Lua

It is possible to embed Lua scripts into missions with LuaScript / LuaScriptFile keys.

The scripts are parsed once when the game switches a mission, or when the map reset vote is called

Lua programming guide is available at https://www.lua.org/pil/1.html and a quick reference at https://www.lua.org/manual/5.4/

Mission lua scripts are managed by $script_manager entity called popscript

scripts/globals.lua is always parsed before mission scripts

scripts/library.lua contains function definitons provided by the game library