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Anyone can say how I can describe in jsruntime property that is function in my external interface?

(Corrected `native` to `external` - I just mis-remembered)
I believe you can use `external` declarations to accomplish what you are looking for.  Example of an external declaration:
`external fun Window.atob(value: String): String`
The above would give you access to this:
<https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/atob>
External declarations are more or less a statement of, "at runtime, this function/field will be available and will be structured like this."

actually I’ve got access to this methods with `external` keyword
```
/**
 * <https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onInstalled>
 */
external interface OnInstalled {
    fun hasListeners(): Boolean
    fun hasListener(listener: EventListener): Boolean
    /**
     * @param details
     */
    fun addListener(listener: (Details) -&gt; Unit)
    fun removeListener(details: Details)
}
```
but didn’t understand how to get properties

You are correct.  You can do properties the same way.

I mis-remembered the keyword.  It's external.
`external val Something.nameOfField: Type`