While working on building blockchain node infrastructure, one of the tools I used is Terraform.
The built-in providers in Terraform didn't allow me to check whether a file, or directory exists, or even to create directories.
So I wrote a custom Terraform provider that does that.
It's available on Github now.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes