Typescript 类型脚本中的getter不工作！！！它总是抛出错误或返回未定义

我将一个类划分为框架，然后用另一个扩展它

class Department {
    protected employees: string[] = [];

    constructor(private readonly id: string, public name: string) {
    }

    describe(this: Department) {
        console.log(`Department (${this.id}): ${this.name}`);
    }


    }
}

如上所述使用getter和setter

class AccountingDepartment extends Department{
    private readonly lastReport: string;

    get mostRecentReport() {
        if (this.lastReport) {
            return this.lastReport;
        }
        throw new Error('no report found.');
    }

    set mostRecentReport(value: string) {
        if (!value) {
            throw new Error('enter valid value')
        }
        this.addReport(value);
    }

    constructor(id: string, private reports: string[]) {
        super(id, 'Accounting');
        this.lastReport = reports[0];
    }



    addReport(text: string) {
        this.reports.push(text);
    }

    PrintReport() {
        console.log(this.reports);
    }
}

我做错了什么 我的代码返回错误抛出新错误“未找到报告”；添加后！！ 如果我对错误进行注释，它将返回undefined

在构造函数中初始化lastReport值后，永远不会为其赋值 更新addReport方法，如下所示

const Accounting = new AccountingDepartment('D2', []);

Accounting.addReport('every thing is ok...');
Accounting.mostRecentReport = 'welecome';
Accounting.PrintReport();
console.log(Accounting.mostRecentReport);

---

尝试删除lastReport的readonly，并在AccountingDepartment的构造函数中添加空数组检查此。lastReport=reports[0]//空数组我尝试了这两种方法，如果使用空数组，编译时会出错。

    ...
    private lastReport: string;
    ...
    addReport(text: string) {
        this.reports.push(text);
        this.lastReport = text;
    }
    ...