React Apollo: Using Subscriptions

gql-strings.ts

const messagesQuery = gql`
  query MessagesQuery {
    messages {
      id
      from
      text
    }
  }
`;

const messageAddedSubscription = gql`
  subscription {
    messageAdded {
      id
      from
      text
    }
  }
`;

const addMessageMutation = gql`
  mutation AddMessageMutation($input: MessageInput!) {
    message: addMessage(input: $input) {
      id
      from
      text
    }
  }
`;