docs: function getAdditionalModulePaths(options = {}) {
    const baseUrl = options.baseUrl;
  
    // We need to explicitly check for null and undefined (and not a falsy value) because
    // TypeScript treats an empty string as `.`.
    if (baseUrl == null) {
      // If there's no baseUrl set we respect NODE_PATH
      // Note that NODE_PATH is deprecated and will be removed
      // in the next major release of create-react-app.
  
      const nodePath = process.env.NODE_PATH || '';
      return nodePath.split(path.delimiter).filter(Boolean);
    }
  
    const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
  
    // We don't need to do anything if `baseUrl` is set to `node_modules`. This is
    // the default behavior.
    if (path.relative(paths.appNodeModules, baseUrlResolved) === '') {
      return null;
    }
  
    // Allow the user set the `baseUrl` to `appSrc`.
    if (path.relative(paths.appSrc, baseUrlResolved) === '') {
      return [paths.appSrc];
    }
  
    // Otherwise, throw an error.
    throw new Error(
      chalk.red.bold(
        "Your project's `baseUrl` can only be set to `src` or `node_modules`." +
          ' Create React App does not support other values at this time.'
      )
    );
  }