text: "use strict"
  
  const fs = require("fs")
  const path = require("path")
  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
        })
      )
    }
  })
  
  // 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 REACT_APP_* environment variables and prepare them to be
  // injected into the application via DefinePlugin in webpack configuration.
  const REACT_APP = /^REACT_APP_/i
  
  function getClientEnvironment(publicUrl) {
    const raw = Object.keys(process.env)
      .filter(key => REACT_APP.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,
          // We support configuring the sockjs pathname during development.
          // These settings let a developer run multiple simultaneous projects.
          // They are used as the connection `hostname`, `pathname` and `port`
          // in webpackHotDevClient. They are used as the `sockHost`, `sockPath`
          // and `sockPort` options in webpack-dev-server.
          WDS_SOCKET_HOST: process.env.WDS_SOCKET_HOST,
          WDS_SOCKET_PATH: process.env.WDS_SOCKET_PATH,
          WDS_SOCKET_PORT: process.env.WDS_SOCKET_PORT
        }
      )
    // 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
      }, {}),
      __DEV__: true,
      SharedArrayBuffer: true,
      spyOnDev: true,
      spyOnDevAndProd: true,
      spyOnProd: true,
      __PROFILE__: true,
      __UMD__: true,
      __EXPERIMENTAL__: true,
      __VARIANT__: true,
      gate: true,
      trustedTypes: true
    }
  
    return { raw, stringified }
  }
  
  module.exports = getClientEnvironment
  