/**
 * Decode an ISO 8601 duration string into seconds.
 *
 * @param isoDuration - ISO 8601 duration string.
 * @returns Duration in seconds.
 *
 * @group ISO 8601
 * @beta
 *
 * @example
 * {@includeCode ../../../test/iso/8601/decodeIso8601Duration.test.ts#example}
 */
export declare function decodeIso8601Duration(isoDuration: string): number;
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