/**
 * Return an array of ISO PlainDate strings between `startDate` and `endDate` inclusive.
 *
 * - Generates dates with optional step (default 1 day).
 * - Returns [] if start > end, invalid inputs, or step <= 0.
 *
 * @param startDate ISO PlainDate string for the first date
 * @param endDate ISO PlainDate string for the last date (inclusive)
 * @param stepDays optional number of days to step between results
 * @returns array of ISO PlainDate strings, or [] on invalid input
 *
 * @example mapDatesInRange("2024-03-01", "2024-03-05") // ["2024-03-01", "2024-03-02", "2024-03-03", "2024-03-04", "2024-03-05"]
 * @example mapDatesInRange("2024-03-01", "2024-03-05", 2) // ["2024-03-01", "2024-03-03", "2024-03-05"]
 * @example mapDatesInRange("2024-03-05", "2024-03-01") // []
 * @example mapDatesInRange("invalid", "2024-03-05") // []
 * @example mapDatesInRange("2024-03-01", "invalid") // []
 * @example mapDatesInRange("2024-03-01", "2024-03-05", 0) // []
 */
export declare function mapDatesInRange(startDate: string, endDate: string, ...stepDaysInput: [stepDays?: number]): string[];