The following code is from https://docs.microsoft.com/en-us/azure/azure-functions/dotnet-isolated-process-guide
using Microsoft.Extensions.DependencyInjection;
var host = new HostBuilder()
.ConfigureFunctionsWorkerDefaults()
.ConfigureServices(s =>
{
s.AddSingleton<IHttpResponderService, DefaultHttpResponderService>();
})
.Build();
await host.RunAsync();
What is the F# equivalent?