internal static extern JavaScriptErrorCode JsGetOwnPropertyDescriptor(JavaScriptValue obj, JavaScriptPropertyId propertyId, out JavaScriptValue propertyDescriptor);

 internal static extern JavaScriptErrorCode JsVariantToValue([MarshalAs(UnmanagedType.Struct)] ref object var, out JavaScriptValue value);

 /// <summary>
 /// Initializes a new instance of the <see cref="JavaScriptScriptException"/> class.
 /// </summary>
 /// <param name="code">The error code returned.</param>
 /// <param name="error">The JavaScript error object.</param>
 public JavaScriptScriptException(JavaScriptErrorCode code, JavaScriptValue error)
     : this(code, error, "JavaScript Exception")
 {
 }

 internal static extern JavaScriptErrorCode JsSetPrototype(JavaScriptValue obj, JavaScriptValue prototypeObject);

 internal static extern JavaScriptErrorCode JsStringToPointer(JavaScriptValue value, out IntPtr stringValue, out UIntPtr stringLength);

 internal static extern JavaScriptErrorCode JsSetException(JavaScriptValue exception);

 internal static extern JavaScriptErrorCode JsSetIndexedProperty(JavaScriptValue obj, JavaScriptValue index, JavaScriptValue value);

 internal static extern JavaScriptErrorCode JsGetValueType(JavaScriptValue value, out JavaScriptValueType type);

 internal static extern JavaScriptErrorCode JsHasExternalData(JavaScriptValue obj, out bool value);

 internal static extern JavaScriptErrorCode JsGetTrueValue(out JavaScriptValue trueValue);

 internal static extern JavaScriptErrorCode JsGetUndefinedValue(out JavaScriptValue undefinedValue);

 internal static extern JavaScriptErrorCode JsGetStringLength(JavaScriptValue sringValue, out int length);

 internal static extern JavaScriptErrorCode JsGetProperty(JavaScriptValue obj, JavaScriptPropertyId propertyId, out JavaScriptValue value);

 internal static extern JavaScriptErrorCode JsGetOwnPropertyNames(JavaScriptValue obj, out JavaScriptValue propertyNames);

 internal static extern JavaScriptErrorCode JsRunScript(string script, JavaScriptSourceContext sourceContext, string sourceUrl, out JavaScriptValue result);

 internal static extern JavaScriptErrorCode JsHasIndexedProperty(JavaScriptValue obj, JavaScriptValue index, out bool result);

 internal static extern JavaScriptErrorCode JsRunSerializedScript(string script, byte[] buffer, JavaScriptSourceContext sourceContext, string sourceUrl, out JavaScriptValue result);

 internal static extern JavaScriptErrorCode JsHasProperty(JavaScriptValue obj, JavaScriptPropertyId propertyId, out bool hasProperty);

 internal static extern JavaScriptErrorCode JsSetExternalData(JavaScriptValue obj, IntPtr externalData);

 internal static extern JavaScriptErrorCode JsIntToNumber(int intValue, out JavaScriptValue value);