Thank you for using Syncfusion products.
We have checked the reported issue in Angular 5 Application with ej-reportViewer. We have deployed this sample in IIS server by creating production build and the sample working fine in our end & not able to reproduce the reported issue. Please find the video demonstration from the below link.
However, we would like to know the following details.
1. Please provide more details about your facing issue (while deploying) to replicated it in our end If possible please share us the replication steps.
2. Confirm whether you are integrating with Angular with ASP.NET CORE? If not, please provide details about your application configuration.
Could you please check the above video and get back to us with the above requested details so that we can analyze based on that and provide you a better solution quickly?