facetwp custom range and custom starting points for slider

custom-hooks.php

<?php
/** set a custom range for a slider facet and set
 ** the start and end handles to the min/max of range instead of
 ** the min/max of the indexed data
 **/
add_filter( 'facetwp_render_output', function( $output, $params ) {
	if ( isset( $output['settings']['price'] ) ) {
		$output['settings']['price']['range'] = array(
			'min' => array( 0 ),
			'max' => array( 40000 )
		);
		$output['settings']['price']['start'] =  array( 0, 40000 );
	}
	return $output;
}, 10, 2 );