import type { Document } from '../bson';
import type { Collection } from '../collection';
import type { Server } from '../sdam/server';
import type { ClientSession } from '../sessions';
import { Callback } from '../utils';
import { CommandOperation, CommandOperationOptions } from './command';
/** @public */
export declare type DistinctOptions = CommandOperationOptions;
/**
 * Return a list of distinct values for the given key across a collection.
 * @internal
 */
export declare class DistinctOperation extends CommandOperation<any[]> {
    options: DistinctOptions;
    collection: Collection;
    /** Field of the document to find distinct values for. */
    key: string;
    /** The query for filtering the set of documents to which we apply the distinct filter. */
    query: Document;
    /**
     * Construct a Distinct operation.
     *
     * @param collection - Collection instance.
     * @param key - Field of the document to find distinct values for.
     * @param query - The query for filtering the set of documents to which we apply the distinct filter.
     * @param options - Optional settings. See Collection.prototype.distinct for a list of options.
     */
    constructor(collection: Collection, key: string, query: Document, options?: DistinctOptions);
    execute(server: Server, session: ClientSession | undefined, callback: Callback<any[]>): void;
}
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