replace npmignore with files property

Author: sertonix

.npmignore

@@ -20,5 +20,8 @@
     "devDependencies": {
         "rimraf": "^3.0.2",
         "typescript": "^4.9.4"
-    }
+    },
+    "files": [
+        "build/**/*"
+    ]
 }