import { NotifierCallback } from './Notifier';
type ChannelNotifierTrigger<TriggerArgs extends unknown[]> = {
    bivarianceHack(channel: string | undefined, ...args: TriggerArgs): void;
}['bivarianceHack'];
export default class ChannelNotifier<TriggerArgs extends unknown[] = never[]> {
    private channels;
    subscribe: (channel: string, callback: NotifierCallback<TriggerArgs>) => (() => void);
    once: (channel: string, callback: NotifierCallback<TriggerArgs>) => (() => void);
    isSubscribed: (channel: string, callback: NotifierCallback<TriggerArgs>) => boolean;
    trigger: ChannelNotifierTrigger<TriggerArgs>;
}
export {};