// Copyright (C) 2017 Robin Templeton. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-bigint.prototype.valueof
description: >
  Throws a TypeError if this is an Object without a [[BigIntData]] internal.
info: |
  BigInt.prototype.valueOf ( )

  1. Return ? thisBigIntValue(this value).

  The abstract operation thisBigIntValue(value) performs the following steps:

  1. If Type(value) is BigInt, return value.
  2. If Type(value) is Object and value has a [[BigIntData]] internal slot, then
    ...
  3. Throw a TypeError exception.
features: [BigInt]
---*/

var valueOf = BigInt.prototype.valueOf;
assert.sameValue(typeof valueOf, 'function');

assert.throws(TypeError, function() {
  valueOf.call({});
}, "{}");

assert.throws(TypeError, function() {
  valueOf.call(Object(1));
}, "Object(1)");