module.exports = { setup: function () { Room.prototype = _Room.prototype; } } class _Room extends Room { begin(){} tick(){ const creepsCount = this.find(FIND_MY_CREEPS).length; console.log(creepsCount); if(creepsCount < 5){ const spawn = this.find(FIND_MY_STRUCTURES, {filter: {structureType: STRUCTURE_SPAWN}})[0]; spawn.createHarvester(); } } }