sebastienros.jint/Jint/Runtime/Descriptors/PropertyFlag.cs

namespace Jint.Runtime.Descriptors
{
    [Flags]
    public enum PropertyFlag
    {
        None = 0,
        Enumerable = 1,
        EnumerableSet = 2,
        Writable = 4,
        WritableSet = 8,
        Configurable = 16,
        ConfigurableSet = 32,

        CustomJsValue = 256,

        // we can check for mutable binding and do some fast assignments
        MutableBinding = 512,

        // mark PropertyDescriptor as non data to accelerate IsDataDescriptor and avoid the side effect of CustomValue
        NonData = 1024,

        // common helpers
        AllForbidden = ConfigurableSet | EnumerableSet | WritableSet,
        ConfigurableEnumerableWritable = Configurable | Enumerable | Writable,
        NonConfigurable = ConfigurableSet | Enumerable | Writable,
        OnlyEnumerable = Enumerable | ConfigurableSet | WritableSet,
        NonEnumerable = Configurable | EnumerableSet | Writable,
        OnlyWritable = EnumerableSet | Writable | ConfigurableSet
    }
}