/**
 * Folder tree builder — converts a flat NativeFolder[] into a nested tree.
 * Equivalent to imapflow's listTree(), but pure JS and transport-agnostic.
 * Parents are derived from path + delimiter (NativeFolder has no pre-parsed parent[]).
 */
import type { NativeFolder } from "./imap-native.js";
export interface FolderTreeNode {
    /** Root sentinel — only true on the returned top-level container */
    root?: boolean;
    /** Full mailbox path (empty string for root) */
    path: string;
    /** Leaf name (last segment of path) */
    name: string;
    /** Path delimiter from the server */
    delimiter: string;
    /** IMAP flags (e.g. "\\HasChildren", "\\Noselect", "\\Inbox") */
    flags: string[];
    /** Detected special-use tag (sent/trash/drafts/spam/archive/inbox), if known */
    specialUse?: string;
    /** True if the folder itself cannot be selected (e.g. "\\Noselect" flag) */
    disabled?: boolean;
    /** Child folders */
    folders: FolderTreeNode[];
}
/** Build a nested tree from a flat folder list using path + delimiter. */
export declare function buildFolderTree(folders: NativeFolder[]): FolderTreeNode;
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