How to solve this warning in render()?

Question

Vue.js

Vue 3
Hello, can you tell me how to remove this warning:

Non-function value encountered for default slot. Prefer function slots for better performance.

// DeepL переводчик:
Нефункциональное значение, встречающееся для слота по умолчанию. 
Предпочтительные функциональные слоты для лучшей производительности

It happens because of a piece of code like this:

export default {
  render() {
    return [
      h('ul', this.$slots.default().map(slot => h('li', slot)))
    ]
  }
}

As I understand it, he suggests that I do something for better performance,
but I don’t understand what exactly

Answer 1

this.$scopedSlots

Answer 2

In vue 3, scoped slots have been merged into slots.
Now we need to write $slots instead of $scopedSlots.
https://v3.vuejs.org/guide/migration/slots-unifica...