C#: How do you work with SignalR?

1public class ChatHub : Hub
2{
3    public async Task SendMessage(string user, string message)
4    {
5        await Clients.All.SendAsync("ReceiveMessage", user, message);
6    }
7}

1builder.Services.AddSignalR();
2app.MapHub<ChatHub>("/chat");

1const connection = new signalR.HubConnectionBuilder()
2    .withUrl("/chat")
3    .build();
4
5connection.on("ReceiveMessage", (user, message) => {
6    console.log(`${user}: ${message}`);
7});
8
9await connection.start();