Umbraco-CMS/src/Umbraco.Web.UI/Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace Umbraco.Cms.Web.UI
{
    public class Program
    {
        public static void Main(string[] args)
            => CreateHostBuilder(args)
                .Build()
                .Run();

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
#if DEBUG
                .ConfigureAppConfiguration(config
                    => config.AddJsonFile(
                            "appsettings.Local.json",
                            optional: true,
                            reloadOnChange: true))
#endif
                .ConfigureLogging(x => x.ClearProviders())
                .ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup<Startup>());
    }
}