return list.asList();
    }
    return copyFromCollection(elements);
  }

  @JsMethod
  public static <E> ImmutableList<E> copyOf(E[] elements) {
    checkNotNull(elements); // eager for GWT
    return copyOf(Arrays.asList(elements));
  }

  private static <E> ImmutableList<E> copyFromCollection(Collection<? extends E> collection) {
    Object[] elements = collection.toArray();