[lightspark]

Originally Posted by Resike What do you mean by pre-hooking? Of course if your hook is wrong it's not gonna work. Or if a hook does not actually hook than don't call it a hook.

local oldBlizzFunc = BlizzFunc
 
function BlizzFunc(...)
    -- your stuff here
 
    oldBlizzFunc(...)
end

People either do this thingy or replace Blizz function entirely to prevent it from doing something, quite common for bag addons.

In this case, if you create an upvalue for a function before some other addon redefines it, you'll be calling original function.

It's not a proper hook, that's why I wrote it in quotes.