typescript最后一行一直报错。请问有没有什么比较好看的处理方法？

Question

错误信息↓
Property 'count' does not exist on type 'MyClass'.

typescript在线编辑网站

function countInstances(value: any, context: any) {
  let instanceCount = 0;

  return class extends value {
    constructor(...args: any[]) {
      super(...args);
      instanceCount++;
      this.count = instanceCount;
    }
  };
}

@countInstances
class MyClass {}

const inst1 = new MyClass();
inst1 instanceof MyClass; // true
inst1.count; // 1

Answer 1

显示声明count

return class extends value {
    count: number; // ✅ 显式声明 `count`

    constructor(...args: any[]) {
      super(...args);
      instanceCount++;
      this.count = instanceCount;
    }
  };