/**
 * prettyTime options
 * - withSpaces Whether to use spaces to separate times, `1d2h3m5s` or `1d 2h 3m 5s`, default false
 * - toFixedVal value pass to toFixed for seconds, default 1
 * - longFormat Whether to use a long format, default false, `1d2h3m5s` or `1days 2hours 3minutes 5seconds`
 */
export interface prettyTimeOptions {
    withSpaces?: boolean;
    toFixedVal?: number;
    longFormat?: boolean;
}
/**
 * Convert time duration to a human readable string: 5d1h20m30s
 *
 * - milliseconds The number to format, unit milliseconds
 */
export declare function prettyTime(milliseconds: number, options?: prettyTimeOptions): string;
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