LibJS: Revert partial resizable ArrayBuffer implementation

This is a manual but clean revert of all commits from #12595.

Adding a partial implementation of the resizable ArrayBuffer proposal
without implementing all the updates to TypedArray infrastructure that
is also covered by the spec introduced a bunch of crashes, so we
decided to revert it for now until a full implementation is completed.

12 files changed, 10 insertions, 309 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
index 1c60b1f675..a8bc823207 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
@@ -1,6 +1,5 @@
 /*
  * Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
- * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -45,16 +44,6 @@ ArrayBuffer::ArrayBuffer(ByteBuffer* buffer, Object& prototype)
 {
 }
 
-// 1.1.5 IsResizableArrayBuffer ( arrayBuffer ), https://tc39.es/proposal-resizablearraybuffer/#sec-isresizablearraybuffer
-bool ArrayBuffer::is_resizable_array_buffer() const
-{
-    // 1. Assert: Type(arrayBuffer) is Object and arrayBuffer has an [[ArrayBufferData]] internal slot.
-
-    // 2. If buffer has an [[ArrayBufferMaxByteLength]] internal slot, return true.
-    // 3. Return false.
-    return m_max_byte_length.has_value();
-}
-
 void ArrayBuffer::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
@@ -62,38 +51,22 @@ void ArrayBuffer::visit_edges(Cell::Visitor& visitor)
 }
 
 // 25.1.2.1 AllocateArrayBuffer ( constructor, byteLength ), https://tc39.es/ecma262/#sec-allocatearraybuffer
-// 1.1.2 AllocateArrayBuffer ( constructor, byteLength [, maxByteLength ] ), https://tc39.es/proposal-resizablearraybuffer/#sec-allocatearraybuffer
-ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(GlobalObject& global_object, FunctionObject& constructor, size_t byte_length, Optional<size_t> max_byte_length)
+ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(GlobalObject& global_object, FunctionObject& constructor, size_t byte_length)
 {
-    // 1. Let slots be « [[ArrayBufferData]], [[ArrayBufferByteLength]], [[ArrayBufferDetachKey]] ».
-    // 2. If maxByteLength is present, append [[ArrayBufferMaxByteLength]] to slots.
-
-    // 3. Let obj be ? OrdinaryCreateFromConstructor(constructor, "%ArrayBuffer.prototype%", slots).
+    // 1. Let obj be ? OrdinaryCreateFromConstructor(constructor, "%ArrayBuffer.prototype%", « [[ArrayBufferData]], [[ArrayBufferByteLength]], [[ArrayBufferDetachKey]] »).
     auto* obj = TRY(ordinary_create_from_constructor<ArrayBuffer>(global_object, constructor, &GlobalObject::array_buffer_prototype, nullptr));
 
-    // 4. Let block be ? CreateByteDataBlock(byteLength).
+    // 2. Let block be ? CreateByteDataBlock(byteLength).
     auto block = ByteBuffer::create_zeroed(byte_length);
     if (block.is_error())
         return global_object.vm().throw_completion<RangeError>(global_object, ErrorType::NotEnoughMemoryToAllocate, byte_length);
 
-    // 5. Set obj.[[ArrayBufferData]] to block.
+    // 3. Set obj.[[ArrayBufferData]] to block.
     obj->set_buffer(block.release_value());
 
-    // 6. Set obj.[[ArrayBufferByteLength]] to byteLength.
-
-    // 7. If maxByteLength is present, then
-    if (max_byte_length.has_value()) {
-        // a. Assert: byteLength ≤ maxByteLength.
-        VERIFY(byte_length <= *max_byte_length);
-
-        // b. If it is not possible to create a Data Block block consisting of maxByteLength bytes, throw a RangeError exception.
-        // c. NOTE: Resizable ArrayBuffers are designed to be implementable with in-place growth. Implementations reserve the right to throw if, for example, virtual memory cannot be reserved up front.
-
-        // d. Set obj.[[ArrayBufferMaxByteLength]] to maxByteLength.
-        obj->set_max_byte_length(*max_byte_length);
-    }
+    // 4. Set obj.[[ArrayBufferByteLength]] to byteLength.
 
