如何推断通过计算属性访问的对象元素的类型？

const obj = {
  key: 'value'
};

const keyType = typeof obj['key'];
console.log(keyType); // 输出：string

class MyClass {
  constructor() {
    this.property = 'value';
  }
}

const obj = new MyClass();

const propertyType = obj['property'] instanceof MyClass ? 'MyClass' : typeof obj['property'];
console.log(propertyType); // 输出：MyClass

const obj = {
  key: [1, 2, 3]
};

const keyType = Object.prototype.toString.call(obj['key']).slice(8, -1);
console.log(keyType); // 输出：Array