build.hxml

-main Main
-lua out.lua
-D lua-jit
-cmd lua out.lua

Main.hx

import lua.jit.FFIBuilder;
import lua.Ffi;

class Main {
    static function main() {
        var k=  'hi';
        trace(k.length + " is the value for k.length");
        SomeFfi.printf("foo %s", "hi");
        SomeFfi.puts("fabaoijaowief\n");
    }
}


extern class SomeFfi implements FfiBuilder {
    static function printf(fmt : String, arg : String) : Int;
    static function puts(str : String) : Int;
}