import { $currentDate } from './field';
type Union<A, B> = {
    [k in keyof A | keyof B]: k extends keyof A ? A[k] : k extends keyof B ? B[k] : never;
};
/**
 * The positional operator identifies **an element** or **multiple elements** matching a
 * given query condition to be updated in an array.
 * @param field _(optional)_ field of the array document to update.
 *
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/positional/
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/positional-all/
 *
 * @example
 * ```ts
 * // Increment by one the first element that matches the update query
 * $().$inc(1);
 *
 * // Increment by one the first element's `score` field that matches the update query
 * $('score').$inc(1);
 *
 * // Increment all elements by one
 * $('[]').$inc(1);
 *
 * // Increment all elements' `score` field by one
 * $('[].score').$inc(1);
 *
 * // Find all `grades` documents that have the `std` lower than seven
 * // and increment their `grade` by ten.
 * collection.updateOne(
 *   criteria,
 *   flatten({ grades: $('[element].grade').$inc(10) }),
 *   { arrayFilters: [{ 'element.std': { $lt: 7 } }] }
 * );
 * ```
 */
export declare const $: (field?: number | string) => {
    /**
     * Merges the array element(s) identified by the current positional operator
     * with the given object.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/positional-all/#nested-arrays
     * @param value object to merge
     *
     * @example
     * ```ts
     * flatten({ points: $('[]').merge({ x: 0, y: 1 }) });
     *
     * // {
     * //   $set: {
     * //     'points.$[].x': 1,
     * //     'points.$[].y': 2,
     * //   }
     * // }
     * ```
     */
    merge: <T extends Record<string, any>>(value: T) => import("./operator").Operator;
    /**
     * @see {@link $inc}
     */
    $inc: <T_1>(value?: T_1 | undefined) => import("./operator").Operator;
    /**
     * @see {@link $mul}
     */
    $mul: <T_2>(value?: T_2 | undefined) => import("./operator").Operator;
    /**
     * @see {@link $set}
     */
    $set: <T_3>(value: T_3) => import("./operator").Operator;
    /**
     * @see {@link $unset}
     */
    $unset: () => import("./operator").Operator;
    /**
     * @see {@link $rename}
     */
    $rename: (field: string) => import("./operator").Operator;
    /**
     * @see {@link $min}
     */
    $min: <T_4>(value: T_4) => import("./operator").Operator;
    /**
     * @see {@link $max}
     */
    $max: <T_5>(value: T_5) => import("./operator").Operator;
    /**
     * @see {@link $currentDate}
     */
    $currentDate: (type?: Parameters<typeof $currentDate>[0]) => import("./operator").Operator;
    /**
     * @see {@link $timestamp}
     */
    $timestamp: () => import("./operator").Operator;
};
/**
 * Adds a value to an array unless the value is already present.
 * To add multiple values, chain with `$each` operator.
 * @param value the value to add
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/addToSet/
 *
 * @example
 * ```ts
 * // add just one element
 * flatten({ permissions: $addToSet('admin') });
 *
 * // add multiple elements
 * flatten({ permissions: $addToSet(['read', 'write']).$each() });
 * ```
 */
export declare const $addToSet: <T>(value: T) => {
    /**
     * Specifies that value to add is an array and that each element should be added.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/each/
     */
    $each: () => import("./operator").Operator;
};
/**
 * Removes the first or last element of an array.
 * @param value specify `-1` to remove the first element, `1` to remove the last element
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/pop/
 *
 * @example
 * ```ts
 * // remove the first element from the array
 * flatten({ grades: $pop(-1) });
 * // same as:
 * flatten({ grades: $pop().first() });
 * ```
 */
export declare const $pop: (value?: 1 | -1) => {
    /**
     * Removes the first element from the array.
     */
    first: () => import("./operator").Operator;
    /**
     * Removes the last element from the array.
     */
    last: () => import("./operator").Operator;
};
/**
 * Removes all instances of the specified values from an existing array.
 * @param value the value(s) to remove from the array
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/pullAll/
 *
 * @example
 * ```ts
 * // remove all instances of the value `1` and `2` from the array
 * flatten({ score: $pullAll([1, 2]) });
 * ```
 */
export declare const $pullAll: <T>(value: T | T[]) => import("./operator").Operator;
/**
 * Removes from an existing array all instances of a value or values that match a specified condition.
