/**
 * Pad a string to the specified length
 */
export declare function pad(str0: string | number, ch: string, len: number): string;
/**
 * Converts milliseconds to a formatted timestamp string
 * @param v - Milliseconds to convert (can be negative)
 * @param format - Format string with placeholders
 * @returns Formatted timestamp string
 */
export declare function msToStamp(v: number, format: string): string;
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