export interface ExportRecord<M> {
    token: string;
    fileName: string;
    meta: M;
    reused: boolean;
    expiresAt: string;
}
declare class ExportDownloadStore {
    private readonly byToken;
    private readonly byUser;
    private prune;
    /**
     * Returns the caller's existing unexpired export when one exists (the 24h
     * rate limit) without invoking `build`. Otherwise builds and stores a new
     * one. `userId` empty string means "no rate limiting" (unauthenticated
     * callers each get their own token, never reused).
     */
    getOrCreate<M>(userId: string, build: () => Promise<{
        buffer: Buffer;
        fileName: string;
        meta: M;
    }>): Promise<ExportRecord<M>>;
    get(token: string): {
        buffer: Buffer;
        fileName: string;
    } | undefined;
}
export declare const exportDownloadStore: ExportDownloadStore;
export {};
//# sourceMappingURL=exportDownloadStore.d.ts.map