在课堂上宣布一个私人成员

我在ES6中创建类。 该班有私人成员：

export class Geo{

    constructor(){
        this.#setView();
        this.#setMap();
    }

    #setView(){
            this.view = new View({
            center: location.Reykjavík,
            projection: get,
            zoom: 0,
            constrainResolution: false,
        });
    }

    #setMap(){
        this.map = new Map({
            controls: defaultControls().extend([
                new ScaleLine()
            ]),
            layers: [new Tile({source: new OSM()})],
            target: 'map',
            view: this.view
        });
    } 
     getMap(){
        return this.map;
     }
}

在终端我得到这个错误：

ERROR in ./src/geomodels/geo.js 13:13
Module parse failed: Unexpected character '#' (13:13)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
|
|     constructor(){
>         this.#setView();
|         this.#setMap();
|     }

我的问题是为什么这个字符＃是错误的？如何在课堂上使用私人会员？