import type { OtherPresence } from "./presence.js";
export interface ViewportDescriptor {
    fileId?: string;
    scrollX?: number;
    scrollY?: number;
    zoom?: number;
    cursorX?: number;
    cursorY?: number;
}
export interface UseFollowUserOptions {
    others: OtherPresence[];
    followingId: number | null | undefined;
    viewportKey?: string;
    onViewport: (viewport: ViewportDescriptor) => void;
}
export interface UseFollowUserResult {
    followingId: number | null;
    isFollowing: boolean;
    stopFollowing: () => void;
}
export declare function useFollowUser({ others, followingId, viewportKey, onViewport, }: UseFollowUserOptions): UseFollowUserResult;