javascript - V8 JavaScript : Why do C++ constructor functions filter Proxy?

Question

V8 C++ 代码(测试程序)似乎没有将 Proxy 视为对象，而是返回了默认目标。纯 JavaScript(其他)中的相同场景按预期工作。

C++实现的pass thru函数

static void tester(const FunctionCallbackInfo<Value>& info) {
    if (info.Length() > 0) {
        info.GetReturnValue().Set(info[0]);
    }
}

安装代码(从应用周围收集。)

Local<String> testerString = String::NewFromUtf8(isolate, "tester", NewStringType::kNormal).ToLocalChecked();
Local<ObjectTemplate> globalTemplate = ObjectTemplate::New(isolate);
globalTemplate->Set(testerString, FunctionTemplate::New(isolate, tester), DontEnum);
Local<Context> context = Context::New(isolate, nullptr, globalTemplate, Local<Value>());

JavaScript 测试，交替使用 C++ 和 JavaScript、对象和代理、函数和构造函数。

function other(x) {
    return x;
}

{
    let a = tester({x: 10});
    let b = new tester({x: 10});
    let c = tester(new Proxy({}, {get: function(target, name) { return name; }}));
    let d = new tester(new Proxy({}, {get: function(target, name) { return name; }}));

    print(a.x);
    print(b.x);
    print(c.x);
    print(d.x);
}

{
    let a = other({x: 10});
    let b = new other({x: 10});
    let c = other(new Proxy({}, {get: function(target, name) { return name; }}));
    let d = new other(new Proxy({}, {get: function(target, name) { return name; }}));

    print(a.x);
    print(b.x);
    print(c.x);
    print(d.x);
}

输出:

10
10
x
undefined
10
10
x
x

Answer 1

这里是 V8 开发者。这确实看起来像一个错误。你能提交错误报告吗？