diff --git a/src/api.js b/src/api.ts
similarity index 100%
rename from src/api.js
rename to src/api.ts
diff --git a/src/language.js b/src/language.ts
similarity index 100%
rename from src/language.js
rename to src/language.ts
diff --git a/src/markdown.js b/src/markdown.ts
similarity index 100%
rename from src/markdown.js
rename to src/markdown.ts
diff --git a/src/transformer.js b/src/transformer.ts
similarity index 100%
rename from src/transformer.js
rename to src/transformer.ts
diff --git a/src/url.js b/src/url.ts
similarity index 100%
rename from src/url.js
rename to src/url.ts
diff --git a/vite.config.ts b/vite.config.ts
index 723d56e..57ec81b 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -21,7 +21,7 @@ export default defineConfig({
 
         coverage: {
             provider: 'istanbul',
-            include: ['src/**/*.js'],
+            include: ['src/**/*.ts'],
             reporter: ['html', 'text-summary', 'json'],
             reportsDirectory: './test-coverage',
         },