export type SequenceListener<T> = (value: T, next: (args?: {
    signal?: AbortSignal;
}) => Promise<T>) => any;
/**
 * Sequencer is a reduced form of an event listener, which allows listeners to be run
 * when a `notify()` call is made, but which provides a way for those listeners to internally get
 * future events.
 *
 * It does not support `removeListener`, rather, pass a {@link AbortSignal}.
 */
export type Sequencer<T> = {
    addListener: (fn: SequenceListener<T>, args?: {
        signal?: AbortSignal;
        once?: boolean;
    }) => void;
    notify(value: T): void;
};
/**
 * Builds a sequencer. This can be spread onto another object as it does not use `this`.
 */
export declare function buildSequencer<T>(): Sequencer<T>;