ifCommonChannelDirectMessagesEventMessage
inline fun <T> OptionallyWithUser.ifCommonChannelDirectMessagesEventMessage(block: (CommonChannelDirectMessagesEventMessage<ChannelDirectMessagesEvent>) -> T): T?
inline fun <T> Message.ifCommonChannelDirectMessagesEventMessage(block: (CommonChannelDirectMessagesEventMessage<ChannelDirectMessagesEvent>) -> T): T?