@qelos/assets/node_modules/mongoose/lib/helpers/query/isOperator.js

manage assets like images and static files on remote servers

'use strict';

const specialKeys = new Set([
  '$ref',
  '$id',
  '$db'
]);

module.exports = function isOperator(path) {
  return (
    path[0] === '$' &&
    !specialKeys.has(path)
  );
};