/**
 * Representation of a single event listener.
 *
 * @param {Function} fn The listener function.
 * @param {*} context The context to invoke the listener with.
 * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
 */
export declare class ESMitterListener {
    fn: () => unknown;
    context: unknown;
    once: boolean;
    constructor(fn: () => unknown, context: unknown, once?: boolean);
}