/**
 * Lightweight browser-compatible event emitter.
 * Provides publish/subscribe functionality for MIDI events
 * without external dependencies. Implements standard event
 * emitter pattern: register listeners with on(), emit events
 * with emit(), remove listeners with off(). Listener cleanup
 * is automatic via returned unsubscribe functions.
 */
export class EventEmitter {
    events: Map<any, any>;
    /**
     * Register an event listener
     * @param {string} event - Event name
     * @param {Function} handler - Event handler function
     * @returns {Function} Unsubscribe function
     */
    on(event: string, handler: Function): Function;
    /**
     * Register a one-time event listener
     * @param {string} event - Event name
     * @param {Function} handler - Event handler function
     */
    once(event: string, handler: Function): void;
    /**
     * Remove an event listener
     * @param {string} event - Event name
     * @param {Function} handler - Event handler function
     */
    off(event: string, handler: Function): void;
    /**
     * Emit an event
     * @param {string} event - Event name
     * @param {*} data - Event data
     */
    emit(event: string, data: any): void;
    /**
     * Remove all event listeners
     * @param {string} [event] - Optional event name to clear specific event
     */
    removeAllListeners(event?: string): void;
}
//# sourceMappingURL=EventEmitter.d.ts.map