how to remove “uncheck” on cs target?
there is nothing about this
Why do you want to do that? There is a good chance it’s there so that the code actually compiles.
If you want to have cleaner code, especially if using it in a c# project you can add @:nativeGen to your classes, it should remove it.
See Haxe/C# Metadata - Haxe - The Cross-platform Toolkit for more details.