FacetWP - available facet settings

test.js

/* updated 2019-02-22 */
{
    "facets": [
        {
            "name": "test_checkboxes",
            "label": "Test checkboxes",
            "type": "checkboxes",
            "source": "post_type",
            "parent_term": "",
            "hierarchical": "no",
            "show_expanded": "no",
            "ghosts": "no",
            "preserve_ghosts": "no",
            "operator": "and",
            "orderby": "count",
            "count": "10",
            "soft_limit": "5"
        },
        {
            "name": "test_dropdown",
            "label": "Test dropdown",
            "type": "dropdown",
            "source": "post_type",
            "parent_term": "",
            "hierarchical": "no",
            "orderby": "count",
            "count": "20",
            "label_any": "Any"
        },
        {
            "name": "test_fselect",
            "label": "Test fSelect",
            "type": "fselect",
            "source": "post_type",
            "parent_term": "",
            "hierarchical": "no",
            "ghosts": "no",
            "preserve_ghosts": "no",
            "operator": "and",
            "orderby": "count",
            "count": "10",
            "label_any": "Any",
            "multiple": "no"
        },
        {
            "name": "test_hierarchy",
            "label": "Test hierarchy",
            "type": "checkboxes",
            "source": "post_type",
            "parent_term": "",
            "hierarchical": "no",
            "show_expanded": "no",
            "ghosts": "no",
            "preserve_ghosts": "no",
            "operator": "and",
            "orderby": "count",
            "count": "10",
            "soft_limit": "5"
        },
        {
            "name": "test_search",
            "label": "Test search",
            "type": "search",
            "source": "post_type",
            "search_engine": "",
            "placeholder": "",
            "auto_refresh": "no"
        },
        {
            "name": "test_autocomplete",
            "label": "Test autocomplete",
            "type": "autocomplete",
            "source": "post_type",
            "placeholder": ""
        },
        {
            "name": "test_slider",
            "label": "Test slider",
            "type": "slider",
            "source": "post_type",
            "compare_type": "",
            "prefix": "",
            "suffix": "",
            "format": "0,0",
            "step": "1",
            "source_other": ""
        },
        {
            "name": "test_date_range",
            "label": "Test date range",
            "type": "date_range",
            "source": "post_type",
            "compare_type": "",
            "fields": "both",
            "format": "",
            "source_other": ""
        },
        {
            "name": "test_number_range",
            "label": "Test number range",
            "type": "number_range",
            "source": "post_type",
            "fields": "both",
            "compare_type": "",
            "source_other": ""
        },
        {
            "name": "test_proximity",
            "label": "Test proximity",
            "type": "proximity",
            "source": "post_type",
            "unit": "mi",
            "radius_ui": "dropdown",
            "radius_options": "10, 25, 50, 100, 250",
            "radius_min": "1",
            "radius_max": "50",
            "radius_default": "25",
            "source_other": ""
        },
        {
            "name": "test_radio",
            "label": "Test radio",
            "type": "radio",
            "source": "post_type",
            "parent_term": "",
            "ghosts": "no",
            "preserve_ghosts": "no",
            "operator": "or",
            "orderby": "count",
            "count": "20"
        },
        {
            "name": "test_star_rating",
            "label": "Test star rating",
            "type": "rating",
            "source": "post_type"
        }
    ]
}

Here's the loadmore one...

    $facets[] = [
        "label"             => "Load More",
        "name"              => "loadmore",
        "type"              => "pager",
        "pager_type"        => "load_more", /* numbers, counts, load_more, per_page */
        "load_more_text"    => "Load more...",
        "loading_text"      => "Fetching...",
    ];

proximity with miles, I'm assuming the more sane world would want to use km for the unit

{
  "facets": [
    {
      "name": "location",
      "label": "Location",
      "type": "proximity",
      "source": "acf/field_id",
      "unit": "mi",
      "radius_ui": "dropdown",
      "radius_options": "10, 25, 50, 100, 250",
      "radius_min": "1",
      "radius_max": "50",
      "radius_default": "25",
    }
  ]
}

see also https://facetwp.com/help-center/facets/facet-types/proximity/ (this facet needs a google api key to work)