/**
 * time-utils.ts — Human-readable duration formatting for Ralph run stats.
 */
/**
 * Formats a duration in milliseconds into a compact human-readable string.
 *
 * Thresholds:
 * - ms < 1000   → "<1s"
 * - ms < 60000  → "Xs"          (e.g. "45s")
 * - ms < 3600000 → "Xm Ys"      (e.g. "4m 32s")
 * - otherwise   → "Xh Ym Zs"   (e.g. "1h 23m 45s")
 *
 * Zero-second/minute components are included (e.g. "1m 0s", "1h 0m 5s").
 *
 * @param ms - Duration in milliseconds (must be >= 0)
 * @returns Human-readable duration string
 */
export declare function formatDuration(ms: number): string;
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