/**
 * Transforms sort parameter to array of strings format expected by GraphQL schema.
 * Handles two input formats:
 * 1. Object format: {createdOn: "desc"} -> ["createdOn_DESC"]
 * 2. Array of strings: ["createdOn_DESC"] -> ["createdOn_DESC"] (pass through)
 *
 * @param sort - Sort parameter (object or array of strings)
 * @returns Array of strings in format ["field_ASC"|"field_DESC"] or undefined if no sort provided
 *
 * @example
 * transformSortToArray({createdOn: "desc"})
 * // Returns: ["createdOn_DESC"]
 *
 * @example
 * transformSortToArray(["createdOn_DESC", "name_ASC"])
 * // Returns: ["createdOn_DESC", "name_ASC"]
 */
export declare const transformSortToArray: (sort?: Record<string, unknown> | string[]) => string[] | undefined;