Commit d4988bcb authored by 13138449's avatar 13138449
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parent 29983566
'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.'
var dotenvFiles = [
// 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`,
// 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.
dotenvFiles.forEach(dotenvFile => {
if (fs.existsSync(dotenvFile)) {
path: dotenvFile,
// We support resolving modules according to `NODE_PATH`.
// This lets you use absolute paths in imports inside large monorepos:
// It works similar to `NODE_PATH` in Node itself:
// 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.
// 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 || '')
.filter(folder => folder && !path.isAbsolute(folder))
.map(folder => path.resolve(appDirectory, folder))
// 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))
(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,
// 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;
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