使用setter上的Action管理getter/setter的更好方法

type SetterAction<T> = (value: T) => T | void;

class Product {
  private _price: number = 0;

  set price(value: number) {
    this._price = applyPriceActions(value, [validatePrice, logPriceChange]);
  }

  get price(): number { return this._price; }
}

// 定义 Action
const validatePrice: SetterAction<number> = (value) => {
  if (value < 0) throw new Error("Price cannot be negative");
  return value;
};

const logPriceChange: SetterAction<number> = (value) => {
  console.log(`Price updated to ${value}`);
};

// 执行 Action 链
function applyPriceActions(value: number, actions: SetterAction<number>[]): number {
  return actions.reduce((val, action) => action(val) ?? val, value);
}

interface SetterAction<T> {
  execute(value: T): T;
}

class DiscountAction implements SetterAction<number> {
  execute(price: number): number {
    return price * 0.9; // 10% 折扣
  }
}

class Product {
  private _price: number = 0;
  private actions: SetterAction<number>[] = [new DiscountAction()];

  set price(value: number) {
    this._price = this.actions.reduce((val, action) => action.execute(val), value);
  }
}

@action([validatePrice, logPriceChange])
set price(value: number) { ... }