol}://#{Webpacker.dev_server.host_with_port}"
-      url        = File.join(asset_host, url)
+      headers = {}
+      # Vite dev server wants this header for CSS files, otherwise it will respond with a JS file that inserts the CSS (to support hot reloading)
+      headers['Accept'] = 'text/css' if url.end_with?('.scss', '.css')
+
+      Net::HTTP.get(
+        URI("#{ViteRuby.config.origin}#{url}"),
+        headers
+      ).presence
+    else
+      path = Rails.public_path.join(url.delete_prefix('/'))
+      return unless path.exist?
+
+      path.read
     end
-
-    css = if url.start_with?('http')
-            HTTP.get(url).to_s
-          else
-            url = url[1..] if url.start_with?('/')
-            Rails.public_path.join(url).read
-          end
-
-    css.gsub(%r{url\(/}, "url(#{asset_host}/")
+  rescue ViteRuby::MissingEntrypointError
+    # If the path is not in the manifest, ignore it
   end
 
   module_function :load