JS/TSのclassでclass名を取得する

class BaseApp {
    constructor() {
        console.log('1:' + this.constructor.name)
        console.log('2:' + this.getClassName())
    }

    getClassName() {
        return this.constructor.name
    }
}

class App extends BaseApp {
    constructor() {
        super()
        console.log('3:' + this.constructor.name)
        console.log('4:' + super.constructor.name)
    }
}

class ExApp extends App {
    constructor() {
        super()
        console.log('5:' + this.constructor.name)
        console.log('6:' + super.constructor.name)
    }
}

const app = new ExApp()
console.log('7:'  +app.constructor.name)

1:ExApp
2:ExApp
3:ExApp
4:BaseApp
5:ExApp
6:App
7:ExApp