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// Copyright 2026 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-intl.datetimeformat
description: Property descriptor of %Intl%.[[FallbackSymbol]]
info: |
ChainDateTimeFormat ( dateTimeFormat, newTarget, this )
1.a. Perform ? DefinePropertyOrThrow(_this_, %Intl%.[[FallbackSymbol]],
PropertyDescriptor{ [[Value]]: _dateTimeFormat_, [[Writable]]: *false*,
[[Enumerable]]: *false*, [[Configurable]]: *false* }).
includes: [propertyHelper.js]
features: [intl-normative-optional]
---*/
const object = Object.create(Intl.DateTimeFormat.prototype);
const fallbackDTF = Intl.DateTimeFormat.call(object);
assert.sameValue(object, fallbackDTF, "return value of Intl.DateTimeFormat constructor");
const symbolProps = Object.getOwnPropertySymbols(fallbackDTF);
const fallbackSymbol = symbolProps.find((sym) => sym.description === "IntlLegacyConstructedSymbol");
assert(
fallbackDTF[fallbackSymbol] instanceof Intl.DateTimeFormat,
"value of legacy symbol property must be an Intl.DateTimeFormat"
);
verifyProperty(
fallbackDTF,
fallbackSymbol,
{
writable: false,
enumerable: false,
configurable: false
},
{ label: "%Intl%.[[FallbackSymbol]]" }
);
reportCompare(0, 0);