import { SubscribeEventDescriptor, PublishEventDescriptor, MessageListener, FFIFunctionCall, HermesOptions } from './types';
/**
 * An abstract Hermes API subset.
 */
export default class ApiSubset {
    protected call: FFIFunctionCall;
    destroy(): void;
    private listeners;
    private ffiCallbacks;
    protected options: HermesOptions;
    protected facade: Buffer | null;
    protected subscribeEvents: {
        [key: string]: SubscribeEventDescriptor;
    };
    publishEvents: {
        [key: string]: PublishEventDescriptor;
    };
    publishMessagesList: {
        [key: string]: any;
    };
    subscribeMessagesList: {
        [key: string]: any;
    };
    protected constructor(protocolHandler: Buffer, call: FFIFunctionCall, options: HermesOptions, facadeName: string);
    private makeSubscriptionCallback;
    /**
     * Subscribes a message listener to a given hermes event.
     *
     * @param eventName - The event name to subscribe to.
     * @param listener - A callback triggered when receiving a message.
     * @returns A reference to the listener.
     */
    on<T extends keyof this['subscribeMessagesList']>(eventName: T, listener: MessageListener<this['subscribeMessagesList'][T]>): MessageListener<this["subscribeMessagesList"][T]>;
    /**
     * Add a message listener that will only get called **once** for a given hermes event, then unsubscribe.
     *
     * @param eventName - The event name to subscribe to.
     * @param listener - A callback triggered when receiving a message.
     * @returns A reference to the wrapped listener.
     */
    once<T extends keyof this['subscribeMessagesList']>(eventName: T, listener: MessageListener<this['subscribeMessagesList'][T]>): (message: this["subscribeMessagesList"][T], ...args: any[]) => void;
    /**
     * Removes an existing message listener for a given hermes event.
     *
     * @param eventName - The event name that was subscribed to.
     * @param listener - A reference to the listener callback to remove.
     * @returns True if succeeded, false otherwise.
     */
    off<T extends keyof this['subscribeMessagesList']>(eventName: T, listener: MessageListener<this['subscribeMessagesList'][T]>): boolean;
    /**
     * Publish a message.
     *
     * @param eventName - Name of the publishing event.
     * @param message - Contents of the message.
     */
    publish<T extends keyof this['publishEvents']>(eventName: T, message?: this['publishMessagesList'][T]): void;
}