import { TokenType } from "./types";
export type GetListenersFn<F extends CallableFunction> = () => F[];
export declare class Subscribable<F extends CallableFunction> {
    private listenerMap;
    private _listeners;
    private proxyMap;
    private proxies;
    get listeners(): F[];
    /**
     * Subscribe to the event / hook
     * @param token A token that can be used to unsubscribe from the event / hook later on
     * @param callback A callback that will be invoked when the event / hook occurs
     */
    subscribe(token: TokenType, callback: F): void;
    /**
     * Remove a listener
     * @param token The token that was specified when subscribing to the listener.
     * An invalid token does not result in an error.
     */
    unsubscribe(token: TokenType): void;
    /** This function is only used internally for proxies */
    registerProxy(token: TokenType, getListeners: GetListenersFn<F>): void;
    /** This function is only used internally for proxies */
    unregisterProxy(token: TokenType): void;
}