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diff --git a/deps/v8/include/v8-value.h b/deps/v8/include/v8-value.h
new file mode 100644
index 0000000000..adca989e00
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+++ b/deps/v8/include/v8-value.h
@@ -0,0 +1,526 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_VALUE_H_
+#define INCLUDE_V8_VALUE_H_
+
+#include "v8-data.h"          // NOLINT(build/include_directory)
+#include "v8-internal.h"      // NOLINT(build/include_directory)
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8-maybe.h"         // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+/**
+ * The v8 JavaScript engine.
+ */
+namespace v8 {
+
+class BigInt;
+class Int32;
+class Integer;
+class Number;
+class Object;
+class String;
+class Uint32;
+
+/**
+ * The superclass of all JavaScript values and objects.
+ */
+class V8_EXPORT Value : public Data {
+ public:
+  /**
+   * Returns true if this value is the undefined value.  See ECMA-262
+   * 4.3.10.
+   *
+   * This is equivalent to `value === undefined` in JS.
+   */
+  V8_INLINE bool IsUndefined() const;
+
+  /**
+   * Returns true if this value is the null value.  See ECMA-262
+   * 4.3.11.
+   *
+   * This is equivalent to `value === null` in JS.
+   */
+  V8_INLINE bool IsNull() const;
+
+  /**
+   * Returns true if this value is either the null or the undefined value.
+   * See ECMA-262
+   * 4.3.11. and 4.3.12
+   *
+   * This is equivalent to `value == null` in JS.
+   */
+  V8_INLINE bool IsNullOrUndefined() const;
+
+  /**
+   * Returns true if this value is true.
+   *
+   * This is not the same as `BooleanValue()`. The latter performs a
+   * conversion to boolean, i.e. the result of `Boolean(value)` in JS, whereas
+   * this checks `value === true`.
+   */
+  bool IsTrue() const;
+
+  /**
+   * Returns true if this value is false.
+   *
+   * This is not the same as `!BooleanValue()`. The latter performs a
+   * conversion to boolean, i.e. the result of `!Boolean(value)` in JS, whereas
+   * this checks `value === false`.
+   */
+  bool IsFalse() const;
+
+  /**
+   * Returns true if this value is a symbol or a string.
+   *
+   * This is equivalent to
+   * `typeof value === 'string' || typeof value === 'symbol'` in JS.
+   */
+  bool IsName() const;
+
+  /**
+   * Returns true if this value is an instance of the String type.
+   * See ECMA-262 8.4.
+   *
+   * This is equivalent to `typeof value === 'string'` in JS.
+   */
+  V8_INLINE bool IsString() const;
+
+  /**
+   * Returns true if this value is a symbol.
+   *
+   * This is equivalent to `typeof value === 'symbol'` in JS.
+   */
+  bool IsSymbol() const;
+
+  /**
+   * Returns true if this value is a function.
+   *
+   * This is equivalent to `typeof value === 'function'` in JS.
+   */
+  bool IsFunction() const;
+
+  /**
+   * Returns true if this value is an array. Note that it will return false for
+   * an Proxy for an array.
+   */
+  bool IsArray() const;
+
+  /**
+   * Returns true if this value is an object.
+   */
+  bool IsObject() const;
+
+  /**
+   * Returns true if this value is a bigint.
+   *
+   * This is equivalent to `typeof value === 'bigint'` in JS.
+   */
+  bool IsBigInt() const;
+
+  /**
+   * Returns true if this value is boolean.
+   *
+   * This is equivalent to `typeof value === 'boolean'` in JS.
+   */
+  bool IsBoolean() const;
+
+  /**
+   * Returns true if this value is a number.
+   *
+   * This is equivalent to `typeof value === 'number'` in JS.
+   */
+  bool IsNumber() const;
+
+  /**
+   * Returns true if this value is an `External` object.
+   */
+  bool IsExternal() const;
+
+  /**
+   * Returns true if this value is a 32-bit signed integer.
+   */
+  bool IsInt32() const;
+
+  /**
+   * Returns true if this value is a 32-bit unsigned integer.
+   */
+  bool IsUint32() const;
+
+  /**
+   * Returns true if this value is a Date.
+   */
+  bool IsDate() const;
+
+  /**
+   * Returns true if this value is an Arguments object.
+   */
+  bool IsArgumentsObject() const;
+
+  /**
+   * Returns true if this value is a BigInt object.
+   */
+  bool IsBigIntObject() const;
+
+  /**
+   * Returns true if this value is a Boolean object.
+   */
+  bool IsBooleanObject() const;
+
+  /**
+   * Returns true if this value is a Number object.
+   */
+  bool IsNumberObject() const;
+
+  /**
+   * Returns true if this value is a String object.
+   */
+  bool IsStringObject() const;
+
+  /**
+   * Returns true if this value is a Symbol object.
+   */
+  bool IsSymbolObject() const;
+
+  /**
+   * Returns true if this value is a NativeError.
