Detect every name Vite resolves its config from

CHANGELOG.md

@@ -1,6 +1,12 @@
 main
 ------
 
+* Recognise an application as Vite-based from any of the six names Vite
+  resolves its configuration from, rather than only `vite.config.js`,
+  `vite.config.mjs` and `vite.config.ts`. An application configured in
+  `vite.config.mts`, `vite.config.cts` or `vite.config.cjs` was taken for a
+  classic one and served with `ember build --watch`, which a Vite-based
+  project rejects
 * Report the whole `ember build` failure in the `EmberCli::BuildError`
   message, instead of only its first line. The line naming the file that
   failed to build is rarely the first one the build tool writes, so a parse

lib/ember_cli/path_set.rb

@@ -4,6 +4,17 @@ module EmberCli
   class PathSet
     PACKAGE_MANAGERS = %i[npm yarn pnpm].freeze
 
+    # Every name Vite resolves its configuration file from. An application
+    # that keeps its configuration under any of them is Vite-based.
+    VITE_CONFIG_FILES = %w[
+      vite.config.js
+      vite.config.mjs
+      vite.config.cjs
+      vite.config.ts
+      vite.config.mts
+      vite.config.cts
+    ].freeze
+
     # npm ships with NodeJS, so it has no installation instructions of its own
     # to point at when its executable is missing.
     INSTALL_INSTRUCTIONS = {
@@ -55,8 +66,7 @@ def bower_json
     # Apps generated with the Vite-based blueprint (`ember-cli >= 6.8`)
     # ship a Vite config file at their root.
     def vite?
-      %w[vite.config.mjs vite.config.js vite.config.ts].
-        any? { |config| root.join(config).exist? }
+      VITE_CONFIG_FILES.any? { |config| root.join(config).exist? }
     end
 
     def ember

spec/lib/ember_cli/path_set_spec.rb

@@ -162,20 +162,14 @@
       expect(path_set).not_to be_vite
     end
 
-    it "is true when the app has a vite.config.mjs" do
-      app = build_app
-      create_file(app_root_for(app).join("vite.config.mjs"))
-      path_set = build_path_set(app: app)
-
-      expect(path_set).to be_vite
-    end
-
-    it "is true when the app has a vite.config.js" do
-      app = build_app
-      create_file(app_root_for(app).join("vite.config.js"))
-      path_set = build_path_set(app: app)
+    EmberCli::PathSet::VITE_CONFIG_FILES.each do |config_file|
+      it "is true when the app has a #{config_file}" do
+        app = build_app
+        create_file(app_root_for(app).join(config_file))
+        path_set = build_path_set(app: app)
 
-      expect(path_set).to be_vite
+        expect(path_set).to be_vite
+      end
     end
   end