TimeoutException: The Angular CLI process did not start listening for requests within the timeout period of 0 seconds

Question

I\'m getting this error after upgrading to angular 9. I\'m using visual studio 2019, ASP .NET core with angular. Even if I create new project and update angular to 9 version

Answer 1

As suggested in https://developercommunity.visualstudio.com/solutions/446713/view.html, you should setup the StartupTimeout configuration setting.

Basically in Startup.cs:

 app.UseSpa(spa =>
    {
      spa.Options.SourcePath = "./";
      //Configure the timeout to 5 minutes to avoid "The Angular CLI process did not start listening for requests within the timeout period of 50 seconds." issue
      spa.Options.StartupTimeout = new TimeSpan(0, 5, 0);
      if (env.IsDevelopment())
      {
        spa.UseAngularCliServer(npmScript: "start");
      }
    });