我正在帮助一个使用MongoDB来持久化数据的 typescript 应用程序。我们正在尝试做的事情之一是摆脱any的使用。
下面的代码用于定义mongoose模式的一部分：

priceMax: {
  max: 10000000,
  min: 0,
  required: function (this: FeePricing & Document) {
    return this.priceMin === undefined;
  },
  type: Number,
  validate: [
    {
      message: 'Max price cannot be lower than min price',
      validator: function (v: number) {
        if ((this as any).priceMax === null || (this as any).priceMax === undefined) return true;
        return (this as any).priceMin ? v >= (this as any).priceMin : v >= 0;
      },
    },
    {
      message: 'Max price cannot be higher than 50000 for this feeType',
      validator: function (v: number) {
        return !(!feeTypesWithoutMaxLimit.includes((this as any).feeType) && v > 50000);
      },
    },
  ],
},
priceMin: {
  max: 10000000,
  min: 0,
  required: function () {
    return (this as any).priceMax === undefined;
  },
  type: Number,
  validate: {
    message: 'priceMin cannot be higher than priceMax',
    validator: function (v: number) {
      return (this as any).priceMax ? v <= (this as any).priceMax : v >= 0;
    },
  },
},
updatedAt: { type: Date },
updatedBy: { type: String },

我大概知道函数在做什么，但是这里的类型让我很困惑。
我怎么才能摆脱this as any？为什么不只是使用FeePricing的类型-例如(this as FeePricing)？FeePricing似乎是只是另一个类型从我的应用程序[，其中priceMin和priceMax]与Document接口相结合。ReactJS的Document在这里有什么帮助？为什么需要它？validate中的this是否为上面定义的类型FeePricing & Document？
谢谢