import Emittery, { UnsubscribeFunction } from 'emittery';
import { type FrameworkEvents } from '../types.js';
/**
 * Runner emitter
 */
export declare class Emitter<Events = FrameworkEvents> extends Emittery<Events> {
    #private;
    /**
     * Define onError handler invoked when `emit` fails
     * @param errorHandler - The error handler to call when an error is emitted
     */
    onError(errorHandler: (error: any) => void | Promise<void>): void;
    /**
     * Override Emittery's `on` to unwrap the `{ name, data }` payload that Emittery v1 passes.
     * Japa reporters expect the raw data object, not the wrapped one.
     */
    on<Name extends keyof Events>(eventName: Name | readonly Name[], listener: (eventData: Events[Name]) => void | Promise<void>): UnsubscribeFunction;
    /**
     * Emit event
     */
    emit<Name extends keyof Events>(eventName: Name, eventData?: Events[Name], allowMetaEvents?: boolean): Promise<void>;
}