diff --git a/src/index.js b/src/index.ts
similarity index 59%
rename from src/index.js
rename to src/index.ts
index 0b4e54b..fbff1ff 100644
--- a/src/index.js
+++ b/src/index.ts
@@ -1,13 +1,15 @@
+import { Language } from './language/language';
+
 import { IntentsBuilder } from './intents';
 import { ActionsBuilder } from './actions';
 
 export * from './intents';
 export * from './actions';
 
-export function intentsBuilder(lang) {
+export function intentsBuilder(lang: Language) {
 	return new IntentsBuilder(lang);
 }
 
-export function actionsBuilder(lang) {
+export function actionsBuilder(lang: Language) {
 	return new ActionsBuilder(lang);
 }