How to use the @ffxiv-teamcraft/simulator.CrafterStats function in @ffxiv-teamcraft/simulator

exports.solver = functions.runWith(runtimeOpts).https.onRequest((req, res) => {
  res.set('Access-Control-Allow-Methods', 'POST');
  res.set('Access-Control-Allow-Origin', '*');
  res.set('Access-Control-Allow-Headers', '*');
  res.set('Access-Control-Max-Age', '3600');
  if (req.method === 'OPTIONS') {
    // Send response to OPTIONS requests
    res.status(204).send('');
  } else {
    const stats = new CrafterStats(
      req.body.stats.jobId,
      req.body.stats.craftsmanship,
      req.body.stats.control,
      req.body.stats.cp,
      req.body.stats.specialist,
      req.body.stats.level,
      req.body.stats.levels
    );
    const solver = new Solver(req.body.recipe, stats, req.body.configuration);
    const seed = req.body.seed ? CraftingActionsRegistry.deserializeRotation(req.body.seed) : undefined;
    return res.json(CraftingActionsRegistry.serializeRotation(solver.run(seed)));
  }
});

map(([rotation, gearSets, stats]) => {
        const food = this.foods.find(f => this.rotation.food && f.itemId === this.rotation.food.id && f.hq === this.rotation.food.hq);
        const medicine = this.medicines.find(f => this.rotation.medicine && f.itemId === this.rotation.medicine.id && f.hq === this.rotation.medicine.hq);
        const fcActions = this.freeCompanyActions.filter(action => this.rotation.freeCompanyActions.indexOf(action.actionId) > -1);
        const crafterStats = new CrafterStats(
          stats.jobId,
          stats.craftsmanship + this.getBonusValue('Craftsmanship', stats.craftsmanship, food, medicine, fcActions),
          stats.control + this.getBonusValue('Control', stats.craftsmanship, food, medicine, fcActions),
          stats.cp + this.getBonusValue('CP', stats.craftsmanship, food, medicine, fcActions),
          stats.specialist,
          stats.level,
          gearSets.length > 0 ? gearSets.map(set => set.level) as [number, number, number, number, number, number, number, number] : [70, 70, 70, 70, 70, 70, 70, 70]);
        return new Simulation(rotation.recipe as Craft, CraftingActionsRegistry.deserializeRotation(rotation.rotation), crafterStats).run(true);
      })
    );