#include <AK/String.h>
#include <AK/TypeCasts.h>
#include <AK/Variant.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/PropertyKey.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/Bindings/Response.h>
#include <LibWeb/DOMURL/URLSearchParams.h>
#include <LibWeb/Fetch/Headers.h>
#include <LibWeb/Fetch/Response.h>
#include <LibWeb/FileAPI/Blob.h>
#include <LibWeb/Streams/ReadableStream.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Promise.h>
#include <LibWeb/WebIDL/Tracing.h>
#include <LibWeb/WebIDL/Types.h>
#include <LibWeb/XHR/FormData.h>

namespace Web::Bindings {

void ResponseConstructor::initialize(JS::Realm& realm, JS::NativeFunction& object)
{
    auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;

    
    object.define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "Response"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<ResponsePrototype>(realm, "Response"_fly_string), 0);
    object.define_native_function(realm, "error"_utf16_fly_string, error, 0, JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable);

    object.define_native_function(realm, "redirect"_utf16_fly_string, redirect, 1, JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable);

    object.define_native_function(realm, "json"_utf16_fly_string, json, 1, JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable);

}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> ResponseConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "ResponseConstructor::construct");
    auto& vm = constructor.vm();
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // To internally create a new object implementing the interface Response:

    // 3.2. Let prototype be ? Get(newTarget, "prototype").
    auto prototype = TRY(new_target.get(vm.names.prototype));

    // 3.3. If Type(prototype) is not Object, then:
    if (!prototype.is_object()) {
        // 1. Let targetRealm be ? GetFunctionRealm(newTarget).
        auto* target_realm = TRY(JS::get_function_realm(vm, new_target));

        // 2. Set prototype to the interface prototype object for interface in targetRealm.
        VERIFY(target_realm);
        prototype = &Bindings::ensure_web_prototype<ResponsePrototype>(*target_realm, "Response"_fly_string);
    }

    auto arg0 = vm.argument(0);
    Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String, Empty> body = Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String, Empty> { Empty {} };
    if (!arg0.is_undefined())
        body = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String, Empty>> {
        Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String, Empty> value;

        if (!arg0.is_nullish()) {

            value = TRY([&]() -> JS::ThrowCompletionOr<Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String>> {

        if (arg0.is_object()) {
            [[maybe_unused]] auto& object = arg0.as_object();

            if (is<PlatformObject>(object)) {

                if (auto* result = as_if<Streams::ReadableStream>(object))
                    return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { GC::Ref { *result } };

                if (auto* result = as_if<FileAPI::Blob>(object))
                    return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { GC::Ref { *result } };

                if (auto* result = as_if<XHR::FormData>(object))
                    return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { GC::Ref { *result } };

                if (auto* result = as_if<DOMURL::URLSearchParams>(object))
                    return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { GC::Ref { *result } };
            }

            if (auto* array_buffer = as_if<JS::ArrayBuffer>(object)) {
                if (!array_buffer->is_shared_array_buffer()) {
                    // 1. If types includes ArrayBuffer, then return the result of converting V to ArrayBuffer.
                    auto array_buffer_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::ArrayBuffer>> {
        // A JavaScript value V is converted to an IDL ArrayBuffer value by running the following algorithm:
        // 1. If V is not an Object, or V does not have an [[ArrayBufferData]] internal slot, then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::ArrayBuffer>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "ArrayBuffer");

        // 2. If IsSharedArrayBuffer(V) is true, then throw a TypeError.
        if (builtin_buffer->is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V) is false, then throw a TypeError.
        if (!builtin_buffer->is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length ArrayBuffer");

        // 4. Return the IDL ArrayBuffer value that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                    return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { array_buffer_union_type };
                }
            }

            if (as_if<JS::DataView>(object)) {
                // 1. If types includes DataView, then return the result of converting V to DataView.
                auto data_view_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::DataView>> {
        // A JavaScript value V is converted to an IDL DataView value by running the following algorithm:
        // 1. If V is not an Object, or V does not have a [[DataView]] internal slot, then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::DataView>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "DataView");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length DataView");

