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

---@param index number
---Picks up an item from or puts an item in a slot offered for trade by the player. Results vary by context:    If an item is on the cursor and no item is in the trade slot, the item is put into the trade slot and the cursor becomes empty   If no item is on the cursor and an item is in the trade slot, the item is put on the cursor and removed from the trade slot   If an item is on the cursor and an item is in the trade slot, the item from the cursor is put into the trade slot and the item from the trade slot is put on the cursor   If both cursor and trade slot are empty, nothing happens
function ClickTradeButton(index) end
