/**
 * Map a file name to its XP icon key based on extension and node type.
 * Falls back to the provided explicit icon, then to type-aware defaults.
 */
export declare function getFileIconName(fileName: string, nodeType?: 'file' | 'folder' | 'drive' | 'app_shortcut' | 'root' | 'external_link', explicitIcon?: string): string;