isWeb property
      
      bool
      get
      isWeb
      
    
    
Whether or not we are running on web.
By default this is the same as kIsWeb.
debugIsWebOverride may be used to override the natural value of isWeb.
Implementation
static bool get isWeb => debugIsWebOverride == null //
    ? kIsWeb
    : debugIsWebOverride == WebPlatformOverride.web;