export type NotifierCallback<TriggerArgs extends unknown[]> = {
    bivarianceHack(...args: TriggerArgs): void;
}['bivarianceHack'];
type NotifierTrigger<TriggerArgs extends unknown[]> = {
    bivarianceHack(...args: TriggerArgs): void;
}['bivarianceHack'];
export default class Notifier<TriggerArgs extends unknown[] = never[]> {
    listeners: Set<NotifierCallback<TriggerArgs>>;
    subscribe: (callback: NotifierCallback<TriggerArgs>) => (() => void);
    once: (callback: NotifierCallback<TriggerArgs>) => (() => void);
    isSubscribed: (callback: NotifierCallback<TriggerArgs>) => boolean;
    trigger: NotifierTrigger<TriggerArgs>;
}
export {};