Your first step to creating a PWA in Visual Studio 2019 (I used the Community Edition Preview) is to select the Blazor App template in the File | New Project dialog. After starting the Blazor App ...

New functionality for the ASP.NET Core web-dev component of .NET 7 starts out with several enhancements to Blazor, which lets Microsoft-centric web coders use their favorite programming language, C#, ...