Singleton Render

Starting from version 0.6.0, the defineOverlay function supports the "only" property, which enables rendering only one pop-up layer.

Please note that renderOverlay function does not support the "only" property and cannot maintain independent instances.

Here is an example using the defineOverlay function with the "only" property:

const myModal = defineOverlay(Inst, { only: true })

// Only one instance will be displayed and returned
myModal()
myModal()
myModal()
myModal()