DEFAULT_RPC_CONFIGconst DEFAULT_RPC_CONFIG: Partial<NonNullable<Parameters<typeof createSolanaRpcApi>[0]>>; When you create Rpc instances with custom transports but otherwise the default RPC API behaviours, use this. Example const myCustomRpc = createRpc({ api: createSolanaRpcApi(DEFAULT_RPC_CONFIG), transport: myCustomTransport, });