---@diagnostic disable: missing-return, lowercase-global
---@meta

---@return 1nil inLockdown
---Returns whether the user interface is protected due to combat. Non-Blizzard code is allowed to perform certain UI actions (such as changing secure template attributes or moving/showing/hiding secure frames) only if the player is not in combat; this function can be used to determine whether such actions are currently available.
function InCombatLockdown() end