import { Schema } from 'mongoose';
import { IKeywordOptions } from './interfaces';
/**
 * Add keyword generation for a given schema
 *
 * @description
 * Automatically generates keywords from the specified local and virtual paths and persists
 * them into a new `__keywords` field.
 *
 * @usage
 * Pass an object with the following options to configure the behavior of keyword generation.
 *
 * Available options are:
 *  - `paths`: a collection of the local schema paths to generate keywords from
 *  - `virtuals`: a map of virtual paths to be populated and generate keywords from
 *  - `omit`: a collection of words to be omitted from the resulting keywords
 *
 * @remarks
 * Keywords will be generated automatically when creating a new document or updating an existing
 * one via `findOneAndUpdate`
 */
export declare const KeywordsMiddleware: (schema: Schema, options: IKeywordOptions) => void;