class State {
  /**
   * @type {number}
   */
  money = 0;

  /**
   * @type {Monster[]}
   */
  monsters = [];

  /**
   * @type {Item[]}
   */
  inventory = [];

  /**
   * @type {Monster[]}
   */
  partyMonsters = [];

  /**
   * @type {Monster}
   */
  activeMonster = null;

  /**
   * @type {Technique}
   */
  activeTechnique = null;

  enemy = {
    /**
     * @type {Monster}
     */
    monster: null,
  };
};