+   */
+  bool IsNativeError() const;
+
+  /**
+   * Returns true if this value is a RegExp.
+   */
+  bool IsRegExp() const;
+
+  /**
+   * Returns true if this value is an async function.
+   */
+  bool IsAsyncFunction() const;
+
+  /**
+   * Returns true if this value is a Generator function.
+   */
+  bool IsGeneratorFunction() const;
+
+  /**
+   * Returns true if this value is a Generator object (iterator).
+   */
+  bool IsGeneratorObject() const;
+
+  /**
+   * Returns true if this value is a Promise.
+   */
+  bool IsPromise() const;
+
+  /**
+   * Returns true if this value is a Map.
+   */
+  bool IsMap() const;
+
+  /**
+   * Returns true if this value is a Set.
+   */
+  bool IsSet() const;
+
+  /**
+   * Returns true if this value is a Map Iterator.
+   */
+  bool IsMapIterator() const;
+
+  /**
+   * Returns true if this value is a Set Iterator.
+   */
+  bool IsSetIterator() const;
+
+  /**
+   * Returns true if this value is a WeakMap.
+   */
+  bool IsWeakMap() const;
+
+  /**
+   * Returns true if this value is a WeakSet.
+   */
+  bool IsWeakSet() const;
+
+  /**
+   * Returns true if this value is an ArrayBuffer.
+   */
+  bool IsArrayBuffer() const;
+
+  /**
+   * Returns true if this value is an ArrayBufferView.
+   */
+  bool IsArrayBufferView() const;
+
+  /**
+   * Returns true if this value is one of TypedArrays.
+   */
+  bool IsTypedArray() const;
+
+  /**
+   * Returns true if this value is an Uint8Array.
+   */
+  bool IsUint8Array() const;
+
+  /**
+   * Returns true if this value is an Uint8ClampedArray.
+   */
+  bool IsUint8ClampedArray() const;
+
+  /**
+   * Returns true if this value is an Int8Array.
+   */
+  bool IsInt8Array() const;
+
+  /**
+   * Returns true if this value is an Uint16Array.
+   */
+  bool IsUint16Array() const;
+
+  /**
+   * Returns true if this value is an Int16Array.
+   */
+  bool IsInt16Array() const;
+
+  /**
+   * Returns true if this value is an Uint32Array.
+   */
+  bool IsUint32Array() const;
+
+  /**
+   * Returns true if this value is an Int32Array.
+   */
+  bool IsInt32Array() const;
+
+  /**
+   * Returns true if this value is a Float32Array.
+   */
+  bool IsFloat32Array() const;
+
+  /**
+   * Returns true if this value is a Float64Array.
+   */
+  bool IsFloat64Array() const;
+
+  /**
+   * Returns true if this value is a BigInt64Array.
+   */
+  bool IsBigInt64Array() const;
+
+  /**
+   * Returns true if this value is a BigUint64Array.
+   */
+  bool IsBigUint64Array() const;
+
+  /**
+   * Returns true if this value is a DataView.
+   */
+  bool IsDataView() const;
+
+  /**
+   * Returns true if this value is a SharedArrayBuffer.
+   */
+  bool IsSharedArrayBuffer() const;
+
+  /**
+   * Returns true if this value is a JavaScript Proxy.
+   */
+  bool IsProxy() const;
+
+  /**
+   * Returns true if this value is a WasmMemoryObject.
+   */
+  bool IsWasmMemoryObject() const;
+
+  /**
+   * Returns true if this value is a WasmModuleObject.
+   */
+  bool IsWasmModuleObject() const;
+
+  /**
+   * Returns true if the value is a Module Namespace Object.
+   */
+  bool IsModuleNamespaceObject() const;
+
+  /**
+   * Perform the equivalent of `BigInt(value)` in JS.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<BigInt> ToBigInt(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `Number(value)` in JS.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Number> ToNumber(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `String(value)` in JS.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<String> ToString(
+      Local<Context> context) const;
+  /**
+   * Provide a string representation of this value usable for debugging.
+   * This operation has no observable side effects and will succeed
+   * unless e.g. execution is being terminated.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<String> ToDetailString(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `Object(value)` in JS.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Object> ToObject(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `Number(value)` in JS and convert the result
+   * to an integer. Negative values are rounded up, positive values are rounded
+   * down. NaN is converted to 0. Infinite values yield undefined results.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Integer> ToInteger(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `Number(value)` in JS and convert the result
+   * to an unsigned 32-bit integer by performing the steps in
+   * https://tc39.es/ecma262/#sec-touint32.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Uint32> ToUint32(
+      Local<Context> context) const;
+  /**
+   * Perform the equivalent of `Number(value)` in JS and convert the result
+   * to a signed 32-bit integer by performing the steps in
+   * https://tc39.es/ecma262/#sec-toint32.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Int32> ToInt32(Local<Context> context) const;
+
+  /**
+   * Perform the equivalent of `Boolean(value)` in JS. This can never fail.
