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LibWeb: Implement PromiseRejectionEvent

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This paves the way for the rejectionhandled and unhandledrejection
events.

It's also used by core-js (in browsers, at least) to check whether
Promise needs to be polyfilled, so adding it should allow more websites
to leverage LibJS's native Promise implementation :^)
This commit is contained in:
Linus Groh 2021-10-11 12:59:45 +01:00
parent 661dd32432
commit f952db1a1f
6 changed files with 75 additions and 0 deletions
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52
Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h Normal file
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/*
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/Value.h>
#include <LibWeb/DOM/Event.h>
namespace Web::HTML {
struct PromiseRejectionEventInit : public DOM::EventInit {
JS::Handle<JS::Promise> promise;
JS::Value reason;
};
class PromiseRejectionEvent : public DOM::Event {
public:
using WrapperType = Bindings::PromiseRejectionEventWrapper;
static NonnullRefPtr<PromiseRejectionEvent> create(FlyString const& event_name, PromiseRejectionEventInit const& event_init = {})
{
return adopt_ref(*new PromiseRejectionEvent(event_name, event_init));
}
static NonnullRefPtr<PromiseRejectionEvent> create_with_global_object(Bindings::WindowObject&, FlyString const& event_name, PromiseRejectionEventInit const& event_init)
{
return PromiseRejectionEvent::create(event_name, event_init);
}
virtual ~PromiseRejectionEvent() override = default;
// Needs to return a pointer for the generated JS bindings to work.
JS::Promise const* promise() const { return m_promise.cell(); }
JS::Value reason() const { return m_reason; }
protected:
PromiseRejectionEvent(FlyString const& event_name, PromiseRejectionEventInit const& event_init)
: DOM::Event(event_name, event_init)
, m_promise(event_init.promise)
, m_reason(event_init.reason)
{
}
JS::Handle<JS::Promise> m_promise;
// FIXME: Protect this from GC! Currently we have no handle for arbitrary JS::Value.
JS::Value m_reason;
};
}