export interface SessionDirectorySource<T> {
    entry: T;
    cwd: string;
    sortTimestamp: number;
}
export interface SessionDirectoryNode<T> {
    /** Exact path used when starting a new session. Empty only for the synthetic unknown group. */
    path: string;
    /** Compact path segment label. Single-child ancestors are folded into this label. */
    name: string;
    /** User-defined workspace label. Clients display this in preference to name. */
    customName?: string;
    synthetic: boolean;
    /** Sessions whose cwd is exactly this node. */
    directCount: number;
    /** Sessions at this node or any descendant node. */
    totalCount: number;
    latestTimestamp: number;
    entries: T[];
    children: SessionDirectoryNode<T>[];
}
export interface SessionDirectoryTree<T> {
    roots: SessionDirectoryNode<T>[];
    totalSessions: number;
    /** Number of distinct real working directories, excluding ancestor-only and unknown nodes. */
    directoryCount: number;
}
export declare function normalizeSessionDirectory(value: string): string;
export declare function buildDirectoryTree<T>(sources: readonly SessionDirectorySource<T>[], unknownLabel?: string, customNames?: ReadonlyMap<string, string>): SessionDirectoryTree<T>;