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LibJS: Implement the Promise.withResolvers proposal

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https://github.com/tc39/proposal-promise-with-resolvers
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Timothy Flynn 2023-07-12 15:28:03 -04:00 • committed by Linus Groh
parent 705e96568c
commit 36d156428b
4 changed files with 87 additions and 1 deletions
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28
Userland/Libraries/LibJS/Runtime/PromiseConstructor.cpp
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@ -259,6 +259,7 @@ ThrowCompletionOr<void> PromiseConstructor::initialize(Realm& realm)
define_native_function(realm, vm.names.race, race, 1, attr);
define_native_function(realm, vm.names.reject, reject, 1, attr);
define_native_function(realm, vm.names.resolve, resolve, 1, attr);
define_native_function(realm, vm.names.withResolvers, with_resolvers, 0, attr);
define_native_accessor(realm, vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
@ -487,4 +488,31 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::symbol_species_getter)
return vm.this_value();
}
// 1.1.1.1 Promise.withResolvers ( ), https://tc39.es/proposal-promise-with-resolvers/#sec-promise.withResolvers
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::with_resolvers)
{
auto& realm = *vm.current_realm();
// 1. Let C be the this value.
auto constructor = vm.this_value();
// 2. Let promiseCapability be ? NewPromiseCapability(C).
auto promise_capability = TRY(new_promise_capability(vm, constructor));
// 3. Let obj be OrdinaryObjectCreate(%Object.prototype%).
auto object = Object::create(realm, realm.intrinsics().object_prototype());
// 4. Perform ! CreateDataPropertyOrThrow(obj, "promise", promiseCapability.[[Promise]]).
MUST(object->create_data_property_or_throw(vm.names.promise, promise_capability->promise()));
// 5. Perform ! CreateDataPropertyOrThrow(obj, "resolve", promiseCapability.[[Resolve]]).
MUST(object->create_data_property_or_throw(vm.names.resolve, promise_capability->resolve()));
// 6. Perform ! CreateDataPropertyOrThrow(obj, "reject", promiseCapability.[[Reject]]).
MUST(object->create_data_property_or_throw(vm.names.reject, promise_capability->reject()));
// 7. Return obj.
return object;
}
}