BetterCreep.js

class BetterCreep extends Creep {
  constructor(creep) {
    this._creep = creep;
  }
  
  work() {
    this._creep.moveTo();
  }
}

Object.keys(Game.creeps).forEach((creepName) => {
  const betterCreep = new BetterCreep(Game.creeps[creepName]);
  betterCreep.work();
});