Type Alias dispatch

dispatch: TxDescriptor<
    {
        meta_tx: {
            call: TxCallData;
            extension: [
                Enum<
                    {
                        Disabled: undefined;
                        Signed: { account: SS58String; signature: MultiSignature };
                    },
                >,
                undefined,
                undefined,
                undefined,
                undefined,
                undefined,
                ExtensionsCheckMortality,
                number,
                Enum<{ Disabled: undefined; Enabled: undefined }>,
            ];
            extension_version: number;
        };
    },
>