/**
 * Encode a duration in seconds to an ISO 8601 duration string.
 *
 * @param duration - Duration in seconds.
 * @returns ISO 8601 duration string.
 *
 * @group ISO 8601
 * @beta
 *
 * @example
 * {@includeCode ../../../test/iso/8601/encodeIso8601Duration.test.ts#example}
 */
export declare function encodeIso8601Duration(duration: number): string;
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