import type { EventHandler } from '../types/plugin';
/**
 * Internal event bus for the editor.
 * Supports multiple handlers per event and cancellable events.
 */
export declare class EventBus {
    private listeners;
    on(event: string, handler: EventHandler): void;
    off(event: string, handler: EventHandler): void;
    emit(event: string, data?: unknown): boolean;
    destroy(): void;
}
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