/**
 * Matches values that are equal to a specified value.
 */
export declare const $eq: import("../../util").Callback<any>;
/**
 * Matches values that are greater than a specified value.
 */
export declare const $gt: import("../../util").Callback<any>;
/**
 * 	Matches values that are greater than or equal to a specified value.
 */
export declare const $gte: import("../../util").Callback<any>;
/**
 * Matches any of the values that exist in an array specified in the query.
 */
export declare const $in: import("../../util").Callback<any>;
/**
 * Matches values that are less than the value specified in the query.
 */
export declare const $lt: import("../../util").Callback<any>;
/**
 * Matches values that are less than or equal to the value specified in the query.
 */
export declare const $lte: import("../../util").Callback<any>;
/**
 * Matches all values that are not equal to the value specified in the query.
 */
export declare const $ne: import("../../util").Callback<any>;
/**
 * Matches values that do not exist in an array specified to the query.
 */
export declare const $nin: import("../../util").Callback<any>;