functions.php

<?php

function live_search_scripts() {
  
  wp_register_script( 'live-search', get_template_directory_uri() . '/scripts.js', array('jquery'), null, true );
  wp_enqueue_script( 'live-search' );
  
  $live_search = [
    'ajax_url' => admin_url('admin-ajax.php')
  ];
  
  wp_localize_script( 'live-search', 'live_search', $live_search );
  
}
add_action( 'wp_enqueue_scripts', 'live_search_scripts' );