/**
 * Internal symbols used to identify different types of updates.
 */
declare const $set: unique symbol;
declare const $remove: unique symbol;
declare const $delete: unique symbol;
declare const $add: unique symbol;
declare const $subtract: unique symbol;
declare const $append: unique symbol;
declare const $prepend: unique symbol;
declare const $addToSet: unique symbol;
declare const $ref: unique symbol;
declare function isUpdateSymbol(value: unknown): boolean;

export { $add, $addToSet, $append, $delete, $prepend, $ref, $remove, $set, $subtract, isUpdateSymbol };