How to detect if flutter app is running in web

kIsWeb.dart

import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

const BE_HOST = 'https://api.dev';

class AppConfig {
  static String BE_ENDPOINT;
}

void main() {
  if (kIsWeb) {
    AppConfig.BE_ENDPOINT = '$BE_HOST/web/';
  } else if (Platform.isAndroid) {
    AppConfig.BE_ENDPOINT = '$BE_HOST/android/';
  }

  runApp(App());
}

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Text(AppConfig.BE_ENDPOINT),
        ),
      ),
    );
  }
}