/**
 * The base class for classes that hold a set of functions to be called in response
 * to an event or change in value, e.g. Observable and Event.
 */
export declare class Emitter<Args extends Array<any> = []> {
    protected _funcs: [fn: (...args: Args) => void, priority: number][];
    private _emitting;
    private _toUnbind;
    private _needsSort;
    private _next;
    private _nextFn;
    /**
     * Clears all listeners from the event.
     */
    clearListeners(): void;
    /**
     * Add a new handler function
     * @param f - The callback function to be bound.
     */
    addListener(f: (...args: Args) => void, priority?: number): void;
    /**
     * Unbind an existing function
     * @param f - The callback function to be unbound.
     */
    removeListener(f: (...args: Args) => void): void;
    /**
     * Returns a promise that will be resolved the next time this object emits.
     */
    get next(): Promise<Args>;
    /**
     * Emit an event
     *
     * @param a - The argument to pass to handler functions.
     */
    protected _emit(...args: Args): void;
}