/**
 * relatively simple event publish/subscribe mechanism.
 * not as simple as it used to be.
 *
 * UPDATE removing unecessary interface (not sure what that
 * was for, but no one else is using it).
 */
export declare class EventSource<T> {
    private verbose;
    private log_id?;
    /** pending events */
    private queue;
    /** flag indicating whether we have already triggered a callback */
    private dispatched;
    /** regular subscriptions */
    private subscribers;
    constructor(verbose?: boolean, log_id?: string | undefined);
    /**
     * FIXME: does anybody call this with an array? it's no longer
     * necessary for multiple messages to prevent extra callbacks...
     */
    Publish(event: T | T[]): void;
    /**
     * subscription returns a token which can be used to cancel subscription.
     * this token is a number, guaranteed to be !0 so you can test for falsy.
     */
    Subscribe(subscriber: (event: T) => void): number;
    /** cancel a single subscription */
    Cancel(token: number): void;
    /**
     * cancel all subscriptions AND ALL PASS-THROUGH SOURCES.
     */
    CancelAll(): void;
}