/**
 * Slack files command — crewx slack:files [--thread <thread_ts>] [--list] [--clean]
 *
 * Ported 1:1 from packages/cli-bak/src/cli/slack-files.handler.ts.
 * Implements download/list/clean operations without NestJS or @slack/web-api.
 * Uses Node.js built-in https and fetch for Slack API calls.
 */
/**
 * Handle `crewx slack` / `crewx slack:files` commands.
 * Subcommand is determined by flags: --list → list, --clean → clean, default → download.
 */
export declare function handleSlack(args: string[]): Promise<void>;