import { type LucideIcon } from 'lucide-react';
import type { FileManagerItem } from './types';
export declare function formatFileSize(bytes: number, locale: string, t: (key: string, fallback: string) => string): string;
/** Icon component per item — folders first, then a MIME-family lookup. */
export declare function getItemIcon(item: FileManagerItem): LucideIcon;
/** Children of a folder, folders first, then locale-aware by name. */
export declare function childrenOf(items: FileManagerItem[], folderId: string | null, locale: string): FileManagerItem[];
/**
 * Every item whose ancestry passes through `folderId` (folders + files, any
 * depth) — the full subtree beneath a folder, excluding the folder itself.
 * Feeds AG Grid Tree Data when `groupByFolder` is on (the flat `childrenOf`
 * only returns the immediate level). Sort order matches `childrenOf` — folders
 * first, then locale-aware by name — so sibling order is stable at every depth.
 */
export declare function descendantsOf(items: FileManagerItem[], folderId: string | null, locale: string): FileManagerItem[];
/**
 * AG Grid Tree Data path for an item: the id-chain from the current folder's
 * direct child down to (and including) the item. Walk `parentId` up, stopping
 * at `currentFolderId` (exclusive), then reverse and append the item's own id.
 * Every returned id is a real folder/file row, so AG Grid never synthesises
 * filler group rows. `itemsById` need only cover the current subtree.
 */
export declare function pathWithinFolder(item: FileManagerItem, itemsById: Map<string, FileManagerItem>, currentFolderId: string | null): string[];
/** Path from the root down to `folderId` (exclusive of the virtual root). */
export declare function pathTo(items: FileManagerItem[], folderId: string | null): FileManagerItem[];
/**
 * Ids of the given folders plus every folder nested inside them. Used to
 * exclude invalid targets from the move-destination tree (a folder can never
 * be moved into itself or one of its descendants).
 */
export declare function withDescendantFolderIds(items: FileManagerItem[], ids: string[]): Set<string>;
/** True when the two id lists contain the same set of ids. */
export declare function sameIdSet(a: string[], b: string[]): boolean;
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