toList

Returns a List containing all elements produced by this stream.

fun <T> Stream<T>.toList(): List<T>(source)

import java.util.stream.Stream
import kotlin.streams.toList

fun main() {
    val numbers = Stream.of(10, 20, 30)
    val list: List<Int> = numbers.toList()
    println(list)  // prints [10, 20, 30]
}

Source