+   */
+  Local<Boolean> ToBoolean(Isolate* isolate) const;
+
+  /**
+   * Attempts to convert a string to an array index.
+   * Returns an empty handle if the conversion fails.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Uint32> ToArrayIndex(
+      Local<Context> context) const;
+
+  /** Returns the equivalent of `ToBoolean()->Value()`. */
+  bool BooleanValue(Isolate* isolate) const;
+
+  /** Returns the equivalent of `ToNumber()->Value()`. */
+  V8_WARN_UNUSED_RESULT Maybe<double> NumberValue(Local<Context> context) const;
+  /** Returns the equivalent of `ToInteger()->Value()`. */
+  V8_WARN_UNUSED_RESULT Maybe<int64_t> IntegerValue(
+      Local<Context> context) const;
+  /** Returns the equivalent of `ToUint32()->Value()`. */
+  V8_WARN_UNUSED_RESULT Maybe<uint32_t> Uint32Value(
+      Local<Context> context) const;
+  /** Returns the equivalent of `ToInt32()->Value()`. */
+  V8_WARN_UNUSED_RESULT Maybe<int32_t> Int32Value(Local<Context> context) const;
+
+  /** JS == */
+  V8_WARN_UNUSED_RESULT Maybe<bool> Equals(Local<Context> context,
+                                           Local<Value> that) const;
+  bool StrictEquals(Local<Value> that) const;
+  bool SameValue(Local<Value> that) const;
+
+  template <class T>
+  V8_INLINE static Value* Cast(T* value) {
+    return static_cast<Value*>(value);
+  }
+
+  Local<String> TypeOf(Isolate*);
+
+  Maybe<bool> InstanceOf(Local<Context> context, Local<Object> object);
+
+ private:
+  V8_INLINE bool QuickIsUndefined() const;
+  V8_INLINE bool QuickIsNull() const;
+  V8_INLINE bool QuickIsNullOrUndefined() const;
+  V8_INLINE bool QuickIsString() const;
+  bool FullIsUndefined() const;
+  bool FullIsNull() const;
+  bool FullIsString() const;
+
+  static void CheckCast(Data* that);
+};
+
+template <>
+V8_INLINE Value* Value::Cast(Data* value) {
+#ifdef V8_ENABLE_CHECKS
+  CheckCast(value);
+#endif
+  return static_cast<Value*>(value);
+}
+
+bool Value::IsUndefined() const {
+#ifdef V8_ENABLE_CHECKS
+  return FullIsUndefined();
+#else
+  return QuickIsUndefined();
+#endif
+}
+
+bool Value::QuickIsUndefined() const {
+  using A = internal::Address;
+  using I = internal::Internals;
+  A obj = *reinterpret_cast<const A*>(this);
+  if (!I::HasHeapObjectTag(obj)) return false;
+  if (I::GetInstanceType(obj) != I::kOddballType) return false;
+  return (I::GetOddballKind(obj) == I::kUndefinedOddballKind);
+}
+
+bool Value::IsNull() const {
+#ifdef V8_ENABLE_CHECKS
+  return FullIsNull();
+#else
+  return QuickIsNull();
+#endif
+}
+
+bool Value::QuickIsNull() const {
+  using A = internal::Address;
+  using I = internal::Internals;
+  A obj = *reinterpret_cast<const A*>(this);
+  if (!I::HasHeapObjectTag(obj)) return false;
+  if (I::GetInstanceType(obj) != I::kOddballType) return false;
+  return (I::GetOddballKind(obj) == I::kNullOddballKind);
+}
+
+bool Value::IsNullOrUndefined() const {
+#ifdef V8_ENABLE_CHECKS
+  return FullIsNull() || FullIsUndefined();
+#else
+  return QuickIsNullOrUndefined();
+#endif
+}
+
+bool Value::QuickIsNullOrUndefined() const {
+  using A = internal::Address;
+  using I = internal::Internals;
+  A obj = *reinterpret_cast<const A*>(this);
+  if (!I::HasHeapObjectTag(obj)) return false;
+  if (I::GetInstanceType(obj) != I::kOddballType) return false;
+  int kind = I::GetOddballKind(obj);
+  return kind == I::kNullOddballKind || kind == I::kUndefinedOddballKind;
+}
+
+bool Value::IsString() const {
+#ifdef V8_ENABLE_CHECKS
+  return FullIsString();
+#else
+  return QuickIsString();
+#endif
+}
+
+bool Value::QuickIsString() const {
+  using A = internal::Address;
+  using I = internal::Internals;
+  A obj = *reinterpret_cast<const A*>(this);
+  if (!I::HasHeapObjectTag(obj)) return false;
+  return (I::GetInstanceType(obj) < I::kFirstNonstringType);
+}
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_VALUE_H_