old_contents: var RcLoader = require('rcloader');
  var jshint = require('jshint').JSHINT;
  var jshintcli = require('jshint/src/cli');
  var minimatch = require("minimatch");
  var _ = require("lodash");
  
  module.exports = function createLintFunction(userOpts) {
  
    var rcLoader = new RcLoader('.jshintrc', userOpts, {
      loader: function (path) {
        var cfg = jshintcli.loadConfig(path);
        delete cfg.dirname;
        return cfg;
      }
    });
  
    var reportErrors = function (file, out, cfg) {
      var filePath = (file.path || 'stdin');
  
      out.results = jshint.errors.map(function (err) {
        if (!err) return;
        return { file: filePath, error: err };
      }).filter(Boolean);
  
      out.opt = cfg;
      out.data = [jshint.data()];
      out.data[0].file = filePath;
    };
  
    return function lint(file, cb) {
      // pass through dirs, streaming files, etc.
      if (!file.isBuffer()) {
        return cb(null, file);
      }
      rcLoader.for(file.path, function (err, cfg) {
        if (err) return cb(err);
  
        var globals = {};
        if (cfg.globals) {
          globals = cfg.globals;
          delete cfg.globals;
        }
  
        if (cfg.overrides) {
          _.each(cfg.overrides, function (options, pattern) {
            if (!minimatch(file.path, pattern, { nocase: true, matchBase: true })) return;
  
            if (options.globals) {
              globals = _.extend(globals, options.globals);
              delete options.globals;
            }
  
            _.extend(cfg, options);
          });
  
          delete cfg.overrides;
        }
  
        // get or create file.jshint, we will write all output here
        var out = file.jshint || (file.jshint = {});
        var str = typeof out.extracted === 'string' ? out.extracted : file.contents.toString('utf8');
  
        out.success = jshint(str, cfg, globals);
        if (!out.success) reportErrors(file, out, cfg);
  
        return cb(null, file);
      });
    };
  };
  
new_contents: var RcLoader = require('rcloader');
  var jshint = require('jshint').JSHINT;
  var jshintcli = require('jshint/src/cli');
  var minimatch = require("minimatch");
  var _ = require("lodash");
  
  module.exports = function createLintFunction(userOpts) {
  
    var rcLoader = new RcLoader('.jshintrc', userOpts, {
      loader: function (path) {
        var cfg = jshintcli.loadConfig(path);
        delete cfg.dirname;
        return cfg;
      }
    });
  
    var reportErrors = function (file, out, cfg) {
      var filePath = (file.path || 'stdin');
  
      out.results = jshint.errors.map(function (err) {
        if (!err) return;
        return { file: filePath, error: err };
      }).filter(Boolean);
  
      out.opt = cfg;
      out.data = [jshint.data()];
      out.data[0].file = filePath;
    };
  
    return function lint(file, cb) {
      // pass through dirs, streaming files, etc.
      if (!file.isBuffer()) {
        return cb(null, file);
      }
      rcLoader.for(file.path, function (err, cfg) {
        if (err) return cb(err);
  
        var globals = {};
        if (cfg.globals) {
          globals = cfg.globals;
          delete cfg.globals;
        }
  
        if (cfg.overrides) {
          _.each(cfg.overrides, function (options, pattern) {
            if (!minimatch(file.path, pattern, { nocase: true, matchBase: true })) return;
  
            if (options.globals) {
              globals = _.extend(globals, options.globals);
              delete options.globals;
            }
  
            _.extend(cfg, options);
          });
  
          delete cfg.overrides;
        }
  
        // get or create file.jshint, we will write all output here
        var out = file.jshint || (file.jshint = {});
        var str = _.isString(out.extracted) ? out.extracted : file.contents.toString('utf8');
  
        out.success = jshint(str, cfg, globals);
        if (!out.success) reportErrors(file, out, cfg);
  
        return cb(null, file);
      });
    };
  };
  
subject: Use _.isString instead of typeof