fix: types

package.json

@@ -3,6 +3,7 @@
   "version": "0.1.5",
   "description": "The string interpolation utility for JavaScript",
   "type": "module",
+  "types": "./src/index.d.ts",
   "module": "./src/index.js",
   "main": "./dist/cjs/index.cjs",
   "exports": {