import type { ParseContext, ParseFail } from '../types.ts';
/**
 * Creates a ParseFail and, if a completions probe is active, records it.
 *
 * Rules:
 * - Only failures at or before the probe's target offset are eligible.
 * - A deeper failure (higher pos) replaces the current best.
 * - A tie (same pos) merges expected arrays — this is what makes choice arms
 *   aggregate their alternatives rather than each overwriting the last.
 * - Shallower failures are ignored.
 */
export declare function failAt(ctx: ParseContext, expected: string[], pos: number): ParseFail;
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