facetwp force query args

custom-hooks.php

<?php
/** to use this make sure all queries to be used 
 ** for facets have 'facetwp' => true in query args, including the
 ** query args setting in a facetwp template
 **/

// add 'facetwp' => false anytime it is not already set
add_action( 'pre_get_posts', function( $query ) {
    if ( ! isset( $query->query_var['facetwp'] ) ) {
	    $query->set( 'facetwp', false );
    }
    return $query;
});

// use 'facetwp' query arg to determine main query
add_filter( 'facetwp_is_main_query', function( $is_main_query, $query ) {
	if ( isset( $query->query_vars['facetwp'] ) ) {
		$is_main_query = (bool) $query->query_vars['facetwp'];
	}
	return $is_main_query;
}, 10, 2 );