TypeScript:更新联合类型中的通用属性时出错

interface A {
  commonProperty: string;
  specificPropertyA: number;
}

interface B {
  commonProperty: string;
  specificPropertyB: boolean;
}

function updateCommonProperty(obj: A | B, newValue: string): void {
  if ("specificPropertyA" in obj) {
    // 处理类型A
    obj.commonProperty = newValue;
    console.log("Updated common property in type A");
  } else if ("specificPropertyB" in obj) {
    // 处理类型B
    obj.commonProperty = newValue;
    console.log("Updated common property in type B");
  } else {
    // 处理其他情况
    console.log("Invalid object type");
  }
}

// 示例用法
const objA: A = {
  commonProperty: "value",
  specificPropertyA: 42,
};

const objB: B = {
  commonProperty: "value",
  specificPropertyB: true,
};

updateCommonProperty(objA, "new value for A"); // 输出：Updated common property in type A
updateCommonProperty(objB, "new value for B"); // 输出：Updated common property in type B