/**
 * Internal Event Bus for DiagView
 * Lightweight pub/sub to decouple modules and avoid circular dependencies.
 */
/**
 * Lightweight Internal Event Bus for DiagView
 * Functional implementation to reduce architectural bloat.
 */
export function EventEmitter(): {
    on(event: any, callback: any): () => void;
    off(event: any, callback: any): void;
    emit(event: any, data: any): void;
    clear(): void;
};
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