ci: exposes type definitions (#24)

Author: micheleriva

package.json

@@ -12,6 +12,7 @@
     ".": {
       "require": "./dist/index.cjs.js",
       "import": "./dist/index.esm.js",
+      "types": "./dist/index.d.ts",
       "default": "./dist/airbyte-embedded-widget.iife.js"
     }
   },
@@ -24,7 +25,7 @@
   "scripts": {
     "test": "jest",
     "clean": "rm -rf dist",
-    "build": "rollup -c",
+    "build": "rollup -c && tsc --declaration --emitDeclarationOnly --declarationDir dist",
     "prepare": "pnpm run clean && pnpm run build"
   },
   "keywords": [