Node JS 在 promise [duplicate] 中使用私有函数

问：

我有以下代码：

export class TestClass {

    #dbConnection;

    connectToDatabase = async () => {
        this.#dbConnection = mysql.createConnection({
            host: 'xx.xx.xx.xx',
            user: 'user',
            password: 'password',
            database: 'gtfs'
        });
        return await this.#dbConnection.connect();
    }

    doSomething = async () => {
        return new Promise((resolve, reject) => {
            this.#dbConnection.query(query, function (error, result) {
                if (err) reject(err);
                let privateThing = this.#doSomethingPrivate();
                resolve(privateThing);
            })
        });
    }

    #doSomethingPrivate = () => {
        return 'all good';
    }
}

let test = new TestClass()
test.connectToDatabase()
    .then(doSomething)
    .then((data) => {
        console.log(data);
    });

但是在里面，我实际上不能打电话，因为它是私人的。我该怎么做？doSomething#doSomethingPrivate