When developing against SharePoint 2019 on-premises with the last supported SPFx v1.4.1, which is the newest supported version of @pnp/sp that works?
I see that v1.3.9 works - the solution can be built and executed via gulp serve
but I don't want to try by trial and error.
I cannot find it on their documentation and it does not work with current 2.8.0 even with [typescript version workaround] (https://pnp.github.io/pnpjs/SPFx-on-premises/) described on their site.