I need to prevent other classes from instantiating the `Child`

# getting-started

[poohbar]

I need to prevent other classes from instantiating the Child

[aarjav]

maybe you can just use an interface and discourage instantiating it directly?

class Parent {
    companion object {
        fun foo(): Child = Us("field" )
    }

    interface Child {
        val field: String
    }

    private data class Us(override val field: String) : Child
}