1  'use strict';
 2  
 3  const path = require('path');
 4  const fs = require('fs');
 5  const url = require('url');
 6  
 7  // Make sure any symlinks in the project folder are resolved:
 8  // https://github.com/facebookincubator/create-react-app/issues/637
 9  const appDirectory = fs.realpathSync(process.cwd());
10  const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
11  
12  const envPublicUrl = process.env.PUBLIC_URL;
13  
14  function ensureSlash(path, needsSlash) {
15    const hasSlash = path.endsWith('/');
16    if (hasSlash && !needsSlash) {
17      return path.substr(path, path.length - 1);
18    } else if (!hasSlash && needsSlash) {
19      return `${path}/`;
20    } else {
21      return path;
22    }
23  }
24  
25  const getPublicUrl = appPackageJson =>
26    envPublicUrl || require(appPackageJson).homepage;
27  
28  // We use `PUBLIC_URL` environment variable or "homepage" field to infer
29  // "public path" at which the app is served.
30  // Webpack needs to know it to put the right <script> hrefs into HTML even in
31  // single-page apps that may serve index.html for nested URLs like /todos/42.
32  // We can't use a relative path in HTML because we don't want to load something
33  // like /todos/42/static/js/bundle.7289d.js. We have to know the root.
34  function getServedPath(appPackageJson) {
35    const publicUrl = getPublicUrl(appPackageJson);
36    const servedUrl =
37      envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
38    return ensureSlash(servedUrl, true);
39  }
40  
41  // config after eject: we're in ./config/
42  module.exports = {
43    dotenv: resolveApp('.env'),
44    appBuild: resolveApp('build'),
45    appPublic: resolveApp('public'),
46    appHtml: resolveApp('public/index.html'),
47    appIndexJs: resolveApp('src/index.js'),
48    appPackageJson: resolveApp('package.json'),
49    appSrc: resolveApp('src'),
50    yarnLockFile: resolveApp('yarn.lock'),
51    testsSetup: resolveApp('src/setupTests.js'),
52    appNodeModules: resolveApp('node_modules'),
53    publicUrl: getPublicUrl(resolveApp('package.json')),
54    servedPath: getServedPath(resolveApp('package.json')),
55  };