-    // 8. Return obj.
+    // 5. Return obj.
     return obj;
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.h b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.h
index 8cb6aae419..e8d17c3240 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.h
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.h
@@ -34,13 +34,11 @@ public:
     virtual ~ArrayBuffer() override = default;
 
     size_t byte_length() const { return buffer_impl().size(); }
-    size_t max_byte_length() const { return m_max_byte_length.value(); } // Will VERIFY() that it has value
     ByteBuffer& buffer() { return buffer_impl(); }
     ByteBuffer const& buffer() const { return buffer_impl(); }
 
     // Used by allocate_array_buffer() to attach the data block after construction
     void set_buffer(ByteBuffer buffer) { m_buffer = move(buffer); }
-    void set_max_byte_length(size_t max_byte_length) { m_max_byte_length = max_byte_length; }
 
     Value detach_key() const { return m_detach_key; }
     void set_detach_key(Value detach_key) { m_detach_key = detach_key; }
@@ -48,8 +46,6 @@ public:
     void detach_buffer() { m_buffer = Empty {}; }
     bool is_detached() const { return m_buffer.has<Empty>(); }
 
-    bool is_resizable_array_buffer() const;
-
     enum Order {
         SeqCst,
         Unordered
@@ -77,10 +73,9 @@ private:
     // The various detach related members of ArrayBuffer are not used by any ECMA262 functionality,
     // but are required to be available for the use of various harnesses like the Test262 test runner.
     Value m_detach_key;
-    Optional<size_t> m_max_byte_length;
 };
 
-ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(GlobalObject&, FunctionObject& constructor, size_t byte_length, Optional<size_t> max_byte_length = {});
+ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(GlobalObject&, FunctionObject& constructor, size_t byte_length);
 ThrowCompletionOr<void> detach_array_buffer(GlobalObject&, ArrayBuffer& array_buffer, Optional<Value> key = {});
 ThrowCompletionOr<ArrayBuffer*> clone_array_buffer(GlobalObject&, ArrayBuffer& source_buffer, size_t source_byte_offset, size_t source_length);
 
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp b/Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
index ac1e9f8500..2b9c6e2f55 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
@@ -1,6 +1,5 @@
 /*
  * Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
- * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -43,63 +42,21 @@ ThrowCompletionOr<Value> ArrayBufferConstructor::call()
     return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
 }
 
-// 1.1.6 GetArrayBufferMaxByteLengthOption ( options ), https://tc39.es/proposal-resizablearraybuffer/#sec-getarraybuffermaxbytelengthoption
-static ThrowCompletionOr<Optional<size_t>> get_array_buffer_max_byte_length_option(VM& vm, GlobalObject& global_object, Value options)
-{
-    // 1. If Type(options) is not Object, return empty.
-    if (!options.is_object())
-        return Optional<size_t>();
-
-    // 2. Let maxByteLength be ? Get(options, "maxByteLength").
-    auto max_byte_length = TRY(options.get(global_object, vm.names.maxByteLength));
-
-    // 3. If maxByteLength is undefined, return empty.
-    if (max_byte_length.is_undefined())
-        return Optional<size_t>();
-
-    // 4. Return ? ToIndex(maxByteLength).
-    return TRY(max_byte_length.to_index(global_object));
-}
-
 // 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
-// 1.2.1 ArrayBuffer ( length [, options ] ), https://tc39.es/proposal-resizablearraybuffer/#sec-arraybuffer-constructor
 ThrowCompletionOr<Object*> ArrayBufferConstructor::construct(FunctionObject& new_target)
 {
-    auto& global_object = this->global_object();
     auto& vm = this->vm();
+    auto byte_length_or_error = vm.argument(0).to_index(global_object());
 
