functions.php

<?php
/**
 * Sage includes
 *
 * The $sage_includes array determines the code library included in your theme.
 * Add or remove files to the array as needed. Supports child theme overrides.
 *
 * Please note that missing files will produce a fatal error.
 *
 * @link https://github.com/roots/sage/pull/1042
 */
$sage_includes = [
  'lib/setup.php',                 // Initial setup and constants
  'lib/utils.php',                 // Utility functions
  'lib/wrapper.php',               // Theme wrapper class
  'lib/assets.php',                // Scripts and stylesheets
  'lib/titles.php',                // Page titles
  'lib/gallery.php',               // Custom [gallery]
  'lib/extras.php',                // Extra functions
  'lib/shortcodes.php',            // Shortcodes
  'lib/customizer.php',            // Theme customizer
  'lib/soil/soil.php',             // Soil Modules
  'admin/admin-init.php',          // Theme Options
];

foreach ($sage_includes as $file) {
  if (!$filepath = locate_template($file)) {
    trigger_error(sprintf(__('Error locating %s for inclusion', 'sage'), $file), E_USER_ERROR);
  }

  require_once $filepath;
}
unset($file, $filepath);