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- /**
- * Represent a duration in seconds as a string
- *
- * @param value A finite number, or its string representation
- * @return Includes one or two `:` separators, and matches the pattern
- * `hhhh:mm:ss`, possibly with a leading `-` for negative values and a
- * trailing `.sss` part for non-integer input
- *
- * @example
- * ```js
- * var mf = new MessageFormat();
- *
- * mf.compile('It has been {D, duration}')({ D: 123 })
- * // 'It has been 2:03'
- *
- * mf.compile('Countdown: {D, duration}')({ D: -151200.42 })
- * // 'Countdown: -42:00:00.420'
- * ```
- */
- export declare function duration(value: number | string): string;
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