If you look in the CordovaApp.Windows.jsproj file that is generated, the last two lines near the bottom reference typescript. If you comment those out, these bulid errors go away. I don’t know how to modify the templating process so the file is created without these lines but if you then load the project in Visual Studio it builds.
However, doing so just yields me an app that shows the splash screen and does nothing else.
Resolved by adding Exclude directive in CordovaApp.projitems file:
replace this line
<TypeScriptCompile Include="$(MSBuildThisFileDirectory)www\**" />
<Content Include="www\**" Exclude="**\*.ts"/>