        // 4. Return the IDL DataView value that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { data_view_union_type };
            }

            if (as_if<JS::Int8Array>(object)) {
                auto int8_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Int8Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Int8Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Int8Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Int8Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { int8_array_union_type };
            }

            if (as_if<JS::Int16Array>(object)) {
                auto int16_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Int16Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Int16Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Int16Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Int16Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { int16_array_union_type };
            }

            if (as_if<JS::Int32Array>(object)) {
                auto int32_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Int32Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Int32Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Int32Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Int32Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { int32_array_union_type };
            }

            if (as_if<JS::Uint8Array>(object)) {
                auto uint8_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Uint8Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Uint8Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Uint8Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Uint8Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { uint8_array_union_type };
            }

            if (as_if<JS::Uint16Array>(object)) {
                auto uint16_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Uint16Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Uint16Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Uint16Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Uint16Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { uint16_array_union_type };
            }

            if (as_if<JS::Uint32Array>(object)) {
                auto uint32_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Uint32Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Uint32Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Uint32Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Uint32Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { uint32_array_union_type };
            }

            if (as_if<JS::Uint8ClampedArray>(object)) {
                auto uint8_clamped_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Uint8ClampedArray>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Uint8ClampedArray>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Uint8ClampedArray");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Uint8ClampedArray");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { uint8_clamped_array_union_type };
            }

            if (as_if<JS::BigInt64Array>(object)) {
                auto big_int64_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::BigInt64Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::BigInt64Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BigInt64Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length BigInt64Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { big_int64_array_union_type };
            }

            if (as_if<JS::BigUint64Array>(object)) {
                auto big_uint64_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::BigUint64Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::BigUint64Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BigUint64Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length BigUint64Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { big_uint64_array_union_type };
            }

            if (as_if<JS::Float16Array>(object)) {
                auto float16_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Float16Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Float16Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Float16Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Float16Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { float16_array_union_type };
            }

            if (as_if<JS::Float32Array>(object)) {
                auto float32_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Float32Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Float32Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Float32Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Float32Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { float32_array_union_type };
            }

            if (as_if<JS::Float64Array>(object)) {
                auto float64_array_union_type = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Float64Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Float64Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Float64Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Float64Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }());
                return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { float64_array_union_type };
            }
        }

        auto body_string = TRY([&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_usv_string(vm, arg0));
    }());
        return Variant<GC::Ref<Streams::ReadableStream>, GC::Ref<FileAPI::Blob>, GC::Ref<JS::Int8Array>, GC::Ref<JS::Int16Array>, GC::Ref<JS::Int32Array>, GC::Ref<JS::Uint8Array>, GC::Ref<JS::Uint16Array>, GC::Ref<JS::Uint32Array>, GC::Ref<JS::Uint8ClampedArray>, GC::Ref<JS::BigInt64Array>, GC::Ref<JS::BigUint64Array>, GC::Ref<JS::Float16Array>, GC::Ref<JS::Float32Array>, GC::Ref<JS::Float64Array>, GC::Ref<JS::DataView>, GC::Ref<JS::ArrayBuffer>, GC::Ref<XHR::FormData>, GC::Ref<DOMURL::URLSearchParams>, String> { body_string };

        return vm.throw_completion<JS::TypeError>("No union types matched"_utf16);
    }());
        }
        return value;
    }(); }));

    auto arg1 = vm.argument(1);
    ResponseInit init = ResponseInit {};
    if (!arg1.is_undefined())
        init = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_response_init(vm, arg1); }));

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return Fetch::Response::construct_impl(realm, body, init); }));

    // 7. Set instance.[[Prototype]] to prototype.
    VERIFY(prototype.is_object());
    impl->set_prototype(&prototype.as_object());

    // FIXME: Steps 8...11. of the "internally create a new object implementing the interface Response" algorithm
    // (https://webidl.spec.whatwg.org/#js-platform-objects) are currently not handled, or are handled within Fetch::Response::construct_impl().

