/**
 * Validation for the positional index syntax of `mask="…"` — see
 * docs/specs/2026-07-23-mask-positional-reordering.md.
 *
 * A mask is lenient everywhere else on purpose: too few characters simply leave
 * a slot empty, because the input length is unknown until render time. A
 * malformed INDEX is a different thing — it is a typo, most likely `x[1-2]`
 * written from habit, and left alone it would abort mid-render with no position
 * to point at. Catching it here costs one parse of a string that is already
 * known at validation time.
 */
import { type Diagnostic } from '../errors/index.js';
import type { OpenCloseElementContext, SelfClosingElementContext } from '../generated/TDCParser.js';
export declare function checkGenMask(gen: OpenCloseElementContext | SelfClosingElementContext, diagnostics: Diagnostic[]): void;
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