import { Document, Schema } from 'mongoose';
/**
 * Enhances a Mongoose schema by adding virtual fields for computed values.
 *
 * This function inspects the schema's definition for special tracking arrays
 * (such as `_viewedBy` or `_likedBy`). If those arrays exist, it adds
 * corresponding virtual properties (`views` and `likes`) to the schema.
 * These virtuals provide a clean way to access the number of views or likes
 * without needing to calculate them manually each time.
 *
 * @template T - A type extending the Mongoose Document interface.
 * @param {Schema<T>} schema - The Mongoose schema to augment with virtuals.
 * @returns {void} - Modifies the schema in place; no return value.
 */
export declare function addViewsLikesVirtuals<T extends Document>(schema: Schema<T>): void;