spawner.js

let roles = [
    'harvester',
    'upgrader'
];

module.exports.roles = []

module.exports.executeSpawns = function() {
    let currentCount;
    let role;
    for(var name of roles) {
        role = require(name);
        module.exports.roles.push(role);

        currentCount = (_.filter(Game.creeps, (creep) => creep.memory.role == name)).length;
        if (currentCount < role.spawnInfo.count) {
            Game.spawns['Spawn1'].spawnCreep(role.body, role.spawnInfo.label + Game.time, {memory: {...role.spawnInfo.startMemory, role: name}});
        }
    }
}