/**
 * Parses a human-readable duration string into milliseconds.
 *
 * Supported formats: `Xh`, `Xm`, `Xs`, and combinations like `1h30m`, `1h30m5s`.
 *
 * @returns Duration in milliseconds
 * @throws When the string does not match any supported format
 *
 * @private internal utility of `ptbk coder run`
 */
export declare function parseDuration(durationString: string): number;
/**
 * Formats a duration in milliseconds into a compact human-readable string.
 *
 * Examples: `3600000` → `"1h"`, `90000` → `"1m 30s"`, `5000` → `"5s"`.
 *
 * @private internal utility of `ptbk coder run`
 */
export declare function formatDurationMs(ms: number): string;