Write UI in C#. Ship JavaScript.

using eQuantic.UI.Core;
using eQuantic.UI.Components;

[Page("/counter")]
public class Counter : StatefulComponent
{
    [ServerAction]
    public async Task<int> IncrementOnServer(int value)
    {
        return value + 1;
    }

    public override ComponentState CreateState() => new CounterState();
}

public class CounterState : ComponentState<Counter>
{
    private int _count = 0;

    public override IComponent Build(RenderContext context)
    {
        return new Container {
            ClassName = "counter",
            Children = {
                new Heading($"Count: {_count}", 1),
                new Row {
                    Gap = "1rem",
                    Children = {
                        new Button {
                            Text = "+",
                            OnClick = () => SetState(() => _count++)
                        },
                        new Button {
                            Text = "Server +",
                            OnClick = async () => {
                                _count = await Component.IncrementOnServer(_count);
                                SetState(() => {});
                            }
                        }
                    }
                }
            }
        };
    }
}