chore: rename vite.config.js to *.mjs

packages/signature-v4a/vitest.config.mts

@@ -0,0 +1,9 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    exclude: ["**/node_modules/**", "**/es/**"],
+    include: ["**/*.spec.ts"],
+    environment: "node",
+  },
+});

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PackageJsonGenerator.java

@@ -32,7 +32,7 @@ final class PackageJsonGenerator {
 
     public static final String PACKAGE_JSON_FILENAME = "package.json";
     public static final String TYPEDOC_FILE_NAME = "typedoc.json";
-    public static final String VITEST_CONFIG_FILENAME = "vite.config.js";
+    public static final String VITEST_CONFIG_FILENAME = "vite.config.mjs";
 
     private PackageJsonGenerator() {}
 
@@ -67,7 +67,7 @@ static void writePackageJson(
             node = node.withMember(depEntry.getKey(), builder.build());
         }
 
-        // Add test script and vite.config.js if specs and their devDependency on vitest has been generated.
+        // Add test script and vite.config.mjs if specs and their devDependency on vitest has been generated.
         ObjectNode devDeps = node.getObjectMember("devDependencies").orElse(Node.objectNode());
         if (devDeps.containsMember(TypeScriptDependency.VITEST.packageName)) {
             ObjectNode scripts = node.getObjectMember("scripts").orElse(Node.objectNode());