import { z } from 'zod';
import { Problem } from '../problem.js';
export type ProblemMatcher = z.ZodType<Problem> | ((problem: Problem) => boolean);
export declare function nullifyNotFound<T>(promise: Promise<T>): Promise<T | null>;
export declare function nullifyProblem<T>(promise: Promise<T>, statuses: number[], problemTypes: ProblemMatcher[]): Promise<T | null>;