 * Unlike the {@link $pullAll} operator, this operator can be used to remove all instances that match a query.
 * @param value the value(s) or condition to match to remove from the array
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/pull/
 *
 * @example
 * ```ts
 * // remove all instances of the value `0` and `1` from the array;
 * // same as using $pullAll
 * flatten({ scores: $pull([0, 1]) });
 *
 * // remove all instances lower than or equal to `3`
 * flatten({ scores: $pull({ $lte: 3 }) })
 *
 * // remove all documents with the field `name` equal to `Test`
 * flatten({ users: $pull({ name: { $eq: 'Test' } }) })
 * ```
 */
export declare const $pull: <T>(value: T | T[]) => import("./operator").Operator;
/**
 * Appends a specified value to an array.
 * @param value the value(s) to append to the array
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/push/
 *
 * @example
 * ```ts
 * // append one element
 * flatten({ scores: $push(1) });
 *
 * // append multiple elements
 * flatten({ scores: $push([1, 2, 3]).$each() });
 *
 * // append an element and update to leave only the last ten
 * flatten({ scores: $push(7).$each().$slice(-10) });
 *
 * // append an element and update to leave only the last ten sorted by value
 * flatten({ scores: $push(7).$each().$sort(1).$slice(-10) });
 *
 * // append an element at position three in the array
 * flatten({ scores: $push(7).$each().$position(2) });
 * ```
 */
export declare const $push: <T>(value?: T | T[]) => {
    /**
     * Specifies that value to add is an array and that each element should be added.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/each/
     */
    $each: () => {
        /**
         * Orders the elements of an array.
         * @param value sort specification (default `1`)
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
         *
         * @example
         * ```ts
         * // sort ascending an array of numbers
         * flatten({ scores: $push().$each().$sort(1) });
         *
         * // sort descending an array of numbers
         * flatten({ scores: $push().$each().$sort(-1) });
         *
         * // sort ascending an array of documents with `name` field
         * flatten({ users: $push().$each().$sort({ name: 1 }) });
         * ```
         */
        $sort: <S>(specification?: S | undefined) => Union<{
            /**
             * Limits the number of array elements.
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
             *
             * @example
             * ```ts
             * // leave only the first 3 elements
             * flatten({ grades: $push().$each().$slice(3) });
             *
             * // leave only the last element
             * flatten({ grades: $push().$each().$slice(-1) });
             *
             * // empty the array
             * flatten({ grades: $push().$each().$slice(0) });
             * ```
             */
            $slice: (count: number) => Union<{
                /**
                 * Specifies the location in the array at which the `$push` operator inserts elements.
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
                 * @param index zero-based index
                 *
                 * @example
                 * ```ts
                 * // insert element `10` at position 1 in the array
                 * flatten({ scores: $push(10).$each().$position(1) });
                 * ```
                 */
                $position: (index: number) => Union<unknown, unknown>;
            }, unknown>;
        }, {
            /**
             * Specifies the location in the array at which the `$push` operator inserts elements.
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
             * @param index zero-based index
             *
             * @example
             * ```ts
             * // insert element `10` at position 1 in the array
             * flatten({ scores: $push(10).$each().$position(1) });
             * ```
             */
            $position: (index: number) => Union<{
                /**
                 * Limits the number of array elements.
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
                 *
                 * @example
                 * ```ts
                 * // leave only the first 3 elements
                 * flatten({ grades: $push().$each().$slice(3) });
                 *
                 * // leave only the last element
                 * flatten({ grades: $push().$each().$slice(-1) });
                 *
                 * // empty the array
                 * flatten({ grades: $push().$each().$slice(0) });
                 * ```
                 */
                $slice: (count: number) => Union<unknown, unknown>;
            }, unknown>;
        }>;
        /**
         * Limits the number of array elements.
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
         *
         * @example
         * ```ts
         * // leave only the first 3 elements
         * flatten({ grades: $push().$each().$slice(3) });
         *
         * // leave only the last element
         * flatten({ grades: $push().$each().$slice(-1) });
         *
         * // empty the array
         * flatten({ grades: $push().$each().$slice(0) });
         * ```
         */
        $slice: (count: number) => Union<{
            /**
             * Specifies the location in the array at which the `$push` operator inserts elements.
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
             * @param index zero-based index
             *
             * @example
             * ```ts
             * // insert element `10` at position 1 in the array
             * flatten({ scores: $push(10).$each().$position(1) });
             * ```
             */
            $position: (index: number) => Union<{
                /**
                 * Orders the elements of an array.