-    // 1. If NewTarget is undefined, throw a TypeError exception.
-    // NOTE: See `ArrayBufferConstructor::call()`
-
-    // 2. Let byteLength be ? ToIndex(length).
-    auto byte_length_or_error = vm.argument(0).to_index(global_object);
     if (byte_length_or_error.is_error()) {
         auto error = byte_length_or_error.release_error();
         if (error.value()->is_object() && is<RangeError>(error.value()->as_object())) {
             // Re-throw more specific RangeError
-            return vm.throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "array buffer");
+            return vm.throw_completion<RangeError>(global_object(), ErrorType::InvalidLength, "array buffer");
         }
         return error;
     }
-    auto byte_length = byte_length_or_error.release_value();
-
-    // 3. Let requestedMaxByteLength be ? GetArrayBufferMaxByteLengthOption(options).
-    auto options = vm.argument(1);
-    auto requested_max_byte_length_value = TRY(get_array_buffer_max_byte_length_option(vm, global_object, options));
-
-    // 4. If requestedMaxByteLength is empty, then
-    if (!requested_max_byte_length_value.has_value()) {
-        // a. Return ? AllocateArrayBuffer(NewTarget, byteLength).
-        return TRY(allocate_array_buffer(global_object, new_target, byte_length));
-    }
-    auto requested_max_byte_length = requested_max_byte_length_value.release_value();
-
-    // 5. If byteLength > requestedMaxByteLength, throw a RangeError exception.
-    if (byte_length > requested_max_byte_length)
-        return vm.throw_completion<RangeError>(global_object, ErrorType::ByteLengthBeyondRequestedMax);
-
-    // 6. Return ? AllocateArrayBuffer(NewTarget, byteLength, requestedMaxByteLength).
-    return TRY(allocate_array_buffer(global_object, new_target, byte_length, requested_max_byte_length));
+    return TRY(allocate_array_buffer(global_object(), new_target, byte_length_or_error.release_value()));
 }
 
 // 25.1.4.1 ArrayBuffer.isView ( arg ), https://tc39.es/ecma262/#sec-arraybuffer.isview
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
index 5d19401e30..463d944c48 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
@@ -2,7 +2,6 @@
  * Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
  * Copyright (c) 2021-2022, Jamie Mansfield <jmansfield@cadixdev.org>
  * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
- * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -26,10 +25,7 @@ void ArrayBufferPrototype::initialize(GlobalObject& global_object)
     Object::initialize(global_object);
     u8 attr = Attribute::Writable | Attribute::Configurable;
     define_native_function(vm.names.slice, slice, 2, attr);
-    define_native_function(vm.names.resize, resize, 1, attr);
     define_native_accessor(vm.names.byteLength, byte_length_getter, {}, Attribute::Configurable);
-    define_native_accessor(vm.names.maxByteLength, max_byte_length_getter, {}, Attribute::Configurable);
-    define_native_accessor(vm.names.resizable, resizable_getter, {}, Attribute::Configurable);
 
     // 25.1.5.4 ArrayBuffer.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-arraybuffer.prototype-@@tostringtag
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm, vm.names.ArrayBuffer.as_string()), Attribute::Configurable);
@@ -124,60 +120,6 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::slice)
     return new_array_buffer_object;
 }
 
