Allow loading webpack.config.ts if present

lib/shakapacker/runner.rb

@@ -15,19 +15,28 @@ def initialize(argv)
       @argv = argv
 
       @app_path              = File.expand_path(".", Dir.pwd)
-      @webpack_config        = File.join(@app_path, "config/webpack/webpack.config.js")
       @shakapacker_config    = ENV["SHAKAPACKER_CONFIG"] || File.join(@app_path, "config/shakapacker.yml")
-
-      unless File.exist?(@webpack_config)
-        $stderr.puts "webpack config #{@webpack_config} not found, please run 'bundle exec rails shakapacker:install' to install Shakapacker with default configs or add the missing config file for your custom environment."
-        exit!
-      end
+      @webpack_config        = find_webpack_config
 
       Shakapacker::Utils::Manager.error_unless_package_manager_is_obvious!
     end
 
     def package_json
       @package_json ||= PackageJson.read(@app_path)
     end
+
+    private
+
+    def find_webpack_config
+      possible_paths = %w[ts js].map do |ext|
+        File.join(@app_path, "config/webpack/webpack.config.#{ext}")
+      end
+      path = possible_paths.select { |f| File.exist?(f) }.first
+      unless path
+        $stderr.puts "webpack config #{possible_paths.last} not found, please run 'bundle exec rails shakapacker:install' to install Shakapacker with default configs or add the missing config file for your custom environment."
+        exit!
+      end
+      path
+    end
   end
 end

spec/shakapacker/webpack_runner_spec.rb

@@ -54,6 +54,17 @@
 
         verify_command(cmd, argv: (["--watch"]))
       end
+
+      it "loads webpack.config.ts if present" do
+        ts_config = "#{test_app_path}/config/webpack/webpack.config.ts"
+        FileUtils.touch(ts_config)
+
+        cmd = package_json.manager.native_exec_command("webpack", ["--config", ts_config])
+
+        verify_command(cmd)
+      ensure
+        FileUtils.rm(ts_config)
+      end
     end
   end