[Kanegasi]

For a more in-depth explanation, ... in Lua is called a vararg, short for variable arguments. It is used when defining a function when the number of arguments being passed to it is unknown.

function fooBar(...)
    local test1, test2 = ...
    print(test1, test2)
end
 
fooBar("apple")
fooBar("orange", "banana")

There's another level to WoW's coding we don't see, which is written in C++. When this internal structure loads an addon, each file in the addon is actually one big function.

We see:

local _, ns = ...
-- rest of our file

What's actually happening:

function addonFile(...)
    local _, ns = ...
    -- rest of our file
end
 
addonFile("Name of AddOn", privateTable)

This privateTable is shared across all loaded files within an addon, basically each .toc file gets its own table.