-// 1.3.5 ArrayBuffer.prototype.resize ( newLength ), https://tc39.es/proposal-resizablearraybuffer/#sec-arraybuffer.prototype.resize
-JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::resize)
-{
-    // 1. Let O be the this value.
-    auto* array_buffer_object = TRY(typed_this_value(global_object));
-
-    // 2. Perform ? RequireInternalSlot(O, [[ArrayBufferMaxByteLength]]).
-    if (!array_buffer_object->is_resizable_array_buffer())
-        return vm.throw_completion<TypeError>(global_object, ErrorType::NotAResizableArrayBuffer);
-
-    // 3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
-    // FIXME: Check for shared buffer
-
-    // 4. If IsDetachedBuffer(O) is true, throw a TypeError exception.
-    if (array_buffer_object->is_detached())
-        return vm.throw_completion<TypeError>(global_object, ErrorType::DetachedArrayBuffer);
-
-    // 5. Let newByteLength be ? ToIntegerOrInfinity(newLength).
-    auto new_byte_length = TRY(vm.argument(0).to_integer_or_infinity(global_object));
-
-    // 6. If newByteLength < 0 or newByteLength > O.[[ArrayBufferMaxByteLength]], throw a RangeError exception.
-    if (new_byte_length < 0 || new_byte_length > array_buffer_object->max_byte_length())
-        return vm.throw_completion<RangeError>(global_object, ErrorType::NewByteLengthOutOfRange);
-
-    // 7. Let hostHandled be ? HostResizeArrayBuffer(O, newByteLength).
-    auto host_handled = TRY(vm.host_resize_array_buffer(global_object, (size_t)new_byte_length));
-
-    // 8. If hostHandled is handled, return undefined.
-    if (host_handled == VM::HostResizeArrayBufferResult::Handled)
-        return js_undefined();
-
-    // 9. Let oldBlock be O.[[ArrayBufferData]].
-    // 10. Let newBlock be ? CreateByteDataBlock(newByteLength).
-    // 11. Let copyLength be min(newByteLength, O.[[ArrayBufferByteLength]]).
-    // 12. Perform CopyDataBlockBytes(newBlock, 0, oldBlock, 0, copyLength).
-    // 13. NOTE: Neither creation of the new Data Block nor copying from the old Data Block are observable. Implementations reserve the right to implement this method as in-place growth or shrinkage.
-    // 14. Set O.[[ArrayBufferData]] to newBlock.
-    auto old_byte_length = array_buffer_object->byte_length();
-    if (array_buffer_object->buffer().try_resize((size_t)new_byte_length).is_error())
-        return global_object.vm().throw_completion<RangeError>(global_object, ErrorType::NotEnoughMemoryToAllocate, new_byte_length);
-
-    // Resizing an `AK::ByteBuffer` does not zero initialize any new capacity, but we want it to be anyway
-    if (new_byte_length > old_byte_length) {
-        // This performs bounds checking whereas a raw `memset` call would not be
-        array_buffer_object->buffer().bytes().slice(old_byte_length).fill(0);
-    }
-
-    // 15. Set O.[[ArrayBufferByteLength]] to newLength.
-    // This value is managed by the `AK::ByteBuffer` internally, it already has its new value
-
-    // 16. Return undefined.
-    return js_undefined();
-}
-
 // 25.1.5.1 get ArrayBuffer.prototype.byteLength, https://tc39.es/ecma262/#sec-get-arraybuffer.prototype.bytelength
 JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::byte_length_getter)
 {
@@ -199,44 +141,4 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::byte_length_getter)
     return Value(length);
 }
 
-// 1.3.2 get ArrayBuffer.prototype.maxByteLength, https://tc39.es/proposal-resizablearraybuffer/#sec-get-arraybuffer.prototype.maxbytelength
-JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::max_byte_length_getter)
-{
-    // 1. Let O be the this value.
-    // 2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]).
-    auto* array_buffer_object = TRY(typed_this_value(global_object));
-
-    // 3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
-    // FIXME: Check for shared buffer
-
-    // 4. If IsDetachedBuffer(O) is true, return +0𝔽.
-    if (array_buffer_object->is_detached())
-        return Value(0);
-
-    // 5. If IsResizableArrayBuffer(O) is true, then
-    if (array_buffer_object->is_resizable_array_buffer()) {
-        // a. Let length be O.[[ArrayBufferMaxByteLength]].
-        return array_buffer_object->max_byte_length();
-    }
-
-    // 6. Else
-    //     a. Let length be O.[[ArrayBufferByteLength]].
-    // 7. Return 𝔽(length).
-    return array_buffer_object->byte_length();
-}
-
-// 1.3.3 get ArrayBuffer.prototype.resizable, https://tc39.es/proposal-resizablearraybuffer/#sec-get-arraybuffer.prototype.resizable
-JS_DEFINE_NATIVE_FUNCTION(ArrayBufferPrototype::resizable_getter)
-{
-    // 1. Let O be the this value.
-    // 2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]).
-    auto* array_buffer_object = TRY(typed_this_value(global_object));
-
-    // 3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
-    // FIXME: Check for shared buffer
-
-    // 4. Return IsResizableArrayBuffer(O).
-    return array_buffer_object->is_resizable_array_buffer();
-}
-
 }
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.h b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.h
index 6e427f4238..2baae73737 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.h
@@ -21,10 +21,7 @@ public:
 
