/**
 * @module Core
 */
/// <reference types="node" />
import { IOptions } from '../Contracts';
import { Group } from '../Group';
import { EventEmitter } from 'events';
/**
 * Runner class is used for defining global properties
 * and run all the tests inside the group.
 */
export declare class Runner<T extends any[], H extends any[]> {
    private _groups;
    private _options;
    private _reporterFn;
    constructor(_groups: Group<T, H>[], _options: IOptions);
    /**
     * Returns a boolean telling if any of the groups or it's tests
     * has errors.
     */
    get hasErrors(): boolean;
    /**
     * Define a set of test groups to use
     */
    useGroups(groups: Group<T, H>[]): this;
    /**
     * Define custom reporter
     */
    reporter(fn: (emitter: EventEmitter) => void): this;
    /**
     * Run all the tests inside the registered groups
     */
    run(): Promise<void>;
}