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// |reftest| shell-option(--enable-symbols-as-weakmap-keys) skip-if(release_or_beta||!this.hasOwnProperty('FinalizationRegistry')||!xulRuntime.shell) -- symbols-as-weakmap-keys is not released yet, FinalizationRegistry is not enabled unconditionally, requires shell-options
// Copyright (C) 2022 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-finalization-registry.prototype.unregister
description: >
Return boolean values indicating unregistering of values with Symbol token
info: |
FinalizationRegistry.prototype.unregister ( _unregisterToken_ )
4. Let _removed_ be *false*.
5. For each Record { [[WeakRefTarget]], [[HeldValue]], [[UnregisterToken]] }
_cell_ of _finalizationRegistry_.[[Cells]], do
a. If _cell_.[[UnregisterToken]] is not ~empty~ and
SameValue(_cell_.[[UnregisterToken]], _unregisterToken_) is *true*, then
i. Remove _cell_ from _finalizationRegistry_.[[Cells]].
ii. Set _removed_ to *true*.
6. Return _removed_.
features: [FinalizationRegistry, Symbol, symbols-as-weakmap-keys]
---*/
var fn = function() {};
var reg = new FinalizationRegistry(fn);
var target1 = {};
var target2 = {};
var target3 = {};
var token = Symbol('unregister');
assert.sameValue(reg.unregister(token), false, 'unregistering regular symbol from empty registry');
assert.sameValue(reg.unregister(Symbol.hasInstance), false, 'unregistering well-known symbol from empty registry');
reg.register(target1, undefined, token);
reg.register(target1, undefined, token); // Repeat registering on purpose
reg.register(target2, undefined, Symbol.hasInstance);
reg.register(target3, undefined, Symbol.hasInstance);
assert.sameValue(reg.unregister(token), true, 'unregistering regular symbol from finalization registry');
assert.sameValue(reg.unregister(token), false, 'unregistering regular symbol again from finalization registry');
assert.sameValue(
reg.unregister(Symbol.hasInstance),
true,
'unregistering well-known symbol to remove target2 and target3'
);
assert.sameValue(
reg.unregister(Symbol.hasInstance),
false,
'unregistering well-known again from finalization registry'
);
// Notice these assertions take advantage of adding targets previously added
// with a token, but now they have no token so it won't be used to remove them.
reg.register(target1, token); // heldValue, not unregisterToken
reg.register(target2, Symbol.hasInstance); // heldValue, not unregisterToken
reg.register(target3);
assert.sameValue(reg.unregister(token), false, 'nothing to remove with regular symbol unregister token');
assert.sameValue(
reg.unregister(Symbol.hasInstance),
false,
'nothing to remove with well-known symbol unregister token'
);
reportCompare(0, 0);
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