/**
 * OpenKernel — Event Bus
 *
 * Everything emits events. Plugins subscribe.
 */
import type { EventHandler, KernelEvent, KernelEventType } from './types.js';
export declare class EventBus {
    private handlers;
    private wildcardHandlers;
    private history;
    private maxHistory;
    on(types: KernelEventType[], handler: EventHandler): () => void;
    onAll(handler: EventHandler): () => void;
    emit(event: KernelEvent): void;
    private invoke;
    private emitSafe;
    getHistory(): KernelEvent[];
    clearHistory(): void;
}