text: /*
   * This file is part of the Symfony Webpack Encore package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  'use strict';
  
  const WebpackConfig = require('../WebpackConfig'); //eslint-disable-line no-unused-vars
  
  /**
   * Helper for determining the manifest.json key prefix.
   *
   * @param {WebpackConfig} webpackConfig
   * @return {string}
   */
  module.exports = function(webpackConfig) {
      let manifestPrefix = webpackConfig.manifestKeyPrefix;
      if (null === manifestPrefix) {
          if (null === webpackConfig.publicPath) {
              throw new Error('publicPath is not set on WebpackConfig');
          }
  
          // by convention, we remove the opening slash on the manifest keys
          manifestPrefix = webpackConfig.publicPath.replace(/^\//, '');
      }
  
      return manifestPrefix;
  };
  