squash a bunch of commits

Shogi.UI/Shared/LocalStorage.cs

@@ -0,0 +1,51 @@
+using Microsoft.JSInterop;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Shogi.UI.Shared
+{
+	public class LocalStorage : ILocalStorage
+	{
+		private readonly JsonSerializerOptions jsonOptions;
+		private readonly IJSRuntime jSRuntime;
+
+		public LocalStorage(IJSRuntime jSRuntime)
+		{
+			jsonOptions = new JsonSerializerOptions();
+			jsonOptions.Converters.Add(new JsonStringEnumConverter());
+			this.jSRuntime = jSRuntime;
+		}
+
+		public ValueTask Set<T>(string key, T value)
+		{
+			var serialized = JsonSerializer.Serialize(value);
+			return jSRuntime.InvokeVoidAsync("localStorage.setItem", key, serialized);
+		}
+
+		public async ValueTask<T?> Get<T>(string key) where T : struct
+		{
+
+			var value = await jSRuntime.InvokeAsync<string>("localStorage.getItem", key);
+			try
+			{
+				return JsonSerializer.Deserialize<T>(value, jsonOptions);
+			}
+			catch (ArgumentNullException)
+			{
+				return default;
+			}
+		}
+
+		public ValueTask Delete(string key)
+		{
+			return jSRuntime.InvokeVoidAsync("localStorage.removeItem", key);
+		}
+	}
+
+	public interface ILocalStorage
+	{
+		ValueTask Delete(string key);
+		ValueTask<T?> Get<T>(string key) where T : struct;
+		ValueTask Set<T>(string key, T value);
+	}
+}