如何在flutter web中打开wxminiProgram？

dependencies:
  js: ^0.6.1

import 'package:js/js.dart';

@JS('wx.miniProgram.navigateTo')
external void navigateToMiniProgram(String appId, String path);

void openMiniProgram() {
  navigateToMiniProgram('your_app_id', 'your_path');
}

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Open Mini Program'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Open Mini Program'),
            onPressed: openMiniProgram,
          ),
        ),
      ),
    );
  }
}