'use strict';
 
 const path = require('path');
 const fs = require('fs');
 const url = require('url');
 
 // Make sure any symlinks in the project folder are resolved:
 // https://github.com/facebookincubator/create-react-app/issues/637
 const appDirectory = fs.realpathSync(process.cwd());
 const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
 
 const envPublicUrl = process.env.PUBLIC_URL;
 
 function ensureSlash(path, needsSlash) {
   const hasSlash = path.endsWith('/');
   if (hasSlash && !needsSlash) {
     return path.substr(path, path.length - 1);
   } else if (!hasSlash && needsSlash) {
     return `${path}/`;
   } else {
     return path;
   }
 }
 
 const getPublicUrl = appPackageJson =>
   envPublicUrl || require(appPackageJson).homepage;
 
 // We use `PUBLIC_URL` environment variable or "homepage" field to infer
 // "public path" at which the app is served.
 // Webpack needs to know it to put the right <script> hrefs into HTML even in
 // single-page apps that may serve index.html for nested URLs like /todos/42.
 // We can't use a relative path in HTML because we don't want to load something
 // like /todos/42/static/js/bundle.7289d.js. We have to know the root.
 function getServedPath(appPackageJson) {
   const publicUrl = getPublicUrl(appPackageJson);
   const servedUrl =
     envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
   return ensureSlash(servedUrl, true);
 }
 
 // config after eject: we're in ./config/
 module.exports = {
   dotenv: resolveApp('.env'),
   appBuild: resolveApp('build'),
   appPublic: resolveApp('public'),
   appHtml: resolveApp('public/index.html'),
   appIndexJs: resolveApp('src/index.js'),
   appPackageJson: resolveApp('package.json'),
   appSrc: resolveApp('src'),
   yarnLockFile: resolveApp('yarn.lock'),
   testsSetup: resolveApp('src/setupTests.js'),
   appNodeModules: resolveApp('node_modules'),
   publicUrl: getPublicUrl(resolveApp('package.json')),
   servedPath: getServedPath(resolveApp('package.json')),
 };