hash-for-dep/lib/resolve-pkg.js

'use strict';
var fs = require('fs');
var resolve = require('resolve');
var path = require('path');

/* @private
 *
 * @method resolvePkg
 * @param {String} name
 * @param {String} dir
 * @return {String}
 */
module.exports = function resolvePkg(name, dir) {
  if (name.charAt(0) === '/') {
    return name;
  }
  if (name === './') {
    return path.resolve(name);
  }
  try {
    return resolve.sync(name, {
      basedir: dir || __dirname,
      isFile: isDirectory,
      preserveSymlinks: false
    });
  } catch(err) {
    if (err.code === 'MODULE_NOT_FOUND') {
      return null;
    }

    throw err;
  }
};

function isDirectory(file) {
  var stat;

  try {
    stat = fs.statSync(file);
  }
  catch (err) {
    if (err && err.code === 'ENOENT') {
      return false;
    }
  }

  return stat.isDirectory();
}