/**
 * Detect a deterministic series in `categories` and return the next value.
 *
 * Conservative: any ambiguity (mixed formats, fewer than 2 entries, no constant
 * step, non-monotonic) falls back to `Category N+1`. Wrong guesses are worse
 * than no guess.
 *
 * Footnote markers (`{1}`, `{2}`, …) are stripped before detection, since they
 * are display-only annotations and the raw category drives the pattern.
 *
 * Detector order — most specific first, generic last:
 *   1. `MM/YYYY` — month/year with year carry-over
 *   2. `YYYY-MM` — ISO-ish year-month
 *   3. Month names in en/de/fr/it (with cyclic wrap-around)
 *   4. Integer arithmetic progression (any constant step ≠ 0)
 *
 * Returns a single string suitable for the new category cell.
 */
export declare function nextCategoryValue(categories: string[]): string;