As it stands WP-GraphQL doesn't implement the totalCount field. This is due to a number of reasons, including the performance impact that would come with such a query.

We found that we needed this for a site being developed, so built up this basic plugin.

Whilst this doesn't implement the totalCount field as per the GraphQL docs, it does add a total field to the pageInfo object that is used for pagination. This seemed like the most sensible place to put it, as 99% of the time, we'll be using this field to pull back the total number of items, alongside our paginated result.

To retrieve to total count, it's a simple case of requesting the total field with your pageInfo. See below:

{ posts(first:1) { edges { node { id title } } pageInfo { total hasNextPage endCursor } } }

This will then give you a result as such:

{ "data": { "posts": { "edges": [ { "node": { "id": "cG9zdDozOA==", "title": "Post B" } } ], "pageInfo": { "total": 2, "hasNextPage": true, "endCursor": "YXJyYXljb25uZWN0aW9uOjM4" } } } }

As you can see, the total number of items is accessible via data.posts.pageInfo.total.

Contributions are welcome. This was a very quick build and as such there are probably performance gains to be had.

Feel free to make a PR against this repo!