import { TabtalkMessage, TabtalkMessageMeta } from './tabtalkMessageFactory';
export declare type TabtalkMessageEventCallback = <T = any>(message: TabtalkMessage<T>) => void;
export declare type TabtalkMessageEventHandler = (event: CustomEvent) => void;
export declare class Tabtalk {
    private id;
    private TABTALK_MESSAGE_KEY_PREFIX;
    private TABTALK_MESSAGE_EVENT_NAME;
    private messageEventHandlersMap;
    private garbageCollectionDelay;
    constructor();
    /**
     * Permanently deactivates the Tabtalk instance by removing event handlers. Note that the event
     * handlers of instances of Tabtalk within the same browsing context will be affected as well.
     */
    destroy(): void;
    getId(): string;
    /**
     * Set the garbage collection delay. All messages that have existed for longer than this
     * delay will be considered due for garbage collection.
     * @param delay Time in milliseconds between creation and garbage collection.
     */
    setGarbageCollectionDelay(delay: number): void;
    /**
     * Adds a Tabtalk message event handler with the passed callback.
     */
    subscribe(callback: TabtalkMessageEventCallback): void;
    /**
     * Removes the Tabtalk message event handler that belongs to the passed callback.
     * If no callback is passed it will remove all the Tabtalk message event handlers.
     *
     * @param callbackToUnsubscribe (optional) The callback of the event listener to remove.
     */
    unsubscribe(callbackToUnsubscribe?: TabtalkMessageEventCallback): void;
    private unsubscribeAllEventHandlers;
    private createTabtalkMessageEventHandler;
    /**
     * Handles storage events that are caused by Tabtalk and transmits the serialized message if necessary.
     */
    private onStorageUpdate;
    /**
     * Deserializes a JSON string to a TabtalkMessage object.
     */
    private deserializeMessage;
    /**
     * Sends a message to all Tabtalk instances.
     */
    broadcast(body: any): void;
    /**
     * Sends a message to a specific Tabtalk instance.
     */
    sendMessage(recipientId: TabtalkMessageMeta['recipientId'], body: any): void;
    /**
     * Removes all Tabtalk messages from local storage that are due for garbage collection.
     */
    garbageCollect(): void;
    private getAllTabtalkMessageKeys;
    /**
     * Removes a Tabtalk message from the local storage.
     */
    private clearMessage;
    private generateMessageKey;
    private isTabtalkMessage;
    private isMessageAddressedToMe;
    private isMessageAddressedToEveryone;
    private isMessageBeingDeleted;
    private isMessageDueForGarbageCollection;
}