import type { Channel } from 'stream-chat';
export type UseChannelHeaderOnlineStatusParams = {
    channel?: Channel;
    watcherCount?: number;
};
/**
 * Returns the channel header online status text (e.g. "Online", "Offline", or "X members, Y online").
 * Returns null when the channel has no members (nothing to show).
 */
export declare function useChannelHeaderOnlineStatus({ channel: channelOverride, watcherCount: watcherCountOverride, }?: UseChannelHeaderOnlineStatusParams): string | null;
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