/**
 * This source code was adapted from:
 * https://github.com/facebook/create-react-app/blob/v2.0.4/packages/babel-preset-react-app/webpack-overrides.js
 *
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * The MIT license for this code may be found on GitHub:
 * https://github.com/facebook/create-react-app/blob/v2.0.4/packages/babel-preset-react-app/LICENSE
 */

const crypto = require('crypto');
const macroCheck = new RegExp('[./]macro');

module.exports = function () {
  return {
    config(config, {source}) {
      // don't cache babel macros
      // https://github.com/babel/babel/issues/8497
      if (macroCheck.test(source)) {
        return Object.assign({}, config.options, {
          caller: Object.assign({}, config.options.caller, {
            macroInvalidationToken: crypto.randomBytes(32).toString('hex')
          })
        });
      }
      return config.options;
    }
  };
};