import { type ReadonlyDeep } from "type-fest";
import { type RuleContext } from "./rule";
/**
 * Rule output is immutable, do not modify existing items, only append using this function.
 */
export declare function appendOutput<TInput, TOutput>(context: RuleContext<TInput, TOutput>, output: ReadonlyDeep<TOutput>): RuleContext<TInput, TOutput>;