lib/cache.js
function (filename, ext) {
  if (!_.isString(filename) || !_.isString(ext)) {
    return false;
  }
  ext = ext.slice(0, 1) === '.' ? ext : ('.' + ext);
  return !!(filename && filename.split(ext).pop() === '');
}
function (filename, ext) {
  if (!_.isString(filename) || !_.isString(ext)) {
    return false;
  }
  ext = ext.slice(0, 1) === '.' ? ext : ('.' + ext);
  return !!(filename && filename.split(ext).pop() === '');
}
function ( filename , ext ) { if ( ! _ . isString ( filename ) || ! _ . isString ( ext ) ) { return false ; } ext = ext . slice ( 0 , 1 ) === '.' ? ext : ( '.' + ext ) ; return ! ! ( filename && filename . split ( ext ) . pop ( ) === '' ) ; }
return if the filename with the extension
return if the filename with the extension