import type { TAttributes, TUpdates } from "../../types/config";
export declare class UpdateQueue {
    private static instance;
    private updates;
    private debounceTimeout;
    private readonly DEBOUNCE_DELAY;
    private constructor();
    static getInstance(): UpdateQueue;
    updateUserId(userId: string): void;
    updateAttributes(attributes: TAttributes): Promise<void>;
    getUpdates(): TUpdates | null;
    clearUpdates(): void;
    isEmpty(): boolean;
    private handleLanguageWithoutUserId;
    private validateAttributesWithUserId;
    private sendUpdatesIfNeeded;
    processUpdates(): Promise<void>;
}
//# sourceMappingURL=update-queue.d.ts.map