Startup.cs

using System;
using JavaScriptEngineSwitcher.Core;
using JavaScriptEngineSwitcher.Msie;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using React.AspNet;

namespace React.Sample.Router.CoreMvc
{
	public class Startup
	{
		public Startup(IConfiguration configuration)
		{
			Configuration = configuration;
		}

		public IConfiguration Configuration { get; }

		// This method gets called by the runtime. Use this method to add services to the container.
		public IServiceProvider ConfigureServices(IServiceCollection services)
		{
			services.AddMvc();
			services.AddReact();
			services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
			
			// Build the intermediate service provider then return it
			return services.BuildServiceProvider();
		}

		// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
		public void Configure(IApplicationBuilder app, IHostingEnvironment env)
		{
			if (env.IsDevelopment())
			{
				app.UseDeveloperExceptionPage();
			}

			app.UseStaticFiles();

			// Initialise ReactJS.NET. Must be before static files.
			app.UseReact(config =>
			{
				config
					.SetReuseJavaScriptEngines(true)
					.SetLoadBabel(false)
					.SetLoadReact(false)
					.AddScriptWithoutTransform("~/components-bundle.generated.js");
			});

			app.UseMvc(routes =>
			{
				routes.MapRoute("default", "{path?}", new { controller = "Home", action = "Index" });
			});
		}
	}
}