Post.js

  <button
    onClick={() =>
      data.fetchMore({
        variables: {
          offset: data.data.post.length,
        },
        updateQuery: (prev, { fetchMoreResult }) => {
          if (!fetchMoreResult) return prev;
          return Object.assign({}, prev, {
            post: [...prev.post, ...fetchMoreResult.post],
          });
        },
      })
    }
  >
  refetch
</button>