import { MaybePromise } from '@mtcute/core';
import { UpdateFilter } from './types.js';
/**
 * Create a filter for the cases when the state is empty
 */
export declare const stateEmpty: UpdateFilter<any>;
/**
 * Create a filter based on state predicate
 *
 * If state exists and matches `predicate`, update passes
 * this filter, otherwise it doesn't
 *
 * @param predicate  State predicate
 */
export declare function state<T extends object>(predicate: (state: T) => MaybePromise<boolean>): UpdateFilter<any, {}, T>;