How to use the @keystonejs/utils.mapKeyNames function in @keystonejs/utils

function graphQlQueryToMongoJoinQuery(query) {
      const _query = {
        ...query.where,
        ...mapKeyNames(
          // Grab all the modifiers
          pick(query, ['search', 'orderBy', 'skip', 'first']),
          // and prefix with a dollar symbol so they can be picked out by the
          // query builder tokeniser
          key => `$${key}`
        ),
      };

      return mapKeys(_query, field => {
        if (getType(field) !== 'Object' || !field.where) {
          return field;
        }

        // recurse on object (ie; relationship) types
        return graphQlQueryToMongoJoinQuery(field);
      });