                 * @param value sort specification (default `1`)
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
                 *
                 * @example
                 * ```ts
                 * // sort ascending an array of numbers
                 * flatten({ scores: $push().$each().$sort(1) });
                 *
                 * // sort descending an array of numbers
                 * flatten({ scores: $push().$each().$sort(-1) });
                 *
                 * // sort ascending an array of documents with `name` field
                 * flatten({ users: $push().$each().$sort({ name: 1 }) });
                 * ```
                 */
                $sort: <S_1>(specification?: S_1 | undefined) => Union<unknown, unknown>;
            }, unknown>;
        }, {
            /**
             * Orders the elements of an array.
             * @param value sort specification (default `1`)
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
             *
             * @example
             * ```ts
             * // sort ascending an array of numbers
             * flatten({ scores: $push().$each().$sort(1) });
             *
             * // sort descending an array of numbers
             * flatten({ scores: $push().$each().$sort(-1) });
             *
             * // sort ascending an array of documents with `name` field
             * flatten({ users: $push().$each().$sort({ name: 1 }) });
             * ```
             */
            $sort: <S_2>(specification?: S_2 | undefined) => Union<{
                /**
                 * Specifies the location in the array at which the `$push` operator inserts elements.
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
                 * @param index zero-based index
                 *
                 * @example
                 * ```ts
                 * // insert element `10` at position 1 in the array
                 * flatten({ scores: $push(10).$each().$position(1) });
                 * ```
                 */
                $position: (index: number) => Union<unknown, unknown>;
            }, unknown>;
        }>;
        /**
         * Specifies the location in the array at which the `$push` operator inserts elements.
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
         * @param index zero-based index
         *
         * @example
         * ```ts
         * // insert element `10` at position 1 in the array
         * flatten({ scores: $push(10).$each().$position(1) });
         * ```
         */
        $position: (index: number) => Union<{
            /**
             * Orders the elements of an array.
             * @param value sort specification (default `1`)
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
             *
             * @example
             * ```ts
             * // sort ascending an array of numbers
             * flatten({ scores: $push().$each().$sort(1) });
             *
             * // sort descending an array of numbers
             * flatten({ scores: $push().$each().$sort(-1) });
             *
             * // sort ascending an array of documents with `name` field
             * flatten({ users: $push().$each().$sort({ name: 1 }) });
             * ```
             */
            $sort: <S_3>(specification?: S_3 | undefined) => Union<{
                /**
                 * Limits the number of array elements.
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
                 *
                 * @example
                 * ```ts
                 * // leave only the first 3 elements
                 * flatten({ grades: $push().$each().$slice(3) });
                 *
                 * // leave only the last element
                 * flatten({ grades: $push().$each().$slice(-1) });
                 *
                 * // empty the array
                 * flatten({ grades: $push().$each().$slice(0) });
                 * ```
                 */
                $slice: (count: number) => Union<unknown, unknown>;
            }, unknown>;
        }, {
            /**
             * Limits the number of array elements.
             * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
             *
             * @example
             * ```ts
             * // leave only the first 3 elements
             * flatten({ grades: $push().$each().$slice(3) });
             *
             * // leave only the last element
             * flatten({ grades: $push().$each().$slice(-1) });
             *
             * // empty the array
             * flatten({ grades: $push().$each().$slice(0) });
             * ```
             */
            $slice: (count: number) => Union<{
                /**
                 * Orders the elements of an array.
                 * @param value sort specification (default `1`)
                 * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
                 *
                 * @example
                 * ```ts
                 * // sort ascending an array of numbers
                 * flatten({ scores: $push().$each().$sort(1) });
                 *
                 * // sort descending an array of numbers
                 * flatten({ scores: $push().$each().$sort(-1) });
                 *
                 * // sort ascending an array of documents with `name` field
                 * flatten({ users: $push().$each().$sort({ name: 1 }) });
                 * ```
                 */
                $sort: <S_1>(specification?: S_1 | undefined) => Union<unknown, unknown>;
            }, unknown>;
        }>;
    };
};
/**
 * Limits the number of array elements.
 * Alias for `$push().$each().$slice()`.
