Applied coding styles to config files

config/env.js

@@ -1,4 +1,3 @@
-'use strict';
 
 const fs = require('fs');
 const path = require('path');
@@ -7,7 +6,8 @@ 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;
+const { NODE_ENV } = process.env;
+
 if (!NODE_ENV) {
   throw new Error(
     'The NODE_ENV environment variable is required but was not specified.'
@@ -15,9 +15,10 @@ if (!NODE_ENV) {
 }
 
 // https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
-var dotenvFiles = [
+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
@@ -30,7 +31,7 @@ var dotenvFiles = [
 // 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 => {
+dotenvFiles.forEach((dotenvFile) => {
   if (fs.existsSync(dotenvFile)) {
     require('dotenv-expand')(
       require('dotenv').config({
@@ -50,10 +51,11 @@ dotenvFiles.forEach(dotenvFile => {
 // https://github.com/facebookincubator/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))
+  .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
@@ -62,16 +64,19 @@ const REACT_APP = /^REACT_APP_/i;
 
 function getClientEnvironment(publicUrl) {
   const raw = Object.keys(process.env)
-    .filter(key => REACT_APP.test(key))
+    .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
@@ -79,10 +84,12 @@ function getClientEnvironment(publicUrl) {
         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;
     }, {}),
   };