/**
 * On-disk friend metadata — local-only UI state that the Carrier friend store
 * doesn't hold (PRD-DESKTOP-UI §2.2): a local alias, a read cursor for unread
 * badges, pin/order, and when we added them.
 *
 * File: <configDir>/friends-meta.json  ->  { userid: FriendMeta }
 * Keyed by userid. Identity/accept-state still lives in the Carrier friend
 * store; this only augments it for display.
 */
export interface FriendMeta {
    userid: string;
    /** Local display name; falls back to the userid in the UI when absent. */
    alias?: string;
    pinned?: boolean;
    /** ts of the newest message the user has seen — drives unread counts. */
    lastReadTs?: number;
    addedAt: number;
}
export declare class FriendMetaStore {
    private path;
    private byUserid;
    private logger;
    private saveTimer?;
    private dirty;
    constructor(path: string);
    private load;
    get(userid: string): FriendMeta;
    /** Ensure an entry exists (first time we see a friend). */
    ensure(userid: string): FriendMeta;
    setAlias(userid: string, alias: string | undefined): void;
    markRead(userid: string, ts?: number): void;
    setPinned(userid: string, pinned: boolean): void;
    remove(userid: string): void;
    private scheduleSave;
    flush(): void;
}