 private:
     JS_DECLARE_NATIVE_FUNCTION(slice);
-    JS_DECLARE_NATIVE_FUNCTION(resize);
     JS_DECLARE_NATIVE_FUNCTION(byte_length_getter);
-    JS_DECLARE_NATIVE_FUNCTION(max_byte_length_getter);
-    JS_DECLARE_NATIVE_FUNCTION(resizable_getter);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
index 64098d67f3..5b9bf6d7b0 100644
--- a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
+++ b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
@@ -316,7 +316,6 @@ namespace JS {
     P(log10)                                 \
     P(map)                                   \
     P(max)                                   \
-    P(maxByteLength)                         \
     P(maximize)                              \
     P(mergeFields)                           \
     P(message)                               \
@@ -388,8 +387,6 @@ namespace JS {
     P(reject)                                \
     P(relativeTo)                            \
     P(repeat)                                \
-    P(resize)                                \
-    P(resizable)                             \
     P(resolve)                               \
     P(resolvedOptions)                       \
     P(reverse)                               \
diff --git a/Userland/Libraries/LibJS/Runtime/ErrorTypes.h b/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
index c7434c5af8..bb9698990e 100644
--- a/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
+++ b/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
@@ -15,7 +15,6 @@
     M(BigIntFromNonIntegral, "Cannot convert non-integral number to BigInt")                                                            \
     M(BigIntInvalidValue, "Invalid value for BigInt: {}")                                                                               \
     M(BindingNotInitialized, "Binding {} is not initialized")                                                                           \
-    M(ByteLengthBeyondRequestedMax, "Byte length exceeds maxByteLength option")                                                         \
     M(CallStackSizeExceeded, "Call stack size limit exceeded")                                                                          \
     M(CannotDeclareGlobalFunction, "Cannot declare global function of name '{}'")                                                       \
     M(CannotDeclareGlobalVariable, "Cannot declare global variable of name '{}'")                                                       \
@@ -79,7 +78,6 @@
     M(ModuleNotFound, "Cannot find/open module: '{}'")                                                                                  \
     M(ModuleNotFoundNoReferencingScript, "Cannot resolve module {} without any active script or module")                                \
     M(NegativeExponent, "Exponent must be positive")                                                                                    \
-    M(NewByteLengthOutOfRange, "New byte length outside range supported by ArrayBuffer instance")                                       \
     M(NonExtensibleDefine, "Cannot define property {} on non-extensible object")                                                        \
     M(NotAConstructor, "{} is not a constructor")                                                                                       \
     M(NotAFunction, "{} is not a function")                                                                                             \
@@ -88,7 +86,6 @@
     M(NotAnObjectOfType, "Not an object of type {}")                                                                                    \
     M(NotAnObjectOrNull, "{} is neither an object nor null")                                                                            \
     M(NotAnObjectOrString, "{} is neither an object nor a string")                                                                      \
-    M(NotAResizableArrayBuffer, "ArrayBuffer instance not resizable")                                                                   \
     M(NotAString, "{} is not a string")                                                                                                 \
     M(NotASymbol, "{} is not a symbol")                                                                                                 \
     M(NotImplemented, "TODO({} is not implemented in LibJS)")                                                                           \
diff --git a/Userland/Libraries/LibJS/Runtime/VM.cpp b/Userland/Libraries/LibJS/Runtime/VM.cpp
index 466bc8c7a8..193c01d25f 100644
--- a/Userland/Libraries/LibJS/Runtime/VM.cpp
+++ b/Userland/Libraries/LibJS/Runtime/VM.cpp
@@ -14,7 +14,6 @@
 #include <LibJS/Interpreter.h>
 #include <LibJS/Runtime/AbstractOperations.h>
 #include <LibJS/Runtime/Array.h>
-#include <LibJS/Runtime/ArrayBuffer.h>
 #include <LibJS/Runtime/BoundFunction.h>
 #include <LibJS/Runtime/Completion.h>
 #include <LibJS/Runtime/ECMAScriptFunctionObject.h>
@@ -114,23 +113,6 @@ VM::VM(OwnPtr<CustomData> custom_data)
         return Vector<String> { "type" };
     };
 
