/**
 * `squad update-check` — expose cached CLI update status for tooling.
 *
 * Reads the update-check cache maintained by self-update.ts and reports it
 * as human-readable text or structured JSON (--json). This gives editor
 * extensions, coordinator instructions, and CI scripts a stable interface
 * to query update status without replicating OS-specific cache path
 * resolution or TTL freshness checks themselves.
 *
 * @module cli/commands/update-check
 */
import { type ReleaseChannel } from '../upgrade.js';
export interface UpdateCheckResult {
    current: string;
    channel: ReleaseChannel;
    latest: string | null;
    updateAvailable: boolean;
    cacheAge: string | null;
    checkedAt: string | null;
    error?: string;
}
/** Detect release channel from a version's prerelease tag (e.g. "insider.2" → "insider"). */
export declare function detectChannel(version: string): ReleaseChannel;
/** Format a millisecond duration as an ISO 8601 duration string (e.g. "PT2H15M"). */
export declare function formatCacheAge(ms: number): string;
/**
 * Build the update-check result for the given current version.
 *
 * Without `refresh`, only reads the existing cache — never makes a network
 * call. With `refresh`, always re-fetches from the npm registry and updates
 * the cache.
 */
export declare function runUpdateCheck(currentVersion: string, options?: {
    refresh?: boolean;
}): Promise<UpdateCheckResult>;
/**
 * CLI entry point for `squad update-check`.
 * @returns the process exit code: 0 (up to date / no cache yet),
 *   1 (update available), 2 (transport failure during --refresh).
 */
export declare function runUpdateCheckCommand(args: string[]): Promise<number>;
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