main.js

var roleHarvester = require('role.harvester');
var roleUpgrader = require('role.upgrader');

module.exports.loop = function () {

    for(var name in Memory.creeps) {
        if(!Game.creeps[name]) {
            delete Memory.creeps[name];
            console.log('Clearing non-existing creep memory:', name);
        }
    }

    var harvesters = _.filter(Game.creeps, (creep) => creep.memory.role == 'harvester');
    //console.log('Harvesters: ' + harvesters.length);

    if(harvesters.length < 2) {
        var newName = Game.spawns['Spawn1'].createCreep([WORK,CARRY,MOVE], undefined, {role: 'harvester'});
        console.log('Spawning new harvester: ' + newName);
    }

    for(var name in Game.creeps) {
        var creep = Game.creeps[name];
        if(creep.memory.role == 'harvester') {
            roleHarvester.run(creep);
        }
        if(creep.memory.role == 'upgrader') {
            roleUpgrader.run(creep);
        }
    }
}