/**
 * Counter generators: `<gen type="increment" [value="N"] [step="M"]/>`
 * and `<gen type="decrement" [value="N"] [step="M"]/>`.
 *
 * `increment` starts at `value` (default 0) and adds `step` (default 1)
 * for each cell. `decrement` is the symmetric complement. Both ignore
 * the prng; counters are deterministic by position regardless of seed.
 *
 * Output is the string form of the integer (no padding, no leading
 * zeros). Future phases may add `length` / `first_zero` if a fixture
 * demands it.
 */
import type { Generator } from './generator.js';
export interface CounterAttrs {
    readonly start?: number | undefined;
    readonly step?: number | undefined;
}
export declare function incrementGenerator(attrs?: CounterAttrs): Generator;
export declare function decrementGenerator(attrs?: CounterAttrs): Generator;
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