export declare const isFileSystemFileEntry: (entry: FileSystemEntry) => entry is FileSystemFileEntry;
export declare const isFileSystemDirectoryEntry: (entry: FileSystemEntry) => entry is FileSystemDirectoryEntry;
export type FolderGroup = {
    /** The subfolder name, or an empty string for files sitting at the dropped folder's root. */
    folderName: string;
    files: File[];
};
export declare const sortFolderGroups: (groups: FolderGroup[]) => FolderGroup[];
export declare const readDirectoryFiles: (directoryEntry: FileSystemDirectoryEntry) => Promise<File[]>;
/**
 * Groups already-collected files (e.g. from a `webkitdirectory` folder picker) by their top-most
 * subfolder, mirroring {@link readDirectoryFolders}. Grouping uses each file's
 * `webkitRelativePath`, whose first segment is the picked folder itself:
 *
 * - Files under an immediate subfolder are grouped under that subfolder's name (deeper nesting is
 *   flattened into it).
 * - Files sitting directly in the picked folder go into a trailing group with an empty
 *   `folderName` (a default, unnamed section).
 *
 * Expects the input to already be filtered to accepted file types.
 */
export declare const groupFilesBySubfolder: (files: File[]) => FolderGroup[];
/**
 * The picked folder's own name: the first segment of the same `webkitRelativePath` format
 * {@link groupFilesBySubfolder} groups by, so it is the picked folder whether its files sit at that
 * folder's root or deeper. Undefined for files carrying no relative path, which is what a drop
 * produces.
 */
export declare const getRootFolderName: (files: File[]) => string | undefined;
/**
 * Reads a dropped directory and groups its files by top-level subfolder, so a batch can be laid
 * out as one section per subfolder.
 *
 * - Each immediate subfolder becomes a group named verbatim after it, containing every accepted
 *   file found recursively within it (flattened).
 * - Accepted files sitting directly in the dropped folder are returned in a trailing group with an
 *   empty `folderName` (a default, unnamed section).
 * - Empty subfolders (no accepted file anywhere inside) are skipped.
 */
export declare const readDirectoryFolders: (directoryEntry: FileSystemDirectoryEntry) => Promise<FolderGroup[]>;
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