    return *impl;
}

void ResponsePrototype::initialize(JS::Realm& realm, JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable;

    object.set_prototype(realm.intrinsics().object_prototype());

    auto type_id = "type"_utf16_fly_string;
    auto native_type_getter = JS::NativeFunction::create(realm, type_getter, 0, type_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_type_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto type_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(type_id, native_type_getter, native_type_setter, type_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto url_id = "url"_utf16_fly_string;
    auto native_url_getter = JS::NativeFunction::create(realm, url_getter, 0, url_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_url_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto url_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(url_id, native_url_getter, native_url_setter, url_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto redirected_id = "redirected"_utf16_fly_string;
    auto native_redirected_getter = JS::NativeFunction::create(realm, redirected_getter, 0, redirected_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_redirected_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto redirected_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(redirected_id, native_redirected_getter, native_redirected_setter, redirected_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto status_id = "status"_utf16_fly_string;
    auto native_status_getter = JS::NativeFunction::create(realm, status_getter, 0, status_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_status_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto status_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(status_id, native_status_getter, native_status_setter, status_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto ok_id = "ok"_utf16_fly_string;
    auto native_ok_getter = JS::NativeFunction::create(realm, ok_getter, 0, ok_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_ok_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto ok_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(ok_id, native_ok_getter, native_ok_setter, ok_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto status_text_id = "statusText"_utf16_fly_string;
    auto native_status_text_getter = JS::NativeFunction::create(realm, status_text_getter, 0, status_text_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_status_text_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto status_text_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(status_text_id, native_status_text_getter, native_status_text_setter, status_text_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto headers_id = "headers"_utf16_fly_string;
    auto native_headers_getter = JS::NativeFunction::create(realm, headers_getter, 0, headers_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_headers_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto headers_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(headers_id, native_headers_getter, native_headers_setter, headers_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto body_id = "body"_utf16_fly_string;
    auto native_body_getter = JS::NativeFunction::create(realm, body_getter, 0, body_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_body_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto body_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(body_id, native_body_getter, native_body_setter, body_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto body_used_id = "bodyUsed"_utf16_fly_string;
    auto native_body_used_getter = JS::NativeFunction::create(realm, body_used_getter, 0, body_used_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_body_used_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto body_used_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(body_used_id, native_body_used_getter, native_body_used_setter, body_used_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    object.define_native_function(realm, "clone"_utf16_fly_string, clone, 0, default_attributes);

    object.define_native_function(realm, "arrayBuffer"_utf16_fly_string, array_buffer, 0, default_attributes);

    object.define_native_function(realm, "blob"_utf16_fly_string, blob, 0, default_attributes);

    object.define_native_function(realm, "bytes"_utf16_fly_string, bytes, 0, default_attributes);

    object.define_native_function(realm, "formData"_utf16_fly_string, form_data, 0, default_attributes);

    object.define_native_function(realm, "json"_utf16_fly_string, json, 0, default_attributes);

    object.define_native_function(realm, "text"_utf16_fly_string, text, 0, default_attributes);

    object.define_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "Response"_utf16), JS::Attribute::Configurable);
}

void ResponsePrototype::define_unforgeable_attributes(JS::Realm& realm, [[maybe_unused]] JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;
}

[[maybe_unused]] static JS::ThrowCompletionOr<Fetch::Response*> impl_from(JS::VM& vm, JS::Value js_value)
{

    if (auto impl = js_value.as_if<Fetch::Response>())
        return impl.ptr();
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Response");
}

[[maybe_unused]] static JS::ThrowCompletionOr<Fetch::Response*> impl_from(JS::VM& vm)
{
    auto this_value = vm.this_value();
    if (this_value.is_nullish())
        this_value = &vm.current_realm()->global_object();
    return impl_from(vm, this_value);
}

JS_DEFINE_NATIVE_FUNCTION(ResponseConstructor::error)
{
    WebIDL::log_trace(vm, "ResponseConstructor::error");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return Fetch::Response::error(vm); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponseConstructor::redirect)
{
    WebIDL::log_trace(vm, "ResponseConstructor::redirect");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "redirect");

    auto arg0 = vm.argument(0);
    auto url = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_usv_string(vm, arg0));
    }(); }));

    auto arg1 = vm.argument(1);
    WebIDL::UnsignedShort status = 302;
    if (!arg1.is_undefined())
        status = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedShort>(vm, arg1, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return Fetch::Response::redirect(vm, url, status); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponseConstructor::json)
{
    WebIDL::log_trace(vm, "ResponseConstructor::json");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "json");

    auto arg0 = vm.argument(0);
    auto data = TRY(throw_dom_exception_if_needed(vm, [&] { return arg0; }));

    auto arg1 = vm.argument(1);
    ResponseInit init = ResponseInit {};
    if (!arg1.is_undefined())
        init = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_response_init(vm, arg1); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return Fetch::Response::json(vm, data, init); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::type_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::type_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->type(); }));

    return JS::PrimitiveString::create(vm, idl_enum_to_string(R));
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::url_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::url_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->url(); }));

