In the past we often used AutoSPInstaller to set up SharePoint farms which worked quite well.
Recently I heard the recommendation to stop using it since it is not being actively developed anymore. (?)
Which alternative do you use for setting up your on-prem farms?
I have set up several SharePoint 2019 farms with AutoSPInstaller and everything worked well. I can confirm this bug, which can easily be resolved by a simple reboot: Script halted when creating root site collection in SP2019 #38
You can see a bunch of code commits related to SharePoint 2019 in the Github-Repository. The Github Root-Page also notes SP2010-2019 as supported versions.
I think the silence about AutoSPInstaller is mostly because it has become rock-stable over time. The changes from SharePoint 2016 (which introduced MinRoles) to SharePoint 2019 are very limited, so there was not so much to change for AutoSPInstaller-Developers.
My recommendation: Continue to use AutoSPInstaller, as it solves most of the installation hassle out-of-the-box.
+1 to what @MHeld answered.
AutoSPInstaller is going to be supported in SP 2019. However, since you also wanted to know the alternatives to it, you can checkout SharePointDsc. It is a powershell module using which you can manage the farm. It also supports SP 2019 as well.
You can checkout this blog on- How to Get Started with SharePointDSC
There is also a converter available to migrate AutoSPInstaller to SharePointDSC which you can use for your existing scripts
