import type { ArkmeArkoHistoryItem } from '../types.js';
export declare const ARKO_CONVERSATION_PREVIEW_FALLBACK = "\u5BF9\u8BDD\u5E76\u5904\u7406 Arkme \u4E1A\u52A1";
export interface ArkmeArkoPreviewCandidate {
    key: string;
    text: string;
    createdAtMillis?: number;
    messageId?: number;
}
export interface ArkmeArkoConversationPreviewSnapshot {
    revision: number;
    userId?: number;
    latestPreview?: string;
    latestAtMillis?: number;
    latestKey?: string;
    latestMessageId?: number;
}
export interface ArkmeArkoHistoryPreviewRequest {
    userId: number;
    requestId: number;
    surfaceRevision: number;
}
export declare function normalizeArkoConversationPreview(text: string): string;
export declare function latestArkoConversationPreview(candidates: readonly ArkmeArkoPreviewCandidate[]): ArkmeArkoPreviewCandidate | undefined;
export declare function latestArkoConversationPreviewInDisplayOrder(candidates: readonly ArkmeArkoPreviewCandidate[]): ArkmeArkoPreviewCandidate | undefined;
export declare class ArkmeArkoConversationPreviewStore {
    private snapshot;
    private readonly listeners;
    private nextHistoryRequestId;
    private latestHistoryRequestId;
    private surfaceRevision;
    readonly getSnapshot: () => ArkmeArkoConversationPreviewSnapshot;
    readonly subscribe: (listener: () => void) => (() => void);
    activateUser(userId: number | undefined): void;
    setLatestFromSurface(userId: number, candidates: readonly ArkmeArkoPreviewCandidate[]): void;
    beginHistoryRequest(userId: number): ArkmeArkoHistoryPreviewRequest | undefined;
    setLatestFromHistory(request: ArkmeArkoHistoryPreviewRequest, items: readonly ArkmeArkoHistoryItem[]): boolean;
    private publishLatest;
    private publish;
}
export declare const arkmeArkoConversationPreviewStore: ArkmeArkoConversationPreviewStore;
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