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::redirected_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::redirected_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->redirected(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::status_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::status_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->status(); }));

    return JS::Value(static_cast<WebIDL::UnsignedShort>(R));
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::ok_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::ok_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->ok(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::status_text_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::status_text_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->status_text(); }));

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::headers_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::headers_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->headers(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::body_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::body_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->body(); }));

    return [&]() -> JS::Value {
        // 1. If the IDL nullable type T? value is null, then the JavaScript value is null.
        if (!R)
            return JS::js_null();

        // 2. Otherwise, the JavaScript value is the result of converting the IDL nullable type value to the inner IDL type T.
        return JS::Value(JS::Value(R));
    }();
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::body_used_getter)
{
    WebIDL::log_trace(vm, "ResponsePrototype::body_used_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->body_used(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::clone)
{
    WebIDL::log_trace(vm, "ResponsePrototype::clone");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->clone(); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::array_buffer)
{
    WebIDL::log_trace(vm, "ResponsePrototype::array_buffer");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->array_buffer(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::blob)
{
    WebIDL::log_trace(vm, "ResponsePrototype::blob");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->blob(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::bytes)
{
    WebIDL::log_trace(vm, "ResponsePrototype::bytes");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->bytes(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::form_data)
{
    WebIDL::log_trace(vm, "ResponsePrototype::form_data");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->form_data(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::json)
{
    WebIDL::log_trace(vm, "ResponsePrototype::json");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->json(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

JS_DEFINE_NATIVE_FUNCTION(ResponsePrototype::text)
{
    WebIDL::log_trace(vm, "ResponsePrototype::text");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Fetch::Response* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->text(); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

// https://webidl.spec.whatwg.org/#idl-enumeration
JS::ThrowCompletionOr<ResponseType> convert_to_idl_value_for_response_type(JS::VM& vm, JS::Value value)
{
    // 1. Let S be the result of calling ? ToString(V).
    auto value_as_string = TRY(value.to_utf16_string(vm));

    // 2. If S is not one of E’s enumeration values, then throw a TypeError.
    // 3. Return the enumeration value of type E that is equal to S.
    if (value_as_string == "basic"sv)
        return ResponseType::Basic;
    if (value_as_string == "cors"sv)
        return ResponseType::Cors;
    if (value_as_string == "default"sv)
        return ResponseType::Default;
    if (value_as_string == "error"sv)
        return ResponseType::Error;
    if (value_as_string == "opaque"sv)
        return ResponseType::Opaque;
    if (value_as_string == "opaqueredirect"sv)
        return ResponseType::Opaqueredirect;
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, value_as_string, "ResponseType");
}

// https://webidl.spec.whatwg.org/#idl-enumeration
Utf16String idl_enum_to_string(ResponseType value)
{
    // The result of converting an IDL enumeration type value to a JavaScript value is the String value that represents the same sequence of code units as the enumeration value.
    switch (value) {
    case ResponseType::Basic:
        return "basic"_utf16;
    case ResponseType::Cors:
        return "cors"_utf16;
    case ResponseType::Default:
        return "default"_utf16;
    case ResponseType::Error:
        return "error"_utf16;
    case ResponseType::Opaque:
        return "opaque"_utf16;
    case ResponseType::Opaqueredirect:
        return "opaqueredirect"_utf16;
    }
    VERIFY_NOT_REACHED();
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<ResponseInit> convert_to_idl_value_for_response_init(JS::VM& vm, JS::Value js_dict)
{
    // 1. If jsDict is not an Object and jsDict is neither undefined nor null, then throw a TypeError.
    if (!js_dict.is_object() && !js_dict.is_nullish())
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "ResponseInit");

    // 2. Let idlDict be an empty ordered map, representing a dictionary of type D.
    // 3. Let dictionaries be a list consisting of D and all of D’s inherited dictionaries, in order from least to most derived.
    // 4. For each dictionary dictionary in dictionaries, in order:
    // NB: We defer construction until the return initializer because some members may not be default-constructible. Inherited dictionaries are represented by the generated C++ struct inheritance.

