import { SafeStorage } from './safe-storage';
export declare const DEFAULT_BACKEND = "https://app.biel.ai";
export declare const LEGACY_CONVERSATION_KEY = "biel_conversation_data";
export declare function conversationBackend(apiUrl: string): string;
export declare function widgetInstance(element: HTMLElement, configuredId: string, generatedId: string): string;
export interface ConversationRecord {
    version: 1;
    backend: string;
    projectId: string;
    instance: string;
    url: string;
    chatId: string;
    expiry: number;
    restoreToken?: string;
}
interface StoreOptions {
    backend: string;
    project: string;
    instance: string;
    origin: string;
    claimLegacy?: () => boolean;
}
export declare class ConversationStore {
    private options;
    private storage;
    private now;
    readonly key: string;
    private legacyDisabled;
    constructor(options: StoreOptions, storage?: SafeStorage, now?: () => number);
    private validConversation;
    read(): ConversationRecord | null;
    private migrateLegacy;
    private record;
    save(chatId: string, expiryHours: number, restoreToken?: string): void;
    clear(): void;
}
export declare function claimLegacyConversation(document: Document, namespace: string): boolean;
export {};