/**
 * @param {string | null | undefined} dateStr
 * @returns {string}
 */
export function formatTime(dateStr: string | null | undefined): string;
/**
 * @param {string | null | undefined} startStr
 * @param {string | null | undefined} endStr
 * @param {number | null | undefined} totalMs
 * @returns {string}
 */
export function formatDuration(startStr: string | null | undefined, endStr: string | null | undefined, totalMs: number | null | undefined): string;
/**
 * @param {string} phase
 * @returns {string}
 */
export function formatPhase(phase: string): string;
/**
 * @param {number} timestamp
 * @returns {string}
 */
export function formatLogTime(timestamp: number): string;
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