import { ConfigType } from 'dayjs';
/**
 * Number formatter instance configured for US locale with no minimum fraction digits
 */
export declare const NUMBER_FORMAT: Intl.NumberFormat;
/**
 * Formats a number using US locale formatting
 * @param n - Number to format
 * @returns Formatted number string
 * @example
 * ```ts
 * formatNumber(1234567.89); // "1,234,568"
 * ```
 */
export declare const formatNumber: (n: number) => string;
/**
 * Returns local date string as  `YYYY-MM-DD HH:mm`
 * 24-hour format, hours and mins only
 *
 * @param d
 * @returns
 */
export declare const formatDateTimeSimple: (d?: Date) => string;
/**
 * Formats a date into a human-readable datetime string
 * @param d - Date to format (can be Date object, timestamp number, or bigint)
 * @returns Formatted string in "Day YYYY-MM-DD HH:MM AM/PM" format
 * @example
 * ```ts
 * formatDateTime(new Date()); // e.g., "Wed 2024-03-13 02:30 PM"
 * ```
 */
export declare const formatDateTime: (d: Date | number | bigint) => string;
/**
 * Formats a date into YYYY-MM-DD format
 * @param d - Date to format (can be Date object, timestamp number, or bigint)
 * @returns Formatted date string
 * @example
 * ```ts
 * formatDate(new Date()); // e.g., "2024-03-13"
 * ```
 */
export declare const formatDate: (d: Date | number | bigint) => string;
/**
 * Formats a date into time of day (HH:MM AM/PM)
 * @param d - Date to format (can be Date object, timestamp number, or bigint)
 * @returns Formatted time string
 * @example
 * ```ts
 * formatTimeOfDay(new Date()); // e.g., "02:30 PM"
 * ```
 */
export declare const formatTimeOfDay: (d: Date | number | bigint) => string;
/**
 * Formats a date relative to the current time (e.g., "2 hours ago", "in 3 days")
 * @param d - Date to format (accepts any dayjs ConfigType)
 * @returns Human-readable relative time string
 * @example
 * ```ts
 * formatTimeRelative(new Date(Date.now() - 3600000)); // "1 hour ago"
 * ```
 */
export declare const formatTimeRelative: (d: ConfigType) => string;
/**
 * Formats the current timestamp for use in filenames (filesystem-safe)
 * @returns Timestamp string in YYYY-MM-DDTHH-mm-ss format
 * @example
 * ```ts
 * formatTimestampForFilename(); // "2024-03-13T14-30-25"
 * ```
 */
export declare const formatTimestampForFilename: () => string;
/**
 * Formats a duration in milliseconds into a compact human-readable string.
 * @param ms - Duration in milliseconds
 * @returns Compact duration string like "3s", "14m 49s", "1h 2m 3s"
 * @example
 * ```ts
 * formatShortDuration(889000); // "14m 49s"
 * formatShortDuration(3000);   // "3s"
 * formatShortDuration(3723000); // "1h 2m 3s"
 * ```
 */
export declare function formatShortDuration(ms: number): string;
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