text: 'use strict';
  
  const fs = require('fs');
  const path = require('path');
  const { execSync } = require('child_process');
  
  const paths = require('./paths');
  
  // Make sure that including paths.js after env.js will read .env variables.
  delete require.cache[require.resolve('./paths')];
  
  const NODE_ENV = process.env.NODE_ENV;
  if (!NODE_ENV) {
    throw new Error('The NODE_ENV environment variable is required but was not specified.');
  }
  
  // https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
  const dotenvFiles = [
    `${paths.dotenv}.${NODE_ENV}.local`,
    `${paths.dotenv}.${NODE_ENV}`,
    // Don't include `.env.local` for `test` environment
    // since normally you expect tests to produce the same
    // results for everyone
    NODE_ENV !== 'test' && `${paths.dotenv}.local`,
    paths.dotenv,
  ].filter(Boolean);
  
  // Load environment variables from .env* files. Suppress warnings using silent
  // if this file is missing. dotenv will never modify any environment variables
  // that have already been set.  Variable expansion is supported in .env files.
  // https://github.com/motdotla/dotenv
  // https://github.com/motdotla/dotenv-expand
  dotenvFiles.forEach((dotenvFile) => {
    if (fs.existsSync(dotenvFile)) {
      require('dotenv-expand')(
        require('dotenv').config({
          path: dotenvFile,
        })
      );
    }
  });
  
  function getGitSha() {
    try {
      const sha = execSync('git rev-parse --short', { stdio: ['ignore', 'ignore', 'ignore'] });
      return sha;
    } catch (e) {
      return 'test';
    }
  }
  
  // We support resolving modules according to `NODE_PATH`.
  // This lets you use absolute paths in imports inside large monorepos:
  // https://github.com/facebook/create-react-app/issues/253.
  // It works similar to `NODE_PATH` in Node itself:
  // https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
  // Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
  // Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
  // https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421
  // We also resolve them to make sure all tools using them work consistently.
  const appDirectory = fs.realpathSync(process.cwd());
  process.env.NODE_PATH = (process.env.NODE_PATH || '')
    .split(path.delimiter)
    .filter((folder) => folder && !path.isAbsolute(folder))
    .map((folder) => path.resolve(appDirectory, folder))
    .join(path.delimiter);
  
  // Grab NODE_ENV and COMPOSER_* environment variables and prepare them to be
  // injected into the application via DefinePlugin in Webpack configuration.
  const COMPOSER = /^COMPOSER_/i;
  
  function getClientEnvironment(publicUrl) {
    const raw = Object.keys(process.env)
      .filter((key) => COMPOSER.test(key))
      .reduce(
        (env, key) => {
          env[key] = process.env[key];
          return env;
        },
        {
          // Useful for determining whether we’re running in production mode.
          // Most importantly, it switches React into the correct mode.
          NODE_ENV: process.env.NODE_ENV || 'development',
          // Useful for resolving the correct path to static assets in `public`.
          // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
          // This should only be used as an escape hatch. Normally you would put
          // images into the `src` and `import` them in code to get their paths.
          PUBLIC_URL: publicUrl,
          GIT_SHA: getGitSha().toString().replace('\n', ''),
          SDK_PACKAGE_VERSION: '4.11.0', // TODO: change this when Composer supports custom schema/custom runtime
          COMPOSER_VERSION: '1.2.0',
          LOCAL_PUBLISH_PATH:
            process.env.LOCAL_PUBLISH_PATH || path.resolve(process.cwd(), '../../../extensions/localPublish/hostedBots'),
        }
      );
    // Stringify all values so we can feed into Webpack DefinePlugin
    const stringified = {
      'process.env': Object.keys(raw).reduce((env, key) => {
        env[key] = JSON.stringify(raw[key]);
        return env;
      }, {}),
    };
  
    return { raw, stringified };
  }
  
  module.exports = getClientEnvironment;
  