What problem does this feature solve?

I have cesium in my project, usually, i mount cesium object to this, but not in data, so it's not responsive, for improve performance. like this this.viewer = new Cesium.Viewer(). now, i update to vue3 and typescript, any place i need cesium object must use like (this as any).viewer = viewer. is there any way to extend an unreponsive property ?

What does the proposed API look like?

interface {

}

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