Public MustInherit Class ChannelListenerBase(Of TChannel As {Class, IChannel}) _
    Inherits ChannelListenerBase _
    Implements IChannelListener(Of TChannel), IChannelListener,  _
    ICommunicationObject

Dim instance As ChannelListenerBase(Of TChannel)

public abstract class ChannelListenerBase<TChannel> : ChannelListenerBase, 
    IChannelListener<TChannel>, IChannelListener, ICommunicationObject
where TChannel : class, IChannel

generic<typename TChannel>
where TChannel : ref class, IChannel
public ref class ChannelListenerBase abstract : public ChannelListenerBase, 
    IChannelListener<TChannel>, IChannelListener, ICommunicationObject

JScript does not support generic types or methods.