text: /**
   * Copyright (c) 2017-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  
  const {parseQuery} = require('loader-utils');
  
  const TRUNCATE_MARKER = /<!--\s*truncate\s*-->/;
  
  module.exports = async function(fileString) {
    const callback = this.async();
  
    let finalContent = fileString;
  
    // Truncate content if requested (e.g: file.md?truncated=true)
    const {truncated} = this.resourceQuery && parseQuery(this.resourceQuery);
    if (truncated && TRUNCATE_MARKER.test(fileString)) {
      // eslint-disable-next-line
      finalContent = fileString.split(TRUNCATE_MARKER)[0];
    }
    return callback(null, finalContent);
  };
  