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