/**
 * Formats a duration in milliseconds to a human-friendly string.
 *
 * - 0ms        → "0s"
 * - <1s        → "<1s"
 * - <60s       → "Xs"
 * - <1h        → "Xm Ys"
 * - ≥1h        → "Xh Ym" (seconds omitted)
 */
export declare function formatDuration(ms: number): string;
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