import type { Argv } from 'yargs';
/**
 * Register a subcommand with auto-enriched description.
 * Replays the builder on a probe yargs instance to discover demandOption fields,
 * then appends required flag names to the description so parent help shows them.
 *
 * Note: enrichment targets the description, not the command string, because yargs
 * interprets `<...>` in command strings as required positional arguments.
 */
export declare function registerSubcommand<T>(parentYargs: Argv<T>, usage: string, description: string, builder: (y: Argv) => Argv, handler: (argv: any) => Promise<void>): Argv<T>;