Why I can't extends PIXI.Application ?

[AG2023]

I tried to extends PIXI.Application to create a game's main class, but when I run the code, browser threw an error :Uncaught (in promise) TypeError: Class constructor _Application cannot be invoked without 'new'.

The code of main class:

export class Game extends PIXI.Application {
  constructor(options) {
    super(options)
  }
}

The code to create game instance:

window.onload = async function () {
  const dom = document.getElementById('my_game');

  const options = {width: 1280, height: 720, backgroundColor: 0x111111, sharedTicker: true, transparent: false};
  const game = new Game();
  await game.init(options);
  dom .appendChild(game.canvas);
};

I do samething in pixi.js v6.5.4, it works OK，but in v8.0.1, it threw an error。

I'd like to know where I did wrong? Thanks !