import type { CollectionBeforeOperationHook } from 'payload';
/**
 * Normalizes a filename: slugifies the NAME part (diacritics, spaces, case)
 * while preserving the extension. Keeps uploaded media URLs clean and portable.
 *
 *   "Zdjęcie jeden nad morzem.jpg"  → "zdjecie-jeden-nad-morzem.jpg"
 *   "Faktura #12 (2024).PDF"        → "faktura-12-2024.pdf"
 *   "already-clean.webp"            → "already-clean.webp"
 *
 * Why not toSlug(): toSlug uses strict:true, which would strip the dot and
 * merge name+extension. Here we split on the LAST dot, slug the stem, lowercase
 * the extension, and rejoin.
 */
export declare function normalizeFilename(filename: string): string;
/**
 * beforeOperation hook for an upload collection (e.g. Media). Rewrites the
 * incoming file's name to its normalized form before Payload stores it, so both
 * the stored file and its DB filename are clean. Works with local disk and with
 * cloud storage adapters (R2/S3) — it runs before the storage layer.
 *
 * Wire into your Media collection:
 *   import { normalizeFilenameHook } from '@intecion/ipal-kit'
 *   hooks: { beforeOperation: [normalizeFilenameHook] }
 */
export declare const normalizeFilenameHook: CollectionBeforeOperationHook;