Flutter – How to execute method which comes from package specified only for one platform (WEB)

I have one code for mobile and web app in Flutter. Only difference is using another method for navigation back (because some issue in flutter web).

1. For web: js.context.callMethod(‘back’)
2. For mobile: Navigator.pop(context);

import 'package:flutter/material.dart';
import 'dart:js' as js;  ///this is only for web

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home:  HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({super.key});

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text("Homepage"),
      ),
      body: Container(),


      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => SecondPage()),
          );
        },
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text("Second page"),
      ),
      body: Container(),


      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.pop(context);  ///   for mobile
          js.context.callMethod('back');   /// for web
        },
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

}

I can’t build app for mobile using ‘dart:js’ and having method js.context.callMethod(‘back’) in code. Even if I have condition for platform.

What is good approach to do it?