Game.loop

main.js

console.log('only once!');
var mod = require('mod');

Memory.ticks = 0;

var test = Game.time;

module.exports.loop = function() {
    console.log('tick ' + (Memory.ticks ++) + '!  (var test = ' + test + ')');
}

mod.js

console.log('mod: only once!');

module.exports.foo = function() {
    console.log('mod: tick!');
}