import type { UploadType } from './types.js';
export default class RequestQueueHandler {
    private queue;
    private readonly callback;
    private pollEventBatchInterval?;
    static tearDownInvoked: boolean;
    static instance: RequestQueueHandler;
    private constructor();
    static getInstance(callback?: Function): RequestQueueHandler;
    add(event: UploadType): void;
    shutdown(): Promise<void>;
    startEventBatchPolling(): void;
    sendBatch(): Promise<void>;
    callCallback: (data: UploadType[], kind: string) => Promise<void>;
    resetEventBatchPolling(): void;
    removeEventBatchPolling(tag: string): void;
    shouldProceed(): boolean;
}
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