取得 Ticket

export const TICKET_ISSUE = gql`
  mutation TicketIssue {
    ticketIssue {
      ticket
      expiredAt
    }
  }
`;


type TicketIssueResponse = {
  ticketIssue: {
    ticket?: string;
    expiredAt?: string; // iso 8601
  };
};

function main() {
  // ...
  const [ticketIssue] = useMutation<TicketIssueResponse>(ISSUE_TICKET);
  
  function createTicket() {
    const ticketResult = await ticketIssue();    
    console.log(ticketResult.data?.ticketIssue.ticket)
    return ticketResult
  }
  // ...
}