code: function moduleIfString (pathOrObject, type) {
    // If this is a string, treat if as module to be required
    try {
      if (_.isString(pathOrObject)) {
        // Attempt to find module without resolving the contents
        // If there is an error, the module does not exist (which
        // is ignored at the moment)
        // If there is no error, the module should be loaded and error while loading
        // the module should be reported
        require.resolve(path.resolve(pathOrObject))
      }
    } catch (e) {
      debug('Ignoring missing ' + type + ' module: ' + pathOrObject)
      pathOrObject = undefined
    }
  
    // Require module if needed
    if (_.isString(pathOrObject)) {
      var absPath = path.resolve(pathOrObject)
      delete require.cache[absPath]
      pathOrObject = require(absPath)
    }
    return pathOrObject
  }
docs: Internal function that returns `require`s a module if the parameter is a string.
  
  If parameter is a string (path) and a file with that path exists, load it as module
  If the parameter is not a string, just return it.
  If the parameter is a string, but the file does not exist, return `undefined`
  
  
  @param {string|*} pathOrObject path to the file or configuration
  @param {string} type additional information that can displayed in case the module is not found.
  @returns {*}
  @access private