YOURMODULENAME.module.php

<?php
/**
 * Implements hook_library_info_build().
 */
function YOURMODULENAME_library_info_build() {
  $libraries = [];
  $module = \Drupal::moduleHandler()->getModule('YOURMODULENAME');
  $module_path = $module->getPath();
  $path_to_js = \Drupal::service('file_system')->realpath($module_path) . '/js';
  $path_to_manifest = $path_to_js . '/build/asset-manifest.json';
  $manifest = Json::decode(file_get_contents($path_to_manifest));

  $path_prefix = 'js/build';

  // Check if we have files in the manifest.
  if (!empty($manifest)) {
    $js = [];
    $css = [];

    foreach ($manifest as $manifest_file) {

      // If this is not a map file.
      if (stripos($manifest_file, '.map.') === FALSE) {

        if (substr($manifest_file, -3) === '.js'
          && stripos($manifest_file, 'service-worker') === FALSE
        ) {
          $js[$path_prefix . $manifest_file] = [
            'minified' => TRUE,
            'preprocess' => FALSE,
          ];
        }
        elseif (substr($manifest_file, -4) === '.css') {
          $css[$path_prefix . $manifest_file] = [];
        }
      }
    }

    $libraries = [
      'YOURLIBRARY.NAME' => [
        'version' => 'VERSION',
        'js' => $js,
        'css' => [
          'theme' => $css,
        ],
      ],
    ];
  }

  return $libraries;
}