fix: set module.exports = Slider for Node ESM-for-CJS default-import

src/index.js

@@ -1,3 +1,23 @@
+// Expose Slider as the CJS `module.exports` directly so the compiled entry
+// works under both of the default-import conventions that bundlers use for
+// CJS modules:
+//
+// - The Babel-interop path used by Rollup, webpack < 5, Vite 7, and bundlers
+//   that honor `__esModule: true`: reads `exports.default`, which we still
+//   set via the explicit `.default` assignment below.
+// - The Node ESM-for-CJS path used by Vite 8 (rolldown), webpack 5, and Node
+//   itself when the consumer package has `"type": "module"`: reads
+//   `module.exports`, which is the Slider class itself — *not* a
+//   `{default: Slider, __esModule: true}` namespace object.
+//
+// Without the `module.exports = Slider` line, the compiled lib/index.js emits
+// `exports.default = Slider; exports.__esModule = true;` and leaves
+// `module.exports` as the full `exports` object, so consumers on the Node
+// ESM-for-CJS path receive that namespace and `<Slider />` crashes with
+// `Element type is invalid: ... got: object` (React error #130).
+// See https://github.com/rolldown/rolldown/issues/8061.
+
 import Slider from "./slider";
 
-export default Slider;
+module.exports = Slider;
+module.exports.default = Slider;