import { SdError } from "../errors/SdError";
import EventEmitter from "events";
export declare class SdAsyncFnDebounceQueue extends EventEmitter {
    private readonly _delay?;
    private _pendingFn;
    private _isRunning;
    private _timer;
    on(event: "error", listener: (err: SdError) => void): this;
    constructor(_delay?: number | undefined);
    run(fn: () => void | Promise<void>): void;
    private _processLast;
}