https://github.com/Mijyuoon/starfall with all non-moonscript related stuff ripped out. Mijyuoon did all the work so donate/pay respect/whatever to him.
The best way is probably using git clone --depth 1 https://github.com/wyozi/gmod-moonscript in addons folder.
See http://moonscript.org/reference/api.html and replace all require with loadmodule
local moonscript = loadmodule("moonscript.base")
local fn = moonscript.loadstring 'print "hi!"'
fn()
local code, line_table = moonscript.to_lua 'print "hi!"'
print(code, line_table)MoonScript compiler uses LPeg. To make it have better performance copy files from gm_lpeg// to garrysmod/lua/bin/