Provide Lazy<T> in kotlin package — an interface that represents lazily computed value. Read-only properties can be delegated to lazy with the extension getter. Delegates.lazy and blockingLazy are deprecated.

js/js.libraries/src/core/kotlin.kt

@@ -49,4 +49,8 @@ public fun setOf<T>(value: T): Set<T> = hashSetOf(value)
  * Returns an immutable map, mapping only the specified key to the
  * specified value.
  */
-public fun mapOf<K, V>(keyValuePair: Pair<K, V>): Map<K, V> = hashMapOf(keyValuePair)
+public fun mapOf<K, V>(keyValuePair: Pair<K, V>): Map<K, V> = hashMapOf(keyValuePair)
+
+
+public fun lazy<T>(initializer: () -> T): Lazy<T> = UnsafeLazyImpl(initializer)
+public fun lazy<T>(mode: LazyThreadSafetyMode, initializer: () -> T): Lazy<T> = UnsafeLazyImpl(initializer)