    // 5. Return idlDict.
    return ResponseInit {
        .headers = TRY([&]() -> JS::ThrowCompletionOr<Optional<Variant<Vector<Vector<String>>, OrderedHashMap<String, String>>>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("headers"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Variant<Vector<Vector<String>>, OrderedHashMap<String, String>>> {

        if (js_member_value.is_object()) {
            [[maybe_unused]] auto& object = js_member_value.as_object();

            // 1. Let method be ? GetMethod(V, @@iterator).
            auto method = TRY(js_member_value.get_method(vm, vm.well_known_symbol_iterator()));

            // 2. If method is not undefined, return the result of creating a sequence of that type from V and method.
            if (method) {
                auto sequence_union_type = TRY([&]() -> JS::ThrowCompletionOr<Vector<Vector<String>>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, js_member_value, *method));

        Vector<Vector<String>> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Vector<String>> {
        if (!next_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, next_value);

        auto method = TRY(next_value.get_method(vm, vm.well_known_symbol_iterator()));
        if (!method)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, next_value);

        return TRY([&]() -> JS::ThrowCompletionOr<Vector<String>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, next_value, *method));

        Vector<String> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_byte_string(vm, next_value));
    }(); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
    }(); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
                return Variant<Vector<Vector<String>>, OrderedHashMap<String, String>> { sequence_union_type };
            }


            auto record_union_type = TRY([&]() -> JS::ThrowCompletionOr<OrderedHashMap<String, String>> {
        // An ECMAScript value O is converted to an IDL record<K, V> value as follows:
        // 1. If Type(O) is not Object, throw a TypeError.
        if (!js_member_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, js_member_value);

        auto& record_object0 = js_member_value.as_object();

        // 2. Let result be a new empty instance of record<K, V>.
        OrderedHashMap<String, String> record;

        // 3. Let keys be ? O.[[OwnPropertyKeys]]().
        auto keys = TRY(record_object0.internal_own_property_keys());

        // 4. For each key of keys:
        for (auto& key : keys) {
            auto property_key = MUST(JS::PropertyKey::from_value(vm, key));

            // 1. Let desc be ? O.[[GetOwnProperty]](key).
            auto desc = TRY(record_object0.internal_get_own_property(property_key));

            // 2. If desc is not undefined and desc.[[Enumerable]] is true:
            if (!desc.has_value() || !desc->enumerable.has_value() || !desc->enumerable.value())
                continue;

            // 1. Let typedKey be key converted to an IDL value of type K.
            auto typed_key = TRY([&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_byte_string(vm, key));
    }());

            // 2. Let value be ? Get(O, key).
            auto value = TRY(record_object0.get(property_key));

            // 3. Let typedValue be value converted to an IDL value of type V.
            auto typed_value = TRY([&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_byte_string(vm, value));
    }());

            // 4. Set result[typedKey] to typedValue.
            record.set(typed_key, typed_value);
        }

        // 5. Return result.
        return record;
    }());
            return Variant<Vector<Vector<String>>, OrderedHashMap<String, String>> { record_union_type };
        }

        return vm.throw_completion<JS::TypeError>("No union types matched"_utf16);
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 7. Otherwise, jsMemberValue is undefined and the member is optional.
            return OptionalNone {};
        }()),
        .status = TRY([&]() -> JS::ThrowCompletionOr<WebIDL::UnsignedShort> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("status"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedShort>(vm, js_member_value, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = 200;

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .status_text = TRY([&]() -> JS::ThrowCompletionOr<String> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("statusText"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_byte_string(vm, js_member_value));
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = String {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
    };
}

} // namespace Web::Bindings