-    // 1.1.7 HostResizeArrayBuffer ( buffer, newByteLength ), https://tc39.es/proposal-resizablearraybuffer/#sec-hostresizearraybuffer
-    host_resize_array_buffer = [](GlobalObject& global_object, size_t new_byte_length) {
-        // The host-defined abstract operation HostResizeArrayBuffer takes arguments buffer (an ArrayBuffer) and newByteLength (a non-negative integer).
-        // The host-defined abstract operation HostResizeArrayBuffer takes arguments buffer (an ArrayBuffer object) and newByteLength.
-        // It gives the host an opportunity to perform implementation-defined resizing of buffer. If the host chooses not to handle resizing of buffer, it may return unhandled for the default behavior.
-        // The implementation of HostResizeArrayBuffer must conform to the following requirements:
-        //   * The abstract operation must return either NormalCompletion(handled), NormalCompletion(unhandled), or an abrupt throw completion.
-        //   * The abstract operation does not detach buffer.
-        //   * If the abstract operation completes normally with handled, buffer.[[ArrayBufferByteLength]] is newByteLength.
-        // The default implementation of HostResizeArrayBuffer is to return unhandled.
-
-        (void)global_object;
-        (void)new_byte_length;
-
-        return HostResizeArrayBufferResult::Unhandled;
-    };
-
     // 19.2.1.2 HostEnsureCanCompileStrings ( callerRealm, calleeRealm ), https://tc39.es/ecma262/#sec-hostensurecancompilestrings
     host_ensure_can_compile_strings = [](Realm&) -> ThrowCompletionOr<void> {
         // The host-defined abstract operation HostEnsureCanCompileStrings takes argument calleeRealm (a Realm Record)
diff --git a/Userland/Libraries/LibJS/Runtime/VM.h b/Userland/Libraries/LibJS/Runtime/VM.h
index cd882c6b07..4f7dc2b8db 100644
--- a/Userland/Libraries/LibJS/Runtime/VM.h
+++ b/Userland/Libraries/LibJS/Runtime/VM.h
@@ -39,11 +39,6 @@ public:
     static NonnullRefPtr<VM> create(OwnPtr<CustomData> = {});
     ~VM() = default;
 
-    enum class HostResizeArrayBufferResult {
-        Unhandled,
-        Handled,
-    };
-
     Heap& heap() { return m_heap; }
     Heap const& heap() const { return m_heap; }
 
@@ -233,7 +228,6 @@ public:
     Function<void(FinalizationRegistry&)> host_enqueue_finalization_registry_cleanup_job;
     Function<void(Function<ThrowCompletionOr<Value>()>, Realm*)> host_enqueue_promise_job;
     Function<JobCallback(FunctionObject&)> host_make_job_callback;
-    Function<ThrowCompletionOr<HostResizeArrayBufferResult>(GlobalObject&, size_t)> host_resize_array_buffer;
     Function<ThrowCompletionOr<void>(Realm&)> host_ensure_can_compile_strings;
 
