/**
 * Parse an interval string like "1-15, 18, 20-25" into a flat array of numbers.
 *
 * Invalid segments are ignored. The result is deduplicated and sorted ascending.
 */
export declare const parseIntervalString: (value?: string) => number[];
/**
 * Return the invalid segments of an interval string.
 *
 * A segment is invalid when it is not a number or a range (e.g. "abc", "1--5"),
 * or when the range is reversed (e.g. "15-1").
 */
export declare const getInvalidIntervalParts: (value?: string) => string[];
/**
 * Return an error message when any parsed value is outside the given min/max bounds.
 */
export declare const getRangeErrorMessage: (value: string, min?: number, max?: number) => string | undefined;
/**
 * Format an array of numbers into an interval string.
 *
 * Example: [1, 2, ..., 15, 18, 20, ..., 25] becomes "1-15, 18, 20-25".
 */
export declare const formatNumberArrayToIntervalString: (value?: number[]) => string;