// WITH_STDLIB
// TARGET_BACKEND: JS_IR
// FILE: main.js
Math.atanh = function atanh(x) {
    atanh.called = true;
    switch (x) {
        case -1: return -Infinity
        case 0: return 0.0
        case 0.5: return 0.5493061443340548
        case 1: return Infinity
    }
}

// FILE: main.kt
import kotlin.math.atanh

fun box(): String {
    assertEquals(atanh(-1.0), Double.NEGATIVE_INFINITY)
    assertEquals(atanh(0.0), 0.0)
    assertEquals(atanh(0.5), 0.5493061443340548)
    assertEquals(atanh(1.0), Double.POSITIVE_INFINITY)

    assertEquals(js("Math.atanh.called"), true)

    return "OK"
}