function finish(err, root) {
          /* istanbul ignore if */
          if (!callback) return;
          var cb = callback;
          callback = null;
          if (sync) throw err;
          cb(err, root);
        }
// Finishes loading by calling the callback (exactly once)
Finishes loading by calling the callback (exactly once)
Finishes loading by calling the callback ( exactly once )
function finish(err, root) {
          if (!callback) return;
          var cb = callback;
          callback = null;
          if (sync) throw err;
          cb(err, root);
        }
function finish ( err , root ) { if ( ! callback ) return ; var cb = callback ; callback = null ; if ( sync ) throw err ; cb ( err , root ) ; }
Finishes loading by calling the callback (exactly once)
Finishes loading by calling the callback ( exactly once )
/* istanbul ignore if */