/**
 * Convert number value of second to MM:SS string.
 */
export declare function secToMmss(seconds: number): string;
/**
 * Convert number value of minute to HH:MM:SS string.
 */
export declare function minToHhmmss(minutes: number): string;
/**
 * Convert number value of second to MM:SS.SSS string.
 */
export declare function secToMmssms(seconds: number): string;
/**
 * Convert MM:SS string to number value of second.
 */
export declare function mmssToSec(mmss: string): number;
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