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https://github.com/RGBCube/serenity
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LibJS: Add the WeakRef.prototype.deref method
This is the only exposed method of the WeakRef built-in.
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3 changed files with 41 additions and 0 deletions
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@ -18,6 +18,8 @@ void WeakRefPrototype::initialize(GlobalObject& global_object)
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auto& vm = this->vm();
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Object::initialize(global_object);
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define_native_function(vm.names.deref, deref, 0, Attribute::Writable | Attribute::Configurable);
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define_property(vm.well_known_symbol_to_string_tag(), js_string(global_object.heap(), vm.names.WeakRef), Attribute::Configurable);
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}
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@ -25,4 +27,19 @@ WeakRefPrototype::~WeakRefPrototype()
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{
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}
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// 26.1.3.2 WeakRef.prototype.deref ( ), https://tc39.es/ecma262/#sec-weak-ref.prototype.deref
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JS_DEFINE_NATIVE_FUNCTION(WeakRefPrototype::deref)
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{
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auto* this_object = vm.this_value(global_object).to_object(global_object);
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if (!this_object)
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return {};
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if (!is<WeakRef>(this_object)) {
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vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "WeakRef");
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return {};
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}
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auto& weak_ref = static_cast<WeakRef&>(*this_object);
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weak_ref.update_execution_generation();
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return weak_ref.value() ?: js_undefined();
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}
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}
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@ -17,6 +17,9 @@ public:
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WeakRefPrototype(GlobalObject&);
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virtual void initialize(GlobalObject&) override;
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virtual ~WeakRefPrototype() override;
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private:
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JS_DECLARE_NATIVE_FUNCTION(deref);
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};
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}
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@ -0,0 +1,21 @@
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test("length is 0", () => {
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expect(WeakRef.prototype.deref).toHaveLength(0);
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});
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test("basic functionality", () => {
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var original = { a: 1 };
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var weakRef = new WeakRef(original);
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expect(weakRef.deref()).toBe(original);
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});
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test("kept alive for current synchronous execution sequence", () => {
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var weakRef;
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{
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weakRef = new WeakRef({ a: 1 });
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}
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weakRef.deref();
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gc();
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// This is fine 🔥
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expect(weakRef.deref()).not.toBe(undefined);
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});
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