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
 *
 * @example
 * ```ts
 * // leave only the first 3 elements
 * flatten({ grades: $slice(3) });
 *
 * // leave only the last element
 * flatten({ grades: $slice(-1) });
 *
 * // empty the array
 * flatten({ grades: $slice(0) });
 * ```
 */
export declare const $slice: (count: number) => Union<{
    /**
     * Specifies the location in the array at which the `$push` operator inserts elements.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
     * @param index zero-based index
     *
     * @example
     * ```ts
     * // insert element `10` at position 1 in the array
     * flatten({ scores: $push(10).$each().$position(1) });
     * ```
     */
    $position: (index: number) => Union<{
        /**
         * Orders the elements of an array.
         * @param value sort specification (default `1`)
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
         *
         * @example
         * ```ts
         * // sort ascending an array of numbers
         * flatten({ scores: $push().$each().$sort(1) });
         *
         * // sort descending an array of numbers
         * flatten({ scores: $push().$each().$sort(-1) });
         *
         * // sort ascending an array of documents with `name` field
         * flatten({ users: $push().$each().$sort({ name: 1 }) });
         * ```
         */
        $sort: <S>(specification?: S | undefined) => Union<unknown, unknown>;
    }, unknown>;
}, {
    /**
     * Orders the elements of an array.
     * @param value sort specification (default `1`)
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
     *
     * @example
     * ```ts
     * // sort ascending an array of numbers
     * flatten({ scores: $push().$each().$sort(1) });
     *
     * // sort descending an array of numbers
     * flatten({ scores: $push().$each().$sort(-1) });
     *
     * // sort ascending an array of documents with `name` field
     * flatten({ users: $push().$each().$sort({ name: 1 }) });
     * ```
     */
    $sort: <S_1>(specification?: S_1 | undefined) => Union<{
        /**
         * Specifies the location in the array at which the `$push` operator inserts elements.
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
         * @param index zero-based index
         *
         * @example
         * ```ts
         * // insert element `10` at position 1 in the array
         * flatten({ scores: $push(10).$each().$position(1) });
         * ```
         */
        $position: (index: number) => Union<unknown, unknown>;
    }, unknown>;
}>;
/**
 * Orders the elements of an array.
 * Alias for `$push().$each().$sort()`.
 * @param value sort specification (default `1`)
 * @see https://www.mongodb.com/docs/manual/reference/operator/update/sort/
 *
 * @example
 * ```ts
 * // sort ascending an array of numbers
 * flatten({ scores: $sort(1) });
 *
 * // sort descending an array of numbers
 * flatten({ scores: $sort(-1) });
 *
 * // sort ascending an array of documents with `name` field
 * flatten({ users: $sort({ name: 1 }) });
 * ```
 */
export declare const $sort: <S>(specification?: S) => Union<{
    /**
     * Limits the number of array elements.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
     *
     * @example
     * ```ts
     * // leave only the first 3 elements
     * flatten({ grades: $push().$each().$slice(3) });
     *
     * // leave only the last element
     * flatten({ grades: $push().$each().$slice(-1) });
     *
     * // empty the array
     * flatten({ grades: $push().$each().$slice(0) });
     * ```
     */
    $slice: (count: number) => Union<{
        /**
         * Specifies the location in the array at which the `$push` operator inserts elements.
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
         * @param index zero-based index
         *
         * @example
         * ```ts
         * // insert element `10` at position 1 in the array
         * flatten({ scores: $push(10).$each().$position(1) });
         * ```
         */
        $position: (index: number) => Union<unknown, unknown>;
    }, unknown>;
}, {
    /**
     * Specifies the location in the array at which the `$push` operator inserts elements.
     * @see https://www.mongodb.com/docs/manual/reference/operator/update/position/
     * @param index zero-based index
     *
     * @example
     * ```ts
     * // insert element `10` at position 1 in the array
     * flatten({ scores: $push(10).$each().$position(1) });
     * ```
     */
    $position: (index: number) => Union<{
        /**
         * Limits the number of array elements.
         * @see https://www.mongodb.com/docs/manual/reference/operator/update/slice/
         *
         * @example
         * ```ts
         * // leave only the first 3 elements
         * flatten({ grades: $push().$each().$slice(3) });
         *
         * // leave only the last element
         * flatten({ grades: $push().$each().$slice(-1) });
         *
         * // empty the array
         * flatten({ grades: $push().$each().$slice(0) });
         * ```
         */
        $slice: (count: number) => Union<unknown, unknown>;
    }, unknown>;
}>;
export {};