Half-Life: Alyx, like previous Source titles such as Garry's Mod, is able to use Lua scripts natively when building custom levels using the Hammer editor. Scripts can be used for a variety of things including creating new game modes, weapons and other types of complicated logic.
Introduction to Source 2 VScript
- Getting started with Lua for Half Life: Alyx.
- Hello, Gordon: Introduction to Entity Script Integration With Hammer for Half-Life: Alyx.