export default createAggregator;
/**
 * Creates a function like `groupBy`.
 *
 * @ignore
 * @private
 * @param {Function} setter The function to set accumulator values.
 * @param {Function} [initializer] The accumulator object initializer.
 * @returns {Function} Returns the new aggregator function.
 */
declare function createAggregator(setter: Function, initializer?: Function): Function;