WPGraphQL
WPGraphQL is a plugin that provides an extendable GraphQL schema and API for WordPress sites. It allows you to separate your CMS from your presentation layer.
Add-on FacetWP integration plugin
WPGraphQL offers its own add-on integration plugin to work with FacetWP.
This plugin exposes configured facets through the graph schema. Once registered for a type, a query is available. The payload includes both facet choices and information and a connection to the post type data. This allows for standard GraphQL pagination of the returned data set.
The plugin has been tested and is functional with SearchWP. Currently the plugin only has been tested using Checkboxes and Radio facet types.