Creates a RpcSubscriptions instance that exposes the Solana JSON RPC WebSocket API given a cluster URL and some optional channel config. See createDefaultRpcSubscriptionsChannelCreator for the shape of the channel config.
Optional
Creates a RpcSubscriptions instance that exposes the Solana JSON RPC WebSocket API given a cluster URL and some optional channel config. See createDefaultRpcSubscriptionsChannelCreator for the shape of the channel config.