import { AmplifyChannel, AmplifyEventData, EventDataMap, HubCallback, HubPayload, StopListenerCallback } from './types';
export declare const AMPLIFY_SYMBOL: symbol;
export declare class HubClass {
    name: string;
    private listeners;
    protectedChannels: string[];
    constructor(name: string);
    /**
     * Used internally to remove a Hub listener.
     *
     * @remarks
     * This private method is for internal use only. Instead of calling Hub.remove, call the result of Hub.listen.
     */
    private _remove;
    /**
     * Used to send a Hub event.
     *
     * @param channel - The channel on which the event will be broadcast
     * @param payload - The HubPayload
     * @param source  - The source of the event; defaults to ''
     * @param ampSymbol - Symbol used to determine if the event is dispatched internally on a protected channel
     *
     */
    dispatch<Channel extends AmplifyChannel>(channel: Channel, payload: HubPayload<AmplifyEventData[Channel]>, source?: string, ampSymbol?: symbol): void;
    dispatch(channel: string, payload: HubPayload, source?: string, ampSymbol?: symbol): void;
    /**
     * Used to listen for Hub events.
     *
     * @param channel - The channel on which to listen
     * @param callback - The callback to execute when an event is received on the specified channel
     * @param listenerName - The name of the listener; defaults to 'noname'
     * @returns A function which can be called to cancel the listener.
     *
     */
    listen<Channel extends AmplifyChannel>(channel: Channel, callback: HubCallback<Channel, AmplifyEventData[Channel]>, listenerName?: string): StopListenerCallback;
    listen<EventData extends EventDataMap>(channel: string, callback: HubCallback<string, EventData>, listenerName?: string): StopListenerCallback;
    private _toListeners;
}
export declare const Hub: HubClass;
/**
 * @internal
 *
 * Internal hub used for core Amplify functionality. Not intended for use outside of Amplify.
 *
 */
export declare const HubInternal: HubClass;