[Flutter] How to add conditional imports across Flutter mobile,web and window?

I have flutter application which uses different webview plugin for each platform(mobile, web, window).
Though I am able to import platform base on web and mobile, I am not able to import for windows.

I have tried adding else condition if it is not mobile or web, but it is taking mobile plugin.

1. This is how I import package for web and mobile (Working).

import 'package:eam_flutter/form/mobileui.dart'
if (dart.library.html) 'package:eam_flutter/form/webui.dart'
as multiPlatform;

1. This is how I import package for web, mobile and windows (Not Working, it is showing mobile webview exception since it doesn't support desktop).

import 'package:eam_flutter/form/windowui.dart'
if (dart.library.html) 'package:eam_flutter/form/webui.dart'
if (dart.library.io) 'package:eam_flutter/form/mobileui.dart'
as multiPlatform;


How can I specify conditional imports for windows?

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