diff --git a/src/App.vue b/src/App.vue
index a9e451f..4824c26 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -15,7 +15,7 @@ limitations under the License.
 -->
 
 <script setup>
-import { LANGUAGE_PATH } from './config/featureSettings.js';
+import { LANGUAGE_PATH } from './config/featureSettings';
 import AppFooter from './features/footer/components/AppFooter.vue';
 import AppNavbar from './features/nav/components/AppNavbar.vue';
 import { useSettings } from './features/settings/composables/useSettings.js';
diff --git a/src/config/env.js b/src/config/env.ts
similarity index 91%
rename from src/config/env.js
rename to src/config/env.ts
index 46d15dc..4498b77 100644
--- a/src/config/env.js
+++ b/src/config/env.ts
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-export const getAssetsUrl = function getAssetsUrl() {
+export const getAssetsUrl = function getAssetsUrl(): string {
     return new URL(
         `${import.meta.env.VITE_ASSETS_BUILD_ID}/`,
         import.meta.env.VITE_ASSETS_BASE_URL,
diff --git a/src/config/featureSettings.js b/src/config/featureSettings.ts
similarity index 100%
rename from src/config/featureSettings.js
rename to src/config/featureSettings.ts
diff --git a/src/features/i18n/components/__tests__/LanguageSwitchButton.test.js b/src/features/i18n/components/__tests__/LanguageSwitchButton.test.js
index 7c3e3c3..3f0d160 100644
--- a/src/features/i18n/components/__tests__/LanguageSwitchButton.test.js
+++ b/src/features/i18n/components/__tests__/LanguageSwitchButton.test.js
@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import LanguageSwitchButton from '../LanguageSwitchButton.vue';
-import { LANGUAGE_PATH } from '@/config/featureSettings.js';
+import { LANGUAGE_PATH } from '@/config/featureSettings';
 import { useSettings } from '@/features/settings/composables/useSettings.js';
 import { mountComponent } from '@/test-utils/mountComponent.js';
 import { describe, expect, test } from 'vitest';