[JS IR BE] Arrays, varargs

libraries/stdlib/js/irRuntime/hacks.kt

@@ -5,6 +5,8 @@
 
 package kotlin
 
+import kotlin.js.*
+
 // TODO: Ignore FunctionN interfaces
 
 public interface Function0<out R> : Function<R> {
@@ -23,4 +25,22 @@ public interface Function3<in P1, in P2, in P3, out R> : Function<R> {
     public operator fun invoke(p1: P1, p2: P2, p3: P3): R
 }
 
-public inline fun <reified T> arrayOfNulls(size: Int): Array<T?> = js("[]")  // FIXME: Implement
+public inline fun <reified T> arrayOfNulls(size: Int): Array<T?> = Array<T?>(size)
+
+public inline fun <T> arrayOf(vararg a: T): Array<T> = a.unsafeCast<Array<T>>()
+
+public inline fun booleanArrayOf(vararg a: Boolean) = a
+
+public inline fun byteArrayOf(vararg a: Byte) = a
+
+public inline fun shortArrayOf(vararg a: Short) = a
+
+public inline fun charArrayOf(vararg a: Char) = a
+
+public inline fun intArrayOf(vararg a: Int) = a
+
+public inline fun floatArrayOf(vararg a: Float) = a
+
+public inline fun doubleArrayOf(vararg a: Double) = a
+
+public inline fun longArrayOf(vararg a: Long) = a