 private:
diff --git a/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.js b/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.js
index 193d2e47aa..8fb05a250c 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.js
@@ -11,57 +11,3 @@ test("ArrayBuffer constructor must be invoked with 'new'", () => {
         ArrayBuffer();
     }).toThrowWithMessage(TypeError, "ArrayBuffer constructor must be called with 'new'");
 });
-
-describe("resizable array buffer", () => {
-    test("construct with options", () => {
-        expect(new ArrayBuffer(5, { maxByteLength: 5 })).toBeInstanceOf(ArrayBuffer);
-    });
-
-    test("resizable when provided max byte length", () => {
-        expect(new ArrayBuffer(1).resizable).toEqual(false);
-        expect(new ArrayBuffer(1, {}).resizable).toEqual(false);
-        expect(new ArrayBuffer(1, { maxByteLength: undefined }).resizable).toEqual(false);
-        expect(new ArrayBuffer(1, { maxByteLength: 1 }).resizable).toEqual(true);
-    });
-
-    test("byte length must be shorter than max byte length", () => {
-        expect(() => {
-            new ArrayBuffer(1, { maxByteLength: 0 });
-        }).toThrowWithMessage(RangeError, "Byte length exceeds maxByteLength option");
-    });
-
-    test("max byte length cannot be too large", () => {
-        expect(() => {
-            new ArrayBuffer(0, { maxByteLength: 9007199254740992 });
-        }).toThrowWithMessage(RangeError, "Index must be a positive integer");
-    });
-
-    test("max byte length cannot be negative", () => {
-        expect(() => {
-            new ArrayBuffer(0, { maxByteLength: -1 });
-        }).toThrowWithMessage(RangeError, "Index must be a positive integer");
-    });
-
-    test("invalid max byte length object", () => {
-        expect(() => {
-            new ArrayBuffer(0, {
-                maxByteLength: {
-                    toString: function () {
-                        return {};
-                    },
-                    valueOf: function () {
-                        return {};
-                    },
-                },
-            });
-        }).toThrowWithMessage(TypeError, "Cannot convert object to number");
-
-        expect(() => {
-            new ArrayBuffer(0, {
-                get maxByteLength() {
-                    throw "Exception";
-                },
-            });
-        }).toThrow();
-    });
-});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.prototype.resize.js b/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.prototype.resize.js
deleted file mode 100644
index e8b67f16bc..0000000000
--- a/Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.prototype.resize.js
+++ /dev/null
@@ -1,35 +0,0 @@
-test("length is 1", () => {
-    expect(ArrayBuffer.prototype.resize).toHaveLength(1);
-});
-
-test("resize up to max", () => {
-    let a = new ArrayBuffer(0, { maxByteLength: 10 });
-    a.resize(10);
-    expect(a.byteLength).toEqual(10);
-});
-
-test("resize less than max", () => {
-    let a = new ArrayBuffer(10, { maxByteLength: 10 });
-    a.resize(5);
-    expect(a.byteLength).toEqual(5);
-});
-
-test("resize with negative length", () => {
-    let a = new ArrayBuffer(10, { maxByteLength: 10 });
-    expect(() => {
-        a.resize(-1);
-    }).toThrowWithMessage(
-        RangeError,
-        "New byte length outside range supported by ArrayBuffer instance"
-    );
-});
-
-test("resize past max length", () => {
-    let a = new ArrayBuffer(10, { maxByteLength: 10 });
-    expect(() => {
-        a.resize(11);
-    }).toThrowWithMessage(
-        RangeError,
-        "New byte length outside range supported by ArrayBuffer instance"
-    );
-});
diff --git a/Userland/Utilities/js.cpp b/Userland/Utilities/js.cpp
index f4a4e04ed2..22ad20c771 100644
--- a/Userland/Utilities/js.cpp
+++ b/Userland/Utilities/js.cpp
@@ -469,10 +469,6 @@ static void print_array_buffer(JS::ArrayBuffer const& array_buffer, HashTable<JS
     print_type("ArrayBuffer");
     js_out("\n  byteLength: ");
     print_value(JS::Value((double)byte_length), seen_objects);
-    if (array_buffer.is_resizable_array_buffer()) {
-        js_out("\n  maxByteLength: ");
-        print_value(JS::Value((double)array_buffer.max_byte_length()), seen_objects);
-    }
     if (!byte_length)
         return;
     js_outln();