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hasItem, hasCooldown, repairCost = 
 Tooltip:SetInventoryItem("unit", invSlot {, nameOnly, hideUselessStats});


This function sets a tooltip widget to display information for the given unit's given inventory slot.


Arguments
unit 
String - the unit whose inventory should be searched
slot 
Number - the inventory slot number to search
nameOnly 
Boolean - Only show following info: name, item level, equipment slot, item type, onUse/Proc/Azerite info, durability, race/class limitations
hideUselessStats
Boolean - exclude useless (grey) stats. I.e. agility for a warrior.

Returns
hasItem 
Boolean - is there an item at the given slot?
hasCooldown 
Boolean - unknown
repairCost 
Number - cost of repairing item

Example
--See if the player has head gear and if it is broken
function HasHeadGear()
 local headSlot = getglobal("CharacterHeadSlot");
 local hasItem, hasCooldown, repairCost =
  MyTooltip:SetInventoryItem("player", headSlot:GetID());
 if ((hasItem) and (repairCost) and (repairCost > 0)) then
  return true;
 else
  return false;
 end
end



Source

This information was obtained via a Google cached page of a Thottbot index of a now expired official US beta forum post by Angarth. It appears to still be correct.

repairCost info obtained from orginal blizzard lua files (PaperDolFrame.lua and MoneyFrame.lua)

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