Solid's reactivity.
Flutter's engine.

import { createSignal } from "solid-js";

export default function App() {
  const [count, setCount] = createSignal(0);

  return (
    <view flex={{ align: "center", justify: "center", expand: true }}>
      <text fontSize={48} fontWeight="bold">
        {count()}
      </text>
      <gestureDetector onTap={() => setCount(c => c + 1)} />
    </view>
  );
}

import 'package:flutter/material.dart';
import 'package:solid_fuse/solid_fuse.dart';
import '_generated/fuse_packages.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  final runtime = await FuseRuntime.create();
  registerFusePackages(runtime);

  runApp(MaterialApp(
    home: FuseView(runtime: runtime),
  ));
}