/**
 * Fallback target for owner-facing Slack notifications.
 *
 * `SlackService.sendNotification` needs a channel. Installs that never set
 * `SLACK_DEFAULT_CHANNEL` (steamfun-ops, 2026-09-18) silently dropped every
 * notification — including the OKR approval nudge — with "No channel
 * configured". The owner has, however, already talked to the orchestrator
 * somewhere: each Slack conversation leaves a directory under
 * `~/.crewly/slack-threads/<channelId>/`. The most recently active one is
 * where the owner is, so that is where a notification without an explicit
 * channel goes. Direct-message channels (`D…`) win over public channels when
 * both were used within the same window, because a nudge is for the owner,
 * not the team.
 *
 * @module services/slack/slack-notification-fallback
 */
/**
 * Pick the channel the owner most recently used, from the thread store.
 *
 * @param threadsDir - Override of `~/.crewly/slack-threads` (tests)
 * @returns A Slack channel id, or null when the store is empty or missing
 *
 * @example
 * ```ts
 * const channel = notification.channelId ?? config.defaultChannelId ?? resolveFallbackNotificationChannel();
 * ```
 */
/**
 * Candidate channels for an owner notification, best first: DMs before
 * channels, most recently used first. Conversations the master bot cannot
 * post into are excluded via `exclude` (an agent's own DM belongs to that
 * agent's app; posting there as the master bot fails with channel_not_found).
 *
 * @param threadsDir - Thread store dir (default `<CREWLY_HOME>/slack-threads`)
 * @param exclude - Channel ids to skip
 * @returns Ordered candidates (possibly empty)
 */
export declare function resolveFallbackNotificationChannels(threadsDir?: string, exclude?: (id: string) => boolean): string[];
export declare function resolveFallbackNotificationChannel(threadsDir?: string): string | null;
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