State patterns in Fluxor

FluxorStatePattern-InterfaceExample.cs

using Fluxor;
using Microsoft.Extensions.DependencyInjection;

var services = new ServiceCollection();
services.AddFluxor(x =>
{
	x.ScanAssemblies(typeof(Program).Assembly);
	// CON: Need to explicitly register a reducer type for each feature state
	x.ScanTypes(
		typeof(ChangeCommonStateReducers<State1>), // Register this generic class
		typeof(ChangeCommonStateReducers<State2>)); // Register this generic class
});

var sp = services.BuildServiceProvider();
var dispatcher = sp.GetRequiredService<IDispatcher>();
var store = sp.GetRequiredService<IStore>();
await store.InitializeAsync();
dispatcher.Dispatch(new ChangeCommonState<State1>());
dispatcher.Dispatch(new ChangeCommonState<State2>());
dispatcher.Dispatch(new ChangeCommonState<State2>());
Console.WriteLine("Done");
Console.ReadLine();


public interface ICommonStateOwner<TFeatureState>
{
	CommonState CommonState { get; }
	TFeatureState WithNewCommonState(CommonState newState);
}

public record CommonState(int Counter);

[FeatureState]
public record State1 : ICommonStateOwner<State1>
{
	public CommonState CommonState { get; init; } = new CommonState(0);

	// CON: Need to implement a method on the state class
	public State1 WithNewCommonState(CommonState newState) =>
		this with { CommonState = newState };
}

[FeatureState]
public record State2 : ICommonStateOwner<State2>
{
	public CommonState CommonState { get; init; } = new CommonState(0);

	// CON: Need to implement a method on the state class
	public State2 WithNewCommonState(CommonState newState) =>
		this with { CommonState = newState };
}

public record ChangeCommonState<TFeatureState>();

// PRO: This will be called automatically
public static class ChangeCommonStateReducers<TFeatureState>
	where TFeatureState : ICommonStateOwner<TFeatureState>
{
	[ReducerMethod]
	public static TFeatureState Reduce(
		TFeatureState state, ChangeCommonState<TFeatureState> action)
	=>
		state.WithNewCommonState(state.CommonState with { Counter = state.CommonState.Counter + 1 });
}