code: function resolveSassPath(sassPath, loadPaths, extensions) {
    // trim sass file extensions
    var re = new RegExp('(\.('+extensions.join('|')+'))$', 'i');
    var sassPathName = sassPath.replace(re, '');
    // check all load paths
    var i, j, length = loadPaths.length, scssPath, partialPath;
    for (i = 0; i < length; i++) {
      for (j = 0; j < extensions.length; j++) {
        scssPath = path.normalize(loadPaths[i] + '/' + sassPathName + '.' + extensions[j]);
        try {
          if (fs.lstatSync(scssPath).isFile()) {
            return scssPath;
          }
        } catch (e) {}
      }
  
      // special case for _partials
      for (j = 0; j < extensions.length; j++) {
        scssPath = path.normalize(loadPaths[i] + '/' + sassPathName + '.' + extensions[j]);
        partialPath = path.join(path.dirname(scssPath), '_' + path.basename(scssPath));
        try {
          if (fs.lstatSync(partialPath).isFile()) {
            return partialPath;
          }
        } catch (e) {}
      }
    }
  
    // File to import not found or unreadable so we assume this is a custom import
    return false;
  }
docs: resolve a sass module to a path