There should be a simple global function used to determine if the script is running on Lune or not

[zaiisao]

Some code may be designed to run on both Roblox and on Lune. Right now the cleanest way to determine if the script is running on Lune is to do something like if pcall(require, "@lune/fs") then which is what I'm doing now, but this seems a bit messy.

[filiptibell]

The next release of Lune will have the standard _VERSION global, in this format:
Lune x.y.z+luau
so the current version would be:
Lune 0.6.5+567
meaning you will be able to check using something like this:

if type(_VERSION) == "string" and string.sub(_VERSION, 1, 4) === "Lune" then
    -- Running in Lune
else
    -- Running in Roblox
end