/**
 * Lightweight typed event emitter with zero dependencies.
 *
 * Usage:
 * ```ts
 * interface MyEvents {
 *   'foo': [x: number, y: string];
 *   'bar': [];
 * }
 * const emitter = new EventEmitter<MyEvents>();
 * emitter.on('foo', (x, y) => console.log(x, y));
 * emitter.emit('foo', 42, 'hello');
 * ```
 */
export declare class EventEmitter<TEvents extends Record<string, unknown[]>> {
    private _listeners;
    on<K extends keyof TEvents>(event: K, fn: (...args: TEvents[K]) => void, context?: unknown): this;
    once<K extends keyof TEvents>(event: K, fn: (...args: TEvents[K]) => void, context?: unknown): this;
    off<K extends keyof TEvents>(event: K, fn?: (...args: TEvents[K]) => void, context?: unknown): this;
    emit<K extends keyof TEvents>(event: K, ...args: TEvents[K]): boolean;
    private _removeEntry;
    removeAllListeners(event?: keyof TEvents): this;
    listenerCount(event: keyof TEvents): number;
    private _add;
}
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