onUnMount for Stage about pixi-react HOT 8 CLOSED

export class App extends React.Component<AppProps>{

  stageMount(app: any, container: HTMLElement){
    const width =  Number(window.getComputedStyle(container).width.replace("px",""));
    const height = Number(window.getComputedStyle(container).height.replace("px",""));
    const scale = width / APP_DEFAULT.canvasWidth < height / APP_DEFAULT.canvasHeight ?
      width / APP_DEFAULT.canvasWidth : height / APP_DEFAULT.canvasHeight;
      app.renderer.resize(APP_DEFAULT.canvasWidth * scale, APP_DEFAULT.canvasHeight * scale);
      app.stage.scale.set(scale, scale);
  }

  createObserver(app: any, container: HTMLElement){
    app.ResizeObserver = new ResizeObserver((entries, observer) => {
      for (const entry of entries) {
          this.stageMount(app, entry.target as HTMLElement);
      }
    });
    app.ResizeObserver.observe(container);
  }

  render(){
    return (
      <Stage 
        height={1080} 
        width={1920} 
        options={{
          backgroundColor: 0x10bb99,
          antialias: true
        }}
        onMount={ app  => {
          this.stageMount(app, this.props.container);
          this.createObserver(app, this.props.container);
        }}
      >
        <Text text="Hello World" x={200} y={200} /> 
      </